Power Dissipation Efficiency Research Articles

Research progress on microstructure evolution and hot processing maps of high strength β titanium alloys during hot deformation

High strength β titanium alloys are widely used in large load bearing components in the aerospace field. At present, large parts are generally formed by die forging. Different initial microstructures and deformation process parameters will significantly affect the flow behavior. To precisely control the microstructures, researchers have conducted many studies to analyze the microstructure evolution law and deformation mechanism during hot compression. This review focuses on the microstructure evolution of high strength β titanium alloys during hot deformation, including dynamic recrystallization and dynamic recovery in the single-phase region and the dynamic evolution of the α phase in the two-phase region. Furthermore, the optimal hot processing regions, instability regions, and the relationship between the efficiency of power dissipation and the deformation mechanism in the hot processing map are summarized. Finally, the problems and development direction of using hot processing maps to optimize process parameters are also emphasized.

Hot deformation characteristics and dynamic recrystallization of biomedical CoCrWCu alloy

In order to explore the dynamic recrystallization of biomedical CoCrW-2Cu alloy, the hot deformation behavior was investigated by isothermal compression tests. True stress-true strain curves showed that the true stress increased with increasing strain rate or decreasing deformation temperature. Meanwhile, obvious dynamic softening was observed. The constitutive equation and processing maps were constructed to elucidate the relationship between true stress and deformation parameter. The phase component and microstructure were investigated to reveal the relationship between microstructure evolution and deformation condition, which was beneficial to the optimization of the hot deformation parameter. The variation of deformation condition has a limited influence on the phase component. The strain rate has a significant influence on the extent of recrystallization. An obviously discontinuous dynamic recrystallization (DDRX) process was occurred in this study. Furthermore, the extent of dynamic recrystallization (DRX) of sample deformed at 1100 °C/0.01 s -1 was the highest. Negative value of efficiency of power dissipation could be found in the top left corner of processing maps, while high value of efficiency of power dissipation was observed in the region with high temperature and low strain rate. The processing maps predicted that the optimized deformation parameters were 1100~1150 °C and 0.01~0.1 s -1 .

Characterization of Hot Workability in AISI 4340 Based on a 3D Processing Map

This study performed high-temperature compression tests at the temperature 900 to 1200 °C and strain rate 0.01 to 10 s−1 to characterize the high-temperature deformation behavior of AISI 4340. The constitutive equation of AISI 4340 was expressed using the Arrhenius model and the Zener–Hollomon (Z) parameter. Dynamic Recrystallization (DRX) behavior was evaluated by observing the compressed specimen with Electron Backscatter Diffraction (EBSD). The processing map is based on the dissipation efficiency of the dynamic material model (DMM) and the plastic instability criterion of Ziegler. At strain 0.4, the power dissipation efficiency value is 0.5 or more, and the instable zones are immediately identified through the processing map. The strain, strain rate and temperature data obtained from the FEM simulation of the hot forging process are displayed on the proposed 3D processing map to avoid the flow instability zones and ensure high power dissipation efficiency zones, allowing the operator to control the process’s temperature and speed.

Hot deformation behavior of a novel alpha + beta titanium alloy TIMETAL®407

The hot deformation behavior of a newly developed α + β titanium alloy TIMETAL®407 (Ti407) was characterized in starting transformed-β microstructure at different temperatures (T = 650–950 °C) and strain rates (ε̇ = 10−3 - 1 s−1) using hot-compression testing. The Arrhenius type constitutive equations are developed for Ti407 and the activation energy for deformation is determined as 333.1 and 179.8 kJ/mol in the α and β dominated phases, respectively. The processing and strain-rate sensitivity maps of Ti407 were generated at true strain, ε = 0.5 on the basis of modified dynamic materials model (DMM) proposed by Murty and Rao. Results obtained from the maps and microstructural analysis of the deformed specimens indicates three distinct stable domains (I-A, II-A and I-B) within the examined conditions. Out of the three stable domains, Domain I-A occurring in the α + β phase field (T = 800–860 °C and ε̇= 6.3 ×10−2 - 1 s−1) and Domain I-B in the β phase field (T = 900–950 °C and ε̇= 10−3 - 1 s−1) were optimum domains for possible hot working of Ti407. The peak in the efficiency of power dissipation of about 58% occurred in Domain I-A at 850 °C/1 s−1, where dynamic spherodization of α lamellae occurred. In Domain I-B, formation of fine dynamically recrystallized β grains was observed with peak in power dissipation efficiency of about 60% at 950 °C/10−3 s−1. Ti407 showed evidence of flow instabilities like flow localization and kinking of α lamellae in the predicted unstable zones identified from the processing map. The hot workability of Ti407 on the basis of expanding or shrinking stable regimes for processing is also compared with CP-Ti and Ti-6Al-4V alloys at identical strain rates and temperatures relative to the beta-transus. Finite element method (FEM) software DEFORM®− 3D was used for forging simulation at the peak in deformation efficiency condition in various stable domains to evaluate the flow response and distributions of stress/strain in the forged billets.

Performance of radiation hard 3D pixel sensors for the upgrade of the ATLAS Inner Tracker

The Inner Detector of the ATLAS experiment at CERN will be replaced by a completely new Inner Tracker (ITk) to exploit the performance of the High Luminosity upgrade of the LHC accelerator (HL-LHC). The new detector will have to operate in an unprecedented radiation environment. In particular, the hybrid pixel detectors of the innermost layer of the ITk will be exposed to a particle fluence of about 1.7 × 1016 neq/cm2 before being replaced. A novel 3D pixel sensor technology featuring thin active substrates and small pixel cells has been selected to instrument the innermost barrel layer and rings of the ATLAS ITk. Prototypes of 3D pixel sensors produced at CNM in Barcelona, Spain, including 3D pixelated test structures as well as half-size sensors coupled to the RD53A ASIC prototype for HL-LHC, have been irradiated with protons and neutrons up to the radiation doses expected for the innermost layers of ITk. Their performance in terms of leakage current, power dissipation and hit efficiency of different pixel geometries after irradiation have been investigated and compared to the requirements for ITk.

A New ANN-Based Controller with Variable Frequency for a 12-Switches Cascaded Modified Packed U-Cell Inverter

This study describes the results of combining two Modified Packed Ucell (MPUC) inverters to construct a cascaded MPUC network. With only 12 switching combinations, this topology can create up to 49 levels of voltages. The voltages of two MPUCs are adjusted such that each auxiliary source has one-third of the voltage level of the primary source and the primary source voltage level of the MPUC is one-seventh of the value of the DC voltage of the cascaded unit. The formation of different voltage levels by cascading is presented in detailed manner. An Artificial Neural Network (ANN) trained for harmonic removal in the output voltage waveform is used to control this converter. ANN is trained on two different frequency switching schemes. The cascaded unit with high voltage stress (14VDC) is switched at low frequency, low switching frequency operation of the MPUC, results in decreased power dissipation and higher system efficiency, and the multilayer output voltage waveform is virtually sinusoidal with negligible Total Harmonic Distortion (THD) content (less than 2%). The presented inverter and its ANN based control method result in a design trade-off between filter size and switching frequency (efficiency). This is predominantly helpful for high power applications, such as HVDC transmission system. The simulation realized for converter and its control in MATLAB®/Simulink environment show good agreement with theoretical values.

Complex dynamic restoration processes leading to a high degree of deformability in a dual-phase Al0.5CoCrFeNi high entropy alloy

The current research provides scientific evidence based on experimental and modeling approaches that complex softening processes characterized by dynamic recovery (DRV) and dynamic recrystallization (DRX) combined with twinning contribute efficiently to the hot deformation processing of the Al 0.5 CoCrFeNi alloy. An as-cast face-centered-cubic (fcc) oriented Al 0.5 CoCrFeNi dual-phase high entropy alloy, HEA, was deformed in uniaxial compression to a true strain 0.8 at temperatures between 900 and 1100 ºC and strain rates from 0.0013 to 0.1 s −1 . A dynamic material model was applied to predict the processing windows, and the underlying deformation mechanisms were characterized using scanning electron microscopy and electron backscattered diffraction. The optimum processing window for the studied alloy is at 900–960 ºC/ 0.0013–0.002 s −1 , where the efficiency of power dissipation and strain rate sensitivity ranges from 45% to 50% and 0.28–0.33, respectively. The processing map also exhibits a domain of flow instability located in the lower temperature and higher strain rate regions, resulting mainly from flow localization. The studied alloy represents a dual-phase fcc + bcc/B2 microstructure in an as-cast (undeformed) state. The fcc matrix occupying 94 vol% forms dendrites with an average diameter of 210 µm, decorated by discrete networks of bcc/B2 phase of average grain size 3.5 µm residing in interdendritic regions. The microstructural analyses corroborate the coincidence of DRX and twinning in the fcc phase in all deformed specimens. However, only DRV takes place within the bcc phase. The current study reveals a well-suited parameter range to achieve a high degree of hot deformability in dual-phase HEAs by taking advantage of twinning combined DRX to refine the microstructure significantly. Future work will have to identify possible application cases. • The possibility of hot deformation processing of a duplex fcc+bcc Al 0.5 CoCrFeNi alloy. • Complex dynamic restoration processes lead to a high degree of hot workability. • The optimum processing window locates at 900–960 ºC/ 0.0013–0.002 s −1 . • Shear localization yields flow instability in lower temperature and higher strain rate regions.

Deformation behavior and processing map of ATI 425 with initial lamellar microstructure

The effect of hot compression temperatures and strain rates on deformation behavior and resultant microstructure of ATI 425 alloy with initial lamellar microstructure was investigated in this study. The temperature and strain rate of the hot compression test were chosen to be in the 700-1100 °C and 0.001-1 s-1 ranges, respectively. The stress-strain curve and microstructure evaluation show that the alloy's flow softening is associated with globularization and dynamic recrystallization mechanisms. The constitutive equation calculates the activation energy for the α/β and β regions to be 348 kJ/mol and 201 kJ/mol, respectively. Dynamic recovery and partial recrystallization are the dominant structure modification mechanisms in the beta single-phase region. Bending and fragmentation of alpha plates is the dominant mechanism of microstructure promotion in the α/β region at low temperatures and low strain rates, less than 0.1s-1. Local shear and alpha plate break-up are the main factors in structural modification at high strain rates, greater than 0.1s-1. The extracted process map at 0.5 strain revealed three zones: instability, safe zone, and peak zone, with power dissipation efficiencies of 0 -0.25%, 30-40%, and above 40%.

Hot Compression Deformation Behavior and Microstructure of As-Cast and Homogenized AA2195 Al-Li Alloy

To understand the effect of the initial state of AA2195 Al-Li alloy on the forming process, as-cast and homogenized ingots were compressed by using a Gleeble-3150 thermo-mechanical simulator at different temperatures (360–480 °C) and strain rates (0.01–10 s−1). The hot compression deformation behaviors and microstructural characteristics of the two types of ingots were systematically investigated. The as-cast alloy possessed a better hot compressibility with higher power dissipation efficiency and lower rheological stress than the homogenized alloy under the same deformation conditions. When the temperature was increased above 450 °C, all the alloys showed similar rheological curves. Based on the rheological stress curves, processing maps for the as-cast (AC) and homogenized (HG) alloys were established, and optimal processing domains were identified. In addition, the homogenized alloys were dominated by a fibrous microstructure during deformation, whereas the as-cast alloy produced fine crystals at low temperature (360 °C) and equiaxed crystals at high temperature (480 °C). Our results show that it is possible to use the as-cast 2195 Al-Li alloy as the initial billet to get complicated components. This is attributed to the dispersed eutectic phases, which can provide more nucleation sites for Dynamic Recrystallization (DRX) and Dynamic Recovery (DRV) during hot deformation.

Enhanced viscous glide creep in disordered β (Cu17Sn13) intermetallic phase with coarse grains

High-temperature deformation mechanisms and processing maps of the coarse-grained A2 (disordered BCC) β (Cu17Sn13) intermetallic phase alloy (with the chemical composition of Cu-24.6 wt %Sn) were examined in compression in the temperature range of 843–993 K and strain rate range of 10−3-10 s−1. The β phase exhibited a stress exponent (n1) of nearly 3 over almost the entire strain-rate range at these temperatures. Limited subgrain formation occurred during hot compression. This microstructural feature and the observation of n1 = 3 strongly suggest that solute drag creep is the main high-temperature deformation mechanism. A comparison of the high-temperature deformation mechanisms and behaviors of the BCC β phase and FCC α-solid solution phase (with the composition of Cu–10Sn alloy studied in previous work) shows that both β and α phases exhibit solute drag creep, but β is considerably weaker in strength, and the upper limit of strain rate for solute drag creep is much higher (over 100 times). Solute drag creep at high strain rates in the β phase can be attributed to the high breakaway stresses for dislocations from the solute atmosphere in the presence of a high concentration of Sn solutes in the matrix. The β phase exhibits superior hot workability compared with the α phase according to the processing maps, especially at high strain rates. This is because there is no flow instability regime for the β phase under the investigated testing conditions and the power dissipation efficiency at high strain rates is higher in the β phase compared with the α phase.

Understanding processing map and microstructural evolution of powder metallurgy Ti-6Al-4V within a wide range of deformation temperatures

The hot deformation behavior and microstructural evolution of powder metallurgy (PM) Ti-6Al-4V are investigated using the Arrhenius constitutive model, hot processing map, microstructure observation, and hot deformation mechanism analysis. The optimal processing parameters obtained from the hot processing map are 1323–1423 K at 0.1–1 s−1, and 1423–1523 K at 1–10 s−1. Hot deformation in β region is attractive for PM Ti-6Al-4V. The dominant hot deformation mechanism of PM Ti-6Al-4V is dynamic recrystallization (DRX) in the (α + β) and β regions. Continuous dynamic recrystallization (CDRX) is the dominant mechanism in the (α + β) region. The combination of CDRX and discontinuous dynamic recrystallization (DDRX) is the preferred mechanism in the β region. The power-dissipation efficiency is affected by DRX, which consumes dislocations and refines the microstructure. Specific hot working parameters for thermomechanical processing (TMP) of PM Ti-6Al-4V are identified.

3D 변형 공정 지도 기반 AISI 4340 소재의 열간 단조 온도 및 변형률 속도 제어

This paper investigated the hot deformation behavior of an AISI 4340 material through high-temperature compression experiments. The compression tests were performed to obtain stress-strain curves at processing temperatures of 900, 1,000, 1,100, and 1,200℃, and the strain rates of 0.01, 0.1, 1, and 10 sSUP-1/SUP up to a true strain of 1.0 in the high-temperature compression mode of GleebleSUP®/SUP 3,500. A novel 3D processing map, constructed through power dissipation efficiency and Ziegler

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

This study presents the characteristics of hot deformation behavior of a Al0.3CoCrFeNi high–entropy alloy in the temperature and strain rate ranges of 1023–1423 K and 10–3–10 s–1, respectively. The constitutive flow behavior was modeled based on the hyperbolic–sinusoidal Arrhenius–type equations and a mathematical relation was used to observe the influence of true strain on material constants. To define the hot workability of the alloy, a processing map was developed based on the principles of the dynamic materials model. Accordingly, a dynamic recrystallization (DRX) domain was identified as prudent for processing in the temperature and strain rate ranges of 1273–1423 K and 10–2–2 × 10–1 s–1 respectively, with a peak efficiency of ~45% at 1423 K/6 × 10–2 s–1. At lower temperatures (1048–1148 K) and strain rates (10–3–3 × 10–3 s–1), a dynamic recovery (DRV) domain was identified with a peak efficiency of 38% at 1123 K/10–3 s–1. A large instability regime occurred above 3 × 10–1 s–1 with an increased tendency of adiabatic shear bands. It extended to lower strain rates 10–2–10−1 s−1 at temperatures< 1123 K, manifested by localized shear bands and grain boundary cracking. At low strain rates (5 × 10–3–10–3 s–1) and temperatures (1148–1298 K), particle stimulated nucleation of new DRX grains occurred at B2 precipitates, though the efficiency of power dissipation dropped sharply to ∼9%.

Hot deformation behavior and microstructure evolution of Inconel 625 superalloy sheet

The hot deformation behavior and microstructural evolution of Inconel 625 superalloy sheet under different conditions were investigated. The hot tensile tests under the temperature ranging from 800 ℃ to 950 ℃ with the increment of 50 ℃ and the strain rates between 0.001 and 0.1 s−1 were performed on a Gleeble 3500 machine. The experimental results indicated that the plastic flow behavior of the Inconel 625 sheet changes from work hardening to hot softening with the rise of experimental temperature and the decline of strain rate. Furthermore, the elongation is decreased with the rise of deformation temperature and decline of strain rate. According to the principle of dynamic material model (DMM), the process maps at various strains were constructed, and the optimal domain with the highest power dissipation was determined. The optimal domain appears at the temperature range of 925 and 950 ℃ and the strain rate between 0.001 and 0.1 s−1 with the power dissipation efficiency of about 46.5%. The grain size, grain boundary and texture of the deformed samples under typical conditions was analyzed by electron backscatter diffraction (EBSD) and transmission electron microscope (TEM), which reflected that the dynamic recrystallization (DRX) occurs in the optimal hot working window, and the preferred orientation for DRX nucleation of the Inconel 625 superalloy sheet is the<001>direction. The deformation behavior of Inconel 625 sheet under the long-term service temperature range is affected by the coupled effect of DDRX and CDRX.

Characterization of Hot Deformation of near Alpha Titanium Alloy Prepared by TiH2-Based Powder Metallurgy.

TiH2-basd powder metallurgy (PM) is one of the effective ways to prepared high temperature titanium alloy. To study the thermomechanical behavior of near-α titanium alloy and proper design of hot forming, isothermal compression test of TiH2-based PM near-α type Ti-5.05Al-3.69Zr-1.96Sn-0.32Mo-0.29Si (Ti-1100) alloy was performed at temperatures of 1123–1323 K, strain rates of 0.01-1 s−1, and maximum deformation degree of 60%. The hot deformation characteristics of alloy were analyzed by strain hardening exponent (n), strain rate sensitivity (m), and processing map, along with microstructure observation. The flow stress revealed that the difference in softening/hardening behavior at temperature of 1273–1323 K and the strain rate of 1 s−1 compared to the lower deformation temperature and strain rate. The strain hardening exponents at temperatures of 1123 K are all negative under all strain rates, and the most severe flow softening with minimum value of n was observed at 1123 K and 1 s−1. The strain rate sensitives showed that the peak region with m value greater than 0.5 generally appeared in the high temperature range of 1273–1323 K, while strain rate sensitivity at low temperature behaved differently with strain rates. The processing map developed for strain of 0.6 exhibited high power dissipation efficiency at high temperatures of 1273–1323 K and a low strain rate of 0.01 s−1, due to microstructure evolution of β phase. The decrease of strain rate at 1323 K resulted in the formation of globularization of α lamellae. The instability domain of flow behavior was identified in the temperature range of 1123–1173 K and at the strain rate higher than 0.01 s−1 reflecting the localized plastic flow and adiabatic shear banding, and inhomogenous microstructure. The variation of power dissipation energy (η) slope with strain demonstrated that the power dissipation mechanism during hot deformation has been changed from temperature-dependent to microstructure-dependent with the increase of temperature for the alloy deformed at 0.1 s−1. Eventually, the optimum processing range to deform the material is at 1273–1323 K and a strain rate range of 0.01–0.165 s−1 (ln = −4.6–−1.8).

Hot deformation behaviour of Ti alloys: A review on physical simulation and deformation mechanisms

Titanium and its alloys, owing to their properties like high strength, toughness, corrosion resistance and thermal stability, are employable in various engineering and medical applications. The properties of titanium alloys depend upon the processing routes and their final microstructure. Therefore, the present review paper compiles the deformation behaviour of various alloys during hot deformation using a physical simulation. Subsequently, the flow stresses are analysed and utilized to develop the processing maps and the constitutive equations that are advantageous for predicting deformation mechanisms during the hot deformation. Specific features reported in the flow stress curves include work hardening, flow softening and steady-state behaviour. In certain cases, the yield point drop and oscillatory behaviour or serrations are also observed. Softening and oscillatory behaviour is an indicator of either dynamic recrystallization or flow-instability, whereas yield discontinuity signifies locking and unlocking of dislocations. In the processing maps, high power dissipation efficiency, η, reveals safe processing conditions, and the η value higher than 40% demonstrates dynamic recrystallization or globularization in the deformed microstructure, whereas the instability domain expresses shear band, flow localization, void formation and wedge cracks in the deformed microstructure. Amongst all the constitutive equations, the Arrhenius-type hyperbolic sine equation is the most suitable for Ti alloys for calculating flow stress and predicting dominant deformation mechanism using activation energy Q and stress exponent n.

Hot Deformation Behavior and 3D Processing Maps of Mn18Cr18N Steel

The isothermal hot deformation behavior in the ranges of 1023–1473 K (750–1200 °C) and 0.001–10 s−1 for 0.53 wt% N‐bearing Mn18Cr18N steel is studied with a Gleeble‐3500 thermomechanical simulator. The results indicate that the peak stress decreases with decreasing strain rate and increasing temperature. The calculated deformation activation energy of the experimental steel is 449.118 kJ mol−1 by regression analysis. At the same time, 3D processing maps are established based on experimental data and the principles of the dynamic materials model. The domain of stable deformation gradually expands with the increase in strain, while the instability region shrinks accordingly. From the microstructure of specimens and the processing maps established, it is clear that dynamic recrystallization emerges in the peak power dissipation efficiency domain, 1000–1150 °C/0.002–0.1 s−1, which is the optimum region of hot working of the steel.

Study on microstructure evolution and deformation mechanism of Ti-6554 based on power dissipation efficiency at supertransus temperatures

The microstructure evolution and deformation mechanism of a Ti-6Cr-5Mo-5 V-4Al (Ti-6554) alloy during high temperature compression is investigated based on the power dissipation efficiency (η). It is found that raising the temperature and decreasing the strain rate can promote the DRX process. Two types of DRX are found: discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX). Furthermore, combined with the change of η in the whole strain range and the peak η under different conditions, this study links η with the corresponding deformation mechanism of Ti-6554 alloy. It can be summarized as follows: the corresponding efficiency value of the DDRX process needs to exceed 0.45; the occurrence of CDRX requires that the η value is higher than 0.3. Dynamic recovery (DRV) becomes dominant when the η value is less than 0.3. Some typical instability phenomena appear when the η value is less than 0.2. This study can provide an effective means to determine the deformation mechanism of the Ti-6554 alloy.

Hot deformation behaviors of AZ91 magnesium alloy: Constitutive equation, ANN-based prediction, processing map and microstructure evolution

The hot deformation behavior in an AZ91 magnesium alloy was studied using Arrhenius model and Back-Propagation Artificial Neural Network (BP-ANN) approaches. The hot compression tests of AZ91 alloy were performed on the MMS-300 simulator at deformation temperatures and strain rates in the range of 473–623 K and 0.001 s −1 - 1 s −1 , respectively. The results indicated that the BP-ANN model has higher accuracy than Arrhenius model and the correlation coefficient is as high as 0.99341. The processing map is divided into three parts: machinable area (A), instability area I (INS I) (B) and instability area II (INS II) (C). The instability mode of areas B and C gradually changes from cracks to holes with the increase of temperature or the decrease of strain rate. The stable hot-deformation conditions with peak efficiency of power dissipation were concentrated in the range of 523 K, 0.01 s −1 , 573 K, 0.01 s −1 , 623 K, 0.001–1 s −1 , respectively. With the increase of temperature, the deformation mechanism changed from twinning to dynamic recrystallization (DRX), which is discontinuous dynamic recrystallization (DDRX). Due to DRX,< 0001 > // CD texture intensity increased with the increase of temperature, and then decreased. ● BP-ANN is used to predict stress and strain. ● Instability mode: crack and hole. ● Deformation mechanism: twinning, slip and DRX.

An investigation of constitutive modeling and 3D processing maps of Mg/HA composites for orthopedic applications

The hydroxyapatite particles as reinforcement materials have been widely considered to produce magnesium biocomposites used in biodegradable implants. However, Mg/HA biocomposites, which show poor ductility at room temperature due to their intrinsic properties, must be deformed at elevated temperatures. Thus, optimum hot deformation conditions of Mg/HA biocomposites can improve the corrosion behavior of these materials in addition to their mechanical and microstructural properties. In the present study, the high-temperature deformation behavior of Mg/1wt.% HA and Mg/2.5 wt.% HA biocomposites have been scrutinized using compression tests in the temperature ranges of 523–673 K and strain rates between 0.005 and 0.1 s−1. The true stress-true strain diagrams, constitutive analysis, 3D processing map for power dissipation efficiency and instability in the strains from 0.1 to 0.6, and microstructural observations were assessed for both biocomposites. The results indicated that the proposed constitutive model could predict the Mg/HA biocomposites’ high-temperature deformation behavior with adequate accuracy. The activation energy which obtained from constitutive equations for both Mg/1wt.% HA and Mg/2.5wt.% HA biocomposites were identified to be 256.302 Kj/mol and 224.798 Kj/mol, respectively. According to 3D processing maps, the highest value of power dissipation efficiency for Mg/1wt.% HA has occurred in the strain of 0.2, strain rate of 0.005 s−1, and temperature of 573 K; however, for Mg/2.5wt.% HA, it has located at the strain, temperature, and strain rate of 0.3, 530 K, and 0.09 s−1, respectively. The microstructural characterizations showed more dynamic recrystallization occurrence in Mg/2.5wt.% HA than the Mg/1wt.% HA biocomposite.