Cold Pressing Sintering Research Articles

Tattoo-inspired surface texturing on oil-impregnated PTFE for advanced tribological properties

PurposeThis paper aims to investigate the crucial roles of textured surfaces on oil-impregnated polytetrafluoroethylene (PTFE) created by a facile tattoo strategy in improving tribological properties.Design/methodology/approachPored PTFE (PPTFE) was prepared by mixing powder PTFE and citric acid and experienced a cold-press sintering molding process. Subsequently, textured surfaces were obtained with using a tattoo strategy. Surface-textured PPTFE was thus impregnated with polyethylene glycol 200, yielding oil-impregnated and pore-connected PPTFE.FindingsThis study found that oil-impregnated and surface-textured PPTFE exhibited excellent tribological performances with an 82% reduction in coefficient of friction and a 72.5% lowering in wear rate comparing to PPTFE.Originality/valueThis study shows an efficient strategy to improve the tribological property of PTFE using a tattoo-inspired surface texturing method.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2024-0378/

Synergistic enhancement of Cu2Se thermoelectric properties via Te and S co-doping: aqueous synthesis and cold-press sintering for power generation

Materials including Cu2Se, Cu2Se0.96−xSxTe0.04 (x = 0.00–0.03) and Cu2−ySe0.94S0.02Te0.04 (y = 0.00–0.04) were synthesized using aqueous solution processing at room temperature and cold-press sintered under vacuum at 650 °C for 6 hours.

Mechanical and CMAS resistance properties of Al2O3 modified Yb2Si2O7 ceramics

Enhancing the resistance of environmental barrier coating materials to molten silicate corrosion is crucial for improving the service reliability of such coatings. This study investigates modified Yb2Si2O7 ceramic bulk materials containing varying mass fractions of Al2O3 through doping Yb2Si2O7 with Al2O3. Results indicate that Al2O3 doping effectively reduces porosity of Yb2Si2O7 and enhances the mechanical properties of the material, including its hardness and fracture toughness. X-Ray diffractometer results indicate that after cold-press sintering, Al2O3 transforms into Yb3Al5O12 and consumes Yb2SiO5. Corrosion tests conducted at 1300 °C revealed that the Al2O3-modified samples exhibit superior resistance to CMAS corrosion. This improvement is attributed to the increased density of the samples resulting from Al2O3 doping, which inhibits direct CMAS infiltration into the material and facilitates the formation of a protective apatite barrier layer on the surface. Furthermore, the presence of Al2O3 influences the concentration of Yb2SiO5 in the samples, leading to increase the porosity within the apatite layer, and resulting in a thicker reaction layer.

Enhancement of corrosion, biocompatibility and drug delivery properties of nitinol implants surface by Al-Zn-LDH nanohybrids

This study investigates the enhancement of drug delivery and corrosion resistance by incorporating dexamethasone sodium phosphate into aluminum-zinc layered double hydroxide (LDH) coated nickel-titanium alloys. The nickel-titanium samples were fabricated from titanium and nickel powders using spark plasma sintering (SPS) and cold press sintering (CPS), followed by electrophoretic deposition of LDH nanoparticles. This composite construction aims to utilize the biocompatibility and mechanical properties of nickel-titanium, combined with the controlled drug release and corrosion resistance properties of LDH coatings. Structural and microstructural characterizations were performed using X-ray diffraction and scanning electron microscopy. The results indicated that SPS samples exhibited superior microstructural homogeneity and corrosion resistance compared to CPS samples. Dexamethasone sodium phosphate was successfully intercalated into the LDH layers, as evidenced by an increase in layer spacing from 7.14 Å to 20.130 Å. The LDH-coated nickel-titanium with intercalated dexamethasone sodium phosphate demonstrated a 5 % lower drug release rate and significantly improved corrosion resistance compared to uncoated samples. Cell adhesion studies confirmed good biocompatibility between cells and the coated surface. This composite material shows promise for enhanced performance in biomedical applications, particularly in drug delivery and corrosion resistance.

Corrosion behavior of Gd2Hf2O7 ceramic exposed to Calcium-Ferrum-Alumina-Silicate (CFAS) melt at 1673 K

A Gd2Hf2O7 ceramic with pyrochlore structure has been prepared by the sol-gel and cold-pressing sintering, the corrosion behavior and mechanism of CFAS powder (33CaO:10FeO1.5:13AlO1.5:44SiO2) on the Gd2Hf2O7 ceramic at 1673 K was investigated. Results showed that the average grain size of Gd2Hf2O7 ceramic was 3.37 μm. The CFAS melt rapidly flowed and diffused into the interior of Gd2Hf2O7 ceramics and reacted with Gd2Hf2O7 to generate high melting point rod-shaped Ca2Gd8(SiO4)6O2 apatite and Hf-Gd oxides, which can effectively hinder further flow and diffusion of CFAS melt, resulting in a slow increased in corrosion depth with corrosion time. The penetration depth of the Gd2Hf2O7 ceramic wafer after 30 h of CFAS corrosion at 1673 K was only 337.7 μm, showing excellent resistance to CFAS corrosion at high temperatures.

Powder Metallurgical Processing of Al–5 wt% Cu Matrix Composites Reinforced with MoSi2 and WSi2 Particulates

Herein, investigations on the microstructural, physical, and mechanical properties of molybdenum disilicide (MoSi2)‐ and tungsten disilicide (WSi2)‐reinforced aluminum (Al)–copper (Cu) matrix composites are reported. Powder metallurgy methods such as mechanochemical synthesis (MCS), mechanical alloying (MA), cold pressing, and pressureless sintering are combined to produce composites. First of all, MoSi2 and WSi2 nanoparticles are synthesized by MCS and selective acid leaching, yielding reinforcement materials for Al–Cu matrix. Powder blends consisting of 95 wt% Al and 5 wt% Cu are mixed with metal disilicides at different weight percentages (1, 2, and 5 wt%). MA for 4 h is conducted on these overall blends using a high‐energy ball mill. Microstructural and thermal properties of the as‐blended and mechanically alloyed powders are determined, and then they are compacted under 450 MPa and sintered at 550 °C for 2 h. Mechanical characterization of the composites reveals an increase in hardness and wear resistance with an increasing amount of reinforcement content. Among bulk samples, 5 wt% WSi2‐reinforced composites have the highest microhardness (165 ± 15 HV) and lowest wear rate (1.69 × 106 μm3 Nm−1) values. However, under the compression forces, the highest toughness and strength are obtained from 2 wt%‐reinforced composites.

Graphene nanoplatelet reinforced Al-based composites prepared from recycled powders via mechanical alloying and pressureless sintering

This study reports on the powder metallurgy preparation and characterization of aluminum-graphene nanoplatelet (Al-GNP) composites synthesized using recycled Al powders. Recycled Al and GNP powders (0.1–1 wt%) were mechanically alloyed (MA'd) for 4 h, followed by cold pressing (at 450 MPa) and pressureless sintering at 590 °C for 2 h. Starting powders were analyzed using an optical emission spectrometer (OES) and a Raman spectrometer. Also, MA'd powders and sintered samples were characterized using an X-ray diffractometer (XRD), a scanning electron microscope/energy dispersive spectrometer (SEM/EDS), and a differential scanning calorimeter (DSC). Particle size analyses, pycnometer, and Archimedes' densities, Vickers microhardness, dry-sliding wear, and compression tests were also conducted. The Al4C3 formation was observed in the XRD patterns of sintered compositions. The highest and lowest relative densities were measured for the 1 wt% and 0.1 wt% GNP reinforced samples as 97 % and 92 %, respectively. The highest hardness value was obtained as approximately 1.31 GPa for 1 wt% GNP reinforced. With the addition of reinforcement GNP, the wear rate developed to approximately 0.00225 mm3/Nm. The compressive strength increased from nearly 70 MPa to 162 MPa.

Near-infrared-emitting (Gd1-yNdy)3(Ga1-xCrx)5O12 Glass Ceramic Phosphors for Light-emitting Diodes

In this study, we proposed a blue-excitable and near-infrared (NIR) emission ceramic phosphor - Gd3Ga5O12:Cr3+, Nd3+ (GGO:Cr, Nd) by a solid-state reaction for light-emitting diode applications. The as-synthesized Gd3Ga4.95Cr0.05O12 phosphor displayed a broad emission peak at 759 nm (4T2 → 4A2) with a full-width-half-maximum of 122 nm under 460 nm excitation. In order to generate NIR, we introduced Nd3+ ions as activators to substitute Gd3+ ions in GGO:Cr3+ phosphors. Via energy transfer from Cr3+ ions to Nd3+ ions in GGO, an intense NIR emission at 1064 nm resulting from 4F3/2 → 4I11/2 is demonstrated. Furthermore, we investigate the doping effects at various concentrations and reanalyzed the luminescent characteristics of (Gd1-yNdy)3(Ga1-xCrx)5O12 phosphors to determine the optimal doping concentration of Cr and Ni, which were found to be 1 mol.% and 3 mol.%, respectively. Finally, we mix the composition-optimized (Gd0.97Nd0.03)3(Ga0.99Cr0.01)5O12 NIR-emission phosphor with silica-based glass powder. After cold pressing and high-temperature sintering using molds, we obtain NIR-emitting glass-ceramic phosphors through laser cutting technology and packaged them into high-power light-emitting diodes.

Mineral Mimetic Material Sr-Exchanged Sitinakite of Different Crystallinity: Phase Transformations during Heat Treatment and the Strength of SR Fixation in a Ceramic Matrix.

A simple method for the direct transformation of Sr-exchanged titanosilicate with the sitinakite structure (IONSIV) into ceramic material through cold pressing and subsequent sintering at 1100 °C for 4 h is presented. The temperature transformation of Sr-exchanged sitinakite showed the stages of recrystallization of the material with the formation of Sr-Ti phases matsubaraite (Sr4Ti5[Si2O7]2O8), jeppeite (SrTi6O13), tausonite (SrTiO3), and rutile. Leaching experiments showed the efficiency of fixation of Sr cations in a ceramic matrix; extraction into water does not exceed 0.01% and desorption in 1 M HNO3 solution is only 0.19% within three days. The leaching rates of immobilized Sr demonstrate the structural integrity of the formed phases in the ceramic (2.8 × 10-5-1.0 × 10-5 g/(m2·day). The decrease in the crystallinity of the initial Na-sitinakite, which is achieved by reducing the synthesis temperature from 250 to 210 °C, does not affect the sorption capacity and the fixation of cations in the ceramic matrix. The obtained results confirm the prospect of using inexpensive precursors, titanium ore enrichment waste, for the synthesis of sorption materials.

Metal Scrap to Hydrogen: Manufacture of Hydroreactive Solid Shapes via Combination of Ball Milling, Cold Pressing, and Spark Plasma Sintering.

Two sorts of tablets were manufactured from ball-milled powder (aluminum scrap and copper) by cold pressing and spark plasma sintering. Their microstructure, phase, and elemental compositions were investigated via scanning electron microscopy, X-ray diffraction analysis, and energy-dispersive X-ray spectroscopy. New phases, Al2Cu and MgCuAl2, were detected in the samples. Their microstructure was formed by welded scrap particles, the intermetallides, and Cu-rich regions located majorly along 'interparticle boundaries' and, to a lesser extent, within small, micro- and nanosized 'intraparticle spots'. The tablets were sealed with adhesive, so only the top surface was exposed to the environment, and tested in a chlorine aqueous solution for hydrogen generation performance. For both sample sorts, hydrogen yields of nearly 100% were achieved. The sintered tablets reacted faster than the cold-pressed ones: at 60, 70, and 80 °C, their entire 'conversion into hydrogen' took ~80, 40, and 30 min. vs. ~220, 100, and 70 min. The experimental kinetic curves were fitted with a contracting geometry equation, and those for the sintered samples were approximated with higher precision. The key effect of the additive was to enhance hydrogen evolution through the galvanic corrosion of Al in the regions adjacent to the intermetallic inclusions and Cu-rich spots.

PES-g-BST/PEEK composites modified by surface grafting with high dielectric tunability

Ceramic/polymer composites have been widely utilized due to their outstanding dielectric and mechanical properties. The interfacial bonding between ceramic and organic phases has a significant effect on the properties of composites. Therefore, enhancing the interfacial bond strength has become a hot issue. In this work, a chemically modified PES-g-BST/PEEK composite was prepared via cold-pressing sintering. The chemical bond was constructed to connect one end of PES (polyether sulfone) with BST (barium strontium titanate) and the other end with PEEK (polyether ether ketone) by using 4,4′-Diaminodiphenylsulfone (DDS), which enhanced the interface combination between ceramic fillers and organic phase. The influence of the surface grafting method and the amount of DDS on the microstructure and dielectric characteristics of the PES-g-BST/PEEK composite was investigated, and the amount of DDS was optimized. The permittivity, dielectric tunable efficiency, and dielectric tunability of the composites were improved. A chemically modified PES-g-BST/PEEK composite with improved dielectric properties and high dielectric tunability was obtained. The dielectric tunability amounts to 38.16% under a 7 kV/mm bias, accompanied by a low dielectric constant of 14.5 and a dielectric loss of 0.076 (1 kHz). This work provides a way of enhancing the interface bonding of ceramic/polymer composites to improve dielectric tunability.

Influence of Tic on Density and Microstructure of Al2O3 Ceramics Doped with Nb2O5 and Lif

Ceramic matrix composites are widely studied in the ballistic sector due to their high hardness, fracture toughness, and improved ballistic performance in multilayer shielding systems. However, the presence of dopants in ceramics can pose challenges during processing and potentially compromise the final properties of the sintered material. This study focused on the ceramic processing of Al2O3-based ceramic matrix composites by adding 4 wt.% Nb2O5 (niobium oxide), 0.5 wt.% LiF (lithium fluoride), and 38.5 wt.% TiC (titanium carbide). The composites were produced using cold uniaxial pressing and conventional sintering at 1400 °C for 3 h. The composites were characterized using Archimedes’ principle and scanning electron microscopy (SEM). The results revealed that the samples to which TiC was added exhibited low initial densities, indicating that the applied pressure of 50 MPa during cold pressing was insufficient to adequately densify the green bodies. Moreover, the presence of TiC led to a significant reduction in densification, making it challenging to apply a conductive coating for SEM analysis. Adjustments to the intensity of the electron beam were necessary to conduct the analysis successfully. Conversely, the samples to which TiC was not added exhibited high density values in the green state and yielded consistent results after sintering in line with previous research, indicating a satisfactory degree of sintering in the absence of TiC. These findings highlight the importance of carefully considering the addition of TiC in ceramic matrix composites during processing, which can have a significant impact on densification and subsequent material properties. The results contribute to the understanding of processing parameters with regard to the production of ceramic composites with desirable characteristics for ballistic applications.

Microstructure, phase stability, and mechanical properties of (AlLiMg0.5Ti1.5)100-xScx lightweight high-entropy alloys

(AlLiMg0.5Ti1.5)100-XScX (x = 0, 5, 10, 15, 20) lightweight high-entropy alloys (LW-HEAs) were fabricated by mechanical alloying and cold-press sintering (CPS). The effects of Sc content and sintering temperature on the microstructure, phase stability, and mechanical properties of the alloys were investigated, via multiple characterization methods including XRD, SEM, EDS and microhardness tests. The results reveal that the as-milled (AlLiMg0.5Ti1.5)100-XScX (x = 0, 5, 10, 15, 20) LW-HEAs form a single HCP solid solution phase or a simple microstructure dominated by an HCP solid solution phase. After CPS, significant phase transformation occurs. Higher Sc content improves alloy phase stability and inhibits phase transformation during the sintering, which is influenced by kinetic and thermodynamic factors. Among them, the alloy containing 20 at.% Sc (#Sc20) sintered at 550 °C is composed of HCP solid solution phase and a small amount of γ-Al12Mg17 phase, and this alloy has the simplest microstructure among all the alloys. The alloys generally display high Vickers-hardness. In addition, with increasing Sc content and sintering temperature, the hardness of the alloys increases obviously. Among them, the hardness of #Sc20 alloy sintered at 650 °C is as high as 589 HV, which is the highest among all the alloys.

Effect of TiO2 reinforcement on low temperature (1300 °C) sinterability of zirconia toughened alumina ceramics by correlating its structural and physico-mechanical properties

The primary goal of this research is to investigate the sinterability of zirconia toughened alumina (ZTA) at low temperature (1300 °C) utilizing two different sintering techniques: hot press and cold press. The effect of titanium oxide (TiO2) content variation (0–5 wt%) in ZTA is compared for each sintering method. The solubility limits of TiO2 in ZTA are identified to be 2 wt% and 3 wt% for hot press and cold press sintering respectively which have served exceptional physical and mechanical properties. In the case of hot press, outstanding relative density (99%) is achieved due to excellent compaction, including high microhardness of ∼2092 HV0.5, nanohardness of ∼25.05 GPa, elastic modulus of ∼371.59 GPa and indentation fracture toughness of ∼5.43 MPa·√m for 2 wt% TiO2 inclusion. Whereas in the case of cold press, 3 wt% TiO2 addition has revealed a considerable relative density (96%), alongside microhardness of ∼1975 HV0.5, nanohardness of ∼20.92 GPa, elastic modulus of ∼280.39 GPa and an indentation fracture toughness of ∼4.84 MPa·√m. However, further addition of TiO2 leads to the formation of secondary phases i.e., tialite and zirconium titanate which deteriorate the mechanical and physical properties due to the abnormal grain growth. Therefore, it has been postulated that the small additions of TiO2 have enormous capability of lowering the sintering temperature of ZTA-MgO ceramic without compromising the physical and mechanical characteristics.

MoB2/MoB ceramic particulate reinforced W-1 wt % Ni matrix composites as potential plasma facing materials

This study reports on the synthesis and characterization of MoB2/MoB ceramic particulate reinforced W-1 wt % Ni matrix (W1Ni) composites for their potential usage as plasma facing materials. A powder metallurgical route consisting of mechanical alloying (MA), cold pressing (CP), cold isostatic pressing (CIP) and pressureless sintering (PS) was applied for the production of MoB2/MoB particulate reinforced W1Ni composites. Different percentages of MoB2/MoB (x = 1, 2, 5 and 10 wt %) were incorporated into W1Ni pre-alloy. MA was performed in a planetary ball mill for different times as 24, 48 and 72 h. After compaction using CP and CIP, green bodies were pressureless sintered at 1400 °C for 1 h under Ar/H2 gas flow. According to the results of XRD characterization, and lattice strain, crystallite size and particle size analyses performed on the powders, MA time was determined as 72 h with an average lattice strain of 2.37% and crystallite size of 7.40 nm. Sintered samples characterized in terms of compositional, microstructural, wear, density and microhardness properties exhibited that W1Ni-10 wt % MoB2/MoB composite has the highest hardness value of ∼6.74 GPa and the lowest wear volume loss of 2.08 × 10-4 mm3, as compared to those of other samples. Sintered samples exposed to 20 eV He+ ion irradiation with a flux of 1.102 × 1021 ions/(m2s), irradiation fluence of 1.32 × 1024 ions/m2 for 20 min had a degraded wave-shaped structure (wavy erosion layers) on their surfaces. However, W1Ni-2 wt % MoB2/MoB composite showed relatively more resistant to ion irradiation attributed to its higher densification rate.

Effect of milling parameters on the morphology and sinterability of the yttrium oxide powders for transparent ceramics

Yttrium oxide has multiple applications both as a transparent material with good optical, mechanical, and thermal properties, and for photonics when doped with rare earth ions. To achieve full transparency, a careful control of the process, from the selection of powders to the final densification by sintering, is required. In this context, the characteristics of the starting powders have a great impact on the final properties. In the present work, the effect of milling conditions of two commercial Y2O3 powders on the properties of ceramics obtained by cold isostatic pressing (CIP) and vacuum sintering was investigated. The milling rate varied between 80 and 300 rpm, and the milling time between 1 and 22 h. It was found that the optimal treatment conditions are 300 rpm for 65 min, which provided a homogeneous nano-sized Y2O3 powder. IR-transparent Y2O3 ceramics obtained by a vacuum sintering have a transmittance of 78.30% (1100 nm).

Phase evolution and aqueous durability of nanograin Gd2Hf2O7 ceramic as a potential nuclear waste immobilization matrix

A nanograin (Gd2Hf2O7, GHO) ceramic is prepared using a sol-gel and cold-pressing sintering method as a potential curing matrix material for the high-level radioactive waste (HLW). The microstructure, phase evolution, Raman spectra and aqueous durability of the nanograin GHO samples are comprehensively studied. Results show that the sintered powder of the GHO ceramic undergoes a transition from defective fluorite to a pyrochlore structure in the process of increasing the sintering temperature from 1273 to 1673 K. As the pressing pressure increases from 5 to 30 MPa, the density of the GHO sample increased from 7.25 to 8.25 g cm−3, and the corresponding open porosity decreases from 7.61 to 3.95%. XRD, Raman, and microstructure analysis confirmed that the GHO sample pressed at 30 MPa and sintered after 1673 K exhibits a typical nanograin pyrochlore structure with an average grain size of 167 nm. The normalized release rates of Gd and Hf elements in the optimized GHO sample after 42 days are 6.7 × 10−6 g m−2 d−1 and 7.9 × 10−7 g m−2 d−1, respectively, which exhibited good aqueous durability. The results can provide an alternative candidate for the development of HLW curing matrix material with enhanced environmental stability.

Preparation and characterization of NaNO3 shape-stabilized phase change materials (SS-PCMs) based on anorthite ceramic and cordierite ceramic for solar energy storage

In the current study, molten NaNO3 shape-stabilized phase change materials (SS-PCMs) based on anorthite ceramic and cordierite ceramic were prepared by cold-press sintering method. Chemical compatibility and wettability were considered simultaneously to determine whether the ceramics were qualified as supporting skeleton and the enhancement of the thermal properties of NaNO3 by the ceramics was also investigated. It was found that both anorthite ceramic and cordierite ceramic have good chemical compatibility with NaNO3 and no chemical reaction occurred between them. Physical compatibility was evaluated by measuring the contact angle of molten NaNO3 on a ceramic substrate. Cordierite ceramic exhibited better wettability than anorthite ceramic, although both of the contact angles decreased gradually with increasing temperature. The supercooling of the prepared anorthite ceramic-based SS-PCMs with 45 wt% NaNO3 (45ASS-PCMs) was only 0.7 °C, which was less than 2.5 °C for pure NaNO3 and 2.0 °C for cordierite ceramic-based SS-PCMs with 45 wt% NaNO3 (45CSS-PCMs). The phase transition enthalpy loss of 45ASS-PCMs after 100 thermal cycles was less than 2%, while 45CSS-PCMs reached more than 5%. Anorthite ceramic showed better capabilities than cordierite ceramic in terms of thermal reliability and stability, while cordierite ceramic was better than anorthite ceramic in enhancing thermal conductivity. The evaluation method proposed in this study provided favorable guidance for the matching of PCMs and ceramic supporting skeleton.

(Ba0.6Sr0.4)TiO3/PEEK composites modified by polyethersulfone with low dielectric constant and high dielectric tunability under DC bias

Ceramic/polyetheretherketone (PEEK) composites show a wide range of applications and have attracted extensive interest in the scientific community due to their outstanding dielectric and mechanical characteristics. However, the interface connection between the ceramic and PEEK is a vital issue that must be addressed to improve their physical and electrical properties. In this work, the polyethersulfone resin (PES) was selected as interface modifier between barium strontium titanate (Ba0.6Sr0.4TiO3, BST) and PEEK. Cold-pressing sintering was used to create BST/PEEK materials with superior dielectric frequency stability and dielectric tunability. The effects of PES content on the morphology and dielectric characteristics of PES modified BST/PEEK materials were investigated. The results showed PES could improve the dispersion of BST particles in polymer. The dielectric constant, dielectric tunability, and breakdown strength increased first, then reduced as PES content increased. The composite had the most homogeneous microstructure and the best dielectric properties when the PES content was 7.5 vol%. The frequency dispersion factor F(x) was much smaller than that of other ceramic/polymer composites reported. In addition, the dielectric tunability of the composites could reach a relatively high level (34.18%) while the dielectric constant was as low as 14. The dielectric tunable efficiency (TuE) was proposed to evaluate the property of low dielectric constant and high dielectric tunability under DC bias. The TuE of PES modified BST/PEEK composites show the highest value comparing with reported dielectric tunable composites. This research laid the path for the development of a novel ceramic/polymer composite with good interface bonding and high dielectric tunability.

The “pinning” effect of in-situ TiB whiskers on the hot deformation behavior and dynamic recrystallization of (10 vol%) TiB/Ti–6Al–4V composites

In-situ (10 vol%) TiB/Ti–Al–4V composites were prepared by employing cold isostatic pressing and vacuum sintering. The “pinning” effects of TiB whiskers on the hot deformation behavior and dynamic recrystallization of composites in the temperature range of 1000–1200 °C with strain rates from 0.01 to 10 s−1 were investigated in terms of flow behavior, hot-processing maps, and microstructural evolution. No flow instability region within the specified range was found. The dominant deformation mechanisms of the composites were CDRX and DDRX in the (α+β) and β regions, respectively. Owing to the “pinning” effect, prior-α could generate more grain boundaries by HAGB immigration to move through TiB whiskers. In the β region, owing to the deformation incompatibility and the “pinning” effect, more bulging of grain boundaries induced by TiB whiskers resulted in more nucleation sites for DDRX. On account of the “pinning” effect, TiB whiskers enhanced microstructural refinement by restricting grain growth.