High Temperature Shape Memory Alloys Research Articles

Investigating the effect of hot extrusion and annealing to the functional fatigue behavior of Ni50Ti30Hf20 high temperature shape memory alloy

This study reveals the functional fatigue properties of hot extruded and the effect of post annealing process to the cyclic stability and fatigue properties of Ni50Ti30Hf20 (at.%) alloy. Samples were cut from the hot extruded billet and three of them were randomly selected for functional fatigue experiments. Variation in the shape memory properties such as transformation temperatures, actuation and accumulated irrecoverable strain values was observed. Additionally, the samples showed 580, 754 and 1738 thermal cycles under 200 MPa in fatigue experiments. Six more samples were cut through the cross section of another piece of the extruded billet and enumerated for further fatigue testing to investigate the reason of the variation in the properties. The edges of the gauge sections of enumerated fatigue test samples were ground to remove the surface roughness. Although the fatigue life times were increased by 3–6 times with the edge grinding the differences in the values of the shape memory properties were still observed and this observation was attributed to the deformation variation and the residual stresses induced by hot extrusion. To overcome this problem, hot extruded samples were annealed and the fatigue experiments were repeated. All annealed samples exhibited the same transformation temperatures, actuation and accumulated irrecoverable strain values. Moreover, the transformation temperatures were stabilized and the fatigue life was increased to almost 12 000 cycles.

Processing, Preaging, and Aging of NiTi-20 at.% Hf High-Temperature Shape Memory Alloy from Laboratory to Industrial Scale

High-temperature shape memory alloys (HTSMAs) are a growing area of research in active materials that exhibit recoverable transformation strain and shape memory responses. They show promise for applications such as actuators in the aerospace, automotive, and energy exploration industries. NiTiHf is a cost-effective HTSMA solution with increased transformation temperatures above 115 °C. In this study, processing and aging treatments were performed on an industrially produced, hot-extruded Ni50.3Ti29.7Hf20 (at%) HTSMA. Portions of the extruded material were hot-rolled, pre-aged for 12 h at 300 °C, aged for 3 h at temperatures ranging 450–750 °C, or a combination. The goal of the aging treatments is to establish coherency between the interface of the matrix and H-phase nano-precipitates in the HTSMAs. After processing, the samples were characterized by differential scanning calorimetry, Vickers hardness testing, scanning electron microscopy, and synchrotron radiation x-ray diffraction. Previous studies have shown that pre-aging is effective for controlled nucleation of H-phase precipitates in low Hf content NiTiHf high-temperature shape memory alloys, this study shows that pre-aging of high Hf containing NiTiHf high-temperature shape memory alloys plays a small contributing role on thermal or mechanical properties, but is essentially ineffective and unnecessary at the pre-aging conditions examined here. Additionally, it is shown that hot-rolling can be used to control the orientation of H-phase in NiTiHf HTSMAs.

Effect of Sm Doping on the Microstructure, Mechanical Properties and Shape Memory Effect of Cu-13.0Al-4.0Ni Alloy.

The effects of rare earth element Sm on the microstructure, mechanical properties, and shape memory effect of the high temperature shape memory alloy, Cu-13.0Al-4.0Ni-xSm (x = 0, 0.2 and 0.5) (wt.%), are studied in this work. The results show that the Sm addition reduces the grain size of the Cu-13.0Al-4.0Ni alloy from millimeters to hundreds of microns. The microstructure of the Cu-13.0Al-4.0Ni-xSm alloys are composed of 18R and a face-centered cubic Sm-rich phase at room temperature. In addition, because the addition of the Sm element enhances the fine-grain strengthening effect, the mechanical properties and the shape memory effect of the Cu-13.0Al-4.0Ni alloy were greatly improved. When x = 0.5, the compressive fracture stress and the compressive fracture strain increased from 580 MPa, 10.5% to 1021 MPa, 14.8%, respectively. When the pre-strain is 10%, a reversible strain of 6.3% can be obtained for the Cu-13.0Al-4.0Ni-0.2Sm alloy.

Effect of annealing temperature on microstructure and mechanical response of sputter deposited Ti-Zr-Mo high temperature shape memory alloy thin films

The shape memory thin films are most suitable candidates as actuators in MEMS applications than other smart materials due to its ability to produce larger recovery strains at low operation voltages. Recently, Ti based shape memory alloys are gaining attention due to its ability to produce stable shape memory properties at high temperatures. In current study, Ti-Zr-Mo high-temperature shape memory thin films were fabricated using multi-target DC/RF magnetron sputtering system on Si (100) substrate. Deposition time and target power were varied to obtain the desired composition. Post-annealing was carried out at 500 °C, 600 °C and 700 °C for 15 min each to crystallize the thin films that were amorphous in the homogenized condition. The annealing temperature was varied to observe the structural and morphological changes. The total thickness of the film was found to be around 300 nm measured from the cross-sectional micrographs. The results suggest that flatness of surface topography is attributed to higher ad-atom mobility with increasing the annealing temperature. The martensite phase (α’) was observed after annealing at 500 °C and the formation of silicides was observed with annealing at higher temperatures. The transformation temperature of 220 °C was obtained from electrical resistivity measurement. The enhanced mechanical properties with maintaining structural stability was observed in Ti-Zr-Mo thin film annealed at 500 °C for 15 min.

A unified description of mechanical and actuation fatigue crack growth in shape memory alloys

The damage tolerance approaches to fatigue rely on fracture mechanics concepts to explicitly account for the fatigue crack growth process. These approaches typically adopt the Paris equation, which relates the crack growth per cycle to the range of variation of the stress intensity factor, ΔK, during cyclic loading by means of experimentally calibrated parameters. Conditions on the validity of a single parameter description of the near crack tip stress and strain fields restrict the applicability of ΔK to fatigue crack growth resistance in Shape Memory Alloys (SMAs) under general thermomechanical loading paths. These conditions are substantially relaxed for the cyclic ΔJ–integral approach, which can achieve similitude over a wider range of loading conditions and geometric configurations. Thus, ΔJ qualifies as a potential unified descriptor of thermomechanical fatigue crack growth resistance in SMAs, an assertion, which is tested in this work for data from both purely mechanical and actuation fatigue crack growth experiments of a high temperature SMA, Ni50.3Ti29.7Hf20. In the latter, compact tension specimens are subjected to thermal cycling under constant load between an upper and a lower cycle temperature that allows for the stable phase to alternate in each cycle. It is shown here that a Paris-type power-law crack growth expression based on the ΔJ-integral can fit fatigue crack growth rate data from both types of experiments with a single set of parameters. This new analysis method for both actuation and mechanical fatigue crack growth rates provides a unified description for fatigue crack growth in SMAs and can allow estimating actuation fatigue crack growth rates, laborious and challenging to measure, from easier to detect mechanical fatigue crack growth rates.

Transformation behavior and superelasticity of TiZrHfNiCoCu multi-component high-temperature shape memory alloys

Multi-component (TiZrHf)1Ni1.50Co0.60Cu0.90, (TiZrHf)1Ni1.48Co0.58Cu0.88, (TiZrHf)1Ni1.45Co0.57Cu0.86, and (TiZrHf)1Ni1.40Co0.54Cu0.82 high-temperature shape memory alloys (HTSMAs) were prepared by arc-melting and then microstructures, transformation temperatures, phase constituents and superelasticity were investigated by scanning electron microscope observation, differential scanning calorimetery, X-ray diffraction and dynamic mechanical analysis in tensile mode, respectively. The microstructure of solution treated TiZrHfNiCoCu HTSMAs specimens consisted of (TiZrHf)(NiCoCu)-type matrix and (TiZrHf)2(NiCoCu)-type second phase. The area fraction of the second phase increased from 1.7% to 17.2% with the increased in (TiZrHf) content from 50 at% to 52 at%. Martensitic transformation start temperature of the solution treated specimens increased from 53.5 °C to 188.7 °C with the increase in (TiZrHf) content from 50 at% to 52 at%. TiZrHfNiCoCu HTSMAs showed clear superelasticity in the solution treated state. The superelastic recovery strain of solution treated TiZrHfNiCoCu HTSMAs was in the range of 4.2–4.6% depending on the alloy composition.

A Low-Cost Ni-Mn-Ti-B High-Temperature Shape Memory Alloy with Extraordinary Functional Properties.

The rapid development of aerospace, automotive, and energy exploration industries urgently requires high-temperature shape memory alloys (HTSMAs) which are utilized as compact solid-state actuators, sensors, and energy conversion devices at elevated temperatures. However, the currently prevailing Ni-Ti-X (X = Pd, Pt, and Hf) HTSMAs are very expensive owing to the high cost of Pd, Pt, and Hf elements, which greatly limits their widespread applications. Here, we have developed an inexpensive (Ni50Mn35.5Ti14.5)99.8B0.2 bulk polycrystalline HTSMA with extraordinary high-temperature superelasticity and a giant two-way shape memory effect (TWSME). This alloy exhibits perfect superelasticity with a fully recoverable strain of as high as 7.1% over a wide temperature range from 150 to 280 °C. Furthermore, it shows a giant TWSME with a remarkably high recoverable strain of 6.0%. Both the recoverable strain of superelasticity and the two-way shape memory strain of the present alloy are the highest among the bulk polycrystalline HTSMAs. The theoretical maximum transformation strain was calculated with energy-minimization theory using the crystal structure information of martensite and austenite obtained from in situ synchrotron high-energy X-ray diffraction experiments to help understand the superelastic behavior of the present alloy. Combining the advantages of low cost and easy fabrication, the present bulk polycrystalline (Ni50Mn35.5Ti14.5)99.8B0.2 alloy shows great potential for high-temperature shape memory applications. This work is instructive for developing cost-effective high-performance HTSMAs.

Microstructures and Phase Transformations of Melt-Spun Ti-V-Al High Temperature Shape Memory Alloys with Addition of Zr

In this study, the effects of Zr addition on phase transformation temperatures, microstructure of Ti-12V-4Al (wt. %) high temperature shape memory alloys (HTSMAs) manufactured using melt-spinning technique were investigated. During heating, differential scanning calorimetry (DSC) curves showed that austenite transformation temperature of Ti-12V-4Al (wt. %) melt-spun ribbon was single-stage transformation and Ti-12V-4Al-0.5Zr (wt. %) melt-spun ribbon was two-stage transformation. In the scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyzes, unveiled that the melt-spun ribbons consisted of martensite, austenite and R phases. Transmission electron microscopy (TEM) analysis showed that the thickness of martensite plates in ribbons was thinned by the addition of Zr.

Mechanical and Microstructural Properties of Ti-V-Al High Temperature Shape Memory Alloy

The phase transformation, microstructural and mechanical properties of Ti-15V-2Al high temperature shape memory alloy produced with arc-melting method were investigated by DSC, XRD, SEM and high temperature micro-indenter system. The reverse martensitic transformation As starting and Af finishing temperatures of alloy were obtained to be 195 °C and 285 °C, respectively. In high temperature microindentation analysis, the alloy were subjected to indentation tests under 5000 mN load for three different temperatures (24 °C, 250 °C and 450 °C). The hardness and reduced elastic modulus values of the alloy at room temperature (24 °C ), that is, martensite structure, were found to be higher than the values at 450 °C, that is, austenite structure. The effect of temperature on superelasticity was examined and it was found that the superelasticity value of the alloy was higher at 450 °C compared to its value at 24 °C.

Laboratory-Scale Processing and Performance Assessment of Ti\u2013Ta High-Temperature Shape Memory Spring Actuators

Ti75Ta25 high-temperature shape memory alloys exhibit a number of features which make it difficult to use them as spring actuators. These include the high melting point of Ta (close to 3000 °C), the affinity of Ti to oxygen which leads to the formation of brittle α-case layers and the tendency to precipitate the ω-phase, which suppresses the martensitic transformation. The present work represents a case study which shows how one can overcome these issues and manufacture high quality Ti75Ta25 tensile spring actuators. The work focusses on processing (arc melting, arc welding, wire drawing, surface treatments and actuator spring geometry setting) and on cyclic actuator testing. It is shown how one can minimize the detrimental effect of ω-phase formation and ensure stable high-temperature actuation by fast heating and cooling and by intermediate rejuvenation anneals. The results are discussed on the basis of fundamental Ti–Ta metallurgy and in the light of Ni–Ti spring actuator performance.

Multi-objective Optimization of Cutting Parameters for Machining Process of Ni-Rich NiTiHf High-Temperature Shape Memory Alloy Using Genetic Algorithm

Multi-objective Optimization of Cutting Parameters for Machining Process of Ni-Rich NiTiHf High-Temperature Shape Memory Alloy Using Genetic Algorithm

Transformational, microstructural and superelasticity characteristics of Ti–V–Al high temperature shape memory alloys with Zr addition

This study analyzes the influences of Zr addition on the martensitic transformation behavior, microstructural evolution, mechanical properties and superelasticity effect of arc-melted Ti-12V-4Al-xZr (x = 0, 0.5, 1, 1.5 and 2 wt.%) high temperature shape memory alloys (HTSMA). The results revealed that the austenite transformation temperatures and activation energy values decreased linearly when the Zr addition was greater than 0.5 wt.%. The Ti-V-4Al (wt.%) and Ti12V-4Al-0.5Zr (wt.%) alloys were composed of α″ martensitic phase, while the others consisted of predominant α″ martensitic phase and a small amount of the β austenite phase. The thickness of martensitic plates in the alloys reduced with increased Zr addition. Hardness and reduced elastic modulus values calculated from load-depth curves of the alloys also decreased with increasing Zr addition. Along with the increase in the Zr addition, the alloys’ superelasticity behavior decreased at room temperature (24 °C), while this behavior increased at the high temperatures (450 °C).

Stress-induced crystallographic and microstructural evolution for hierarchically twinned martensite in single- and dual-phase Ni-Mn-Ga alloys

Polycrystalline Ni54+xMn25Ga21-x high temperature shape memory alloys were developed to examine the Ni-content dependent crystallographic features, phase transformation and deformation behavior. The alloys were characterized by a hierarchically twinned martensite structure with the co-existence of ductile γ phase in Ni57 and Ni58 alloys. Two types of twinning relationships existed, i.e., (112) compound twin in the internal nano-lamellae and 11¯2 type-I twin in the adjacent micro-variants. The martensitic start temperature, compressive strength and ductility increased with increasing Ni content. However, the corresponding shape recovery capability was significantly deteriorated in the higher Ni-containing alloys. For the single-phase alloy, the detwinning/reorientation of internal nano-lamellae and activation of deformation twins contributed to the macroscopically recoverable strain in case of low pre-strains. In contrast, large pre-strains led to piles-up of dislocation, bending and kinking of twinning interfaces, formation of deformation bands and crossing of twin structures. These irreversible processes produced massive unrecoverable strain. Almost no detwinning and twining processes were observed in the dual-phase alloys due to the severe lattice distortion. Instead, most deformation occurred via dislocation motion in γ phase.

Effect of Nickel Content on Processing of Ni-Rich NiTiHf High-Temperature Shape Memory Alloys

Effect of Nickel Content on Processing of Ni-Rich NiTiHf High-Temperature Shape Memory Alloys

Wire-EDM machinability investigation on quaternary Ni44Ti50Cu4Zr2 shape memory alloy

ABSTRACT Shape memory alloy (SMA), also called memory metal, is a smart material that exhibits unique shape memory effect and superelasticity properties. NiTi alloys attract researchers because of their myriad applications in areas such as aerospace, medicine, and robotics. In the present NiTi SMA fabrication, the Cu and Zr elements were added to increase the martensitic transformation temperatures. The current study focuses on the machining of high-temperature Ni44Ti50Cu4Zr2 SMA by coated wire electric discharge machining (W-EDM). Machining quality features like surface undulation and material removal were studied by considering current (I), servo voltage (SV), pulse on time (Ton), angle of cut (AC), and pulse off time (Toff). Parametric analysis of machining characteristics has been investigated by conducting experiments following the response surface approach based central composite design (RSM-CCD). It was found that MRR has increased by 57% and Ra by 58% with a gradual increase in pulse on time and applied current and decreases gradually on increasing servo voltage and pulse off time. XRD analysis reveals the presence of an oxide layer on the wire-EDMed surface. The study of SEM confirms the formation of the melted layer, micro-voids, and micro-cracks, resulting in surface irregularities.

Metastable phase diagram on heating in quenched Ti-Nb high-temperature shape memory alloys

Metastable phase diagrams of β (BCC)-Ti high-temperature shape memory alloys (HTSMAs) have been investigated extensively, where however β→isothermal ω (iso-ω, hexagonal) transition upon heating has not been accessed. Following α” (orthorhombic)→β reverse martensitic transformation on heating, iso-ω precipitation is commonly encountered. These two transitions may overlap within certain composition range, but have not been clearly differentiated. It is of vital importance for the understanding of the subsequent transition behaviors. In this paper, phase transformations upon heating at various heating rates were characterized in quenched Ti-(16–25 at.%)Nb HTSMAs. In contrast to the linear increase in As (the starting temperature of α”→β transition) with decreasing Nb-content, ωs (the starting temperature of β→iso-ω transition) exhibits normal decrease firstly and shows abnormal increase below 20Nb. It is because iso-ω precipitates only in the reversed β phase but not in α” martensite proved by transmission electron microscopy observations. Namely, β→iso-ω transition is postponed to higher temperature due to the suppression of α” martensite below 20Nb. On this basis, the characteristics of both transformations can be determined for Ti-Nb below 20Nb by proper peak deconvolution. New metastable phase diagrams of Ti-Nb are formulated, including both α”→β and β→iso-ω transitions upon heating. Moreover, effective activation energies for β→iso-ω transition during isochronal annealing are determined by the Kissinger method.

Microstructural characterization and functional performance of Ni54Mn25Ga21-xDyx high-temperature shape memory alloys

The present study investigated the influences of Dy-addition on the microstructural characterization, functional behaviour and deformation mechanisms in high-temperature Ni54Mn25Ga21 alloys. The results indicated that adequate Dy-addition contributed to a desirable trade-off among compressive strength, ductility and functional performance. Ni54Mn25Ga20.9Dy0.1 alloy showed the highest shape memory recoverable strain due to the improvement of mechanical properties and formation of small Dy-rich precipitates. Meanwhile, an obvious pseudoelasticity was observed over a wide temperature range with a maximum recoverable strain of 3.74% at 320°C in this alloy. All the Dy-containing alloys exhibited low thermal hysteresis. However, it was revealed that an abnormal relationship between thermal hysteresis and middle eigenvalue existed for the investigated alloys with a lattice transition from cubic to tetragonal.

Smart polyimide with recovery stress at the level of high temperature shape memory alloys

Recovery stress is important for smart shape memory materials (SMMs) and low recovery stress of shape memory polymers hinders their applications badly, while high temperature shape memory alloys (HTSMAs) are very difficult to be obtained. In order to obtain high temperature SMM with high recovery stress, convenient preparation methods, low cost and good workability, shape memory polyimide with high recovery stress (HRSMPI) at the level of HTSMA is prepared by reinforcing smart polyimide matrix with carbon fiber cloth (CFC) in common lab furnace. The HRSMPI possesses unique sandwich structure with good interfacial bonding between the matrix and filler. It exhibits high glass transition temperature of 300 °C, shape fixity of 90.6% and shape recovery of 92.2%. The recovery stress of HRSMPI is 116 MPa, close to those of some HTSMAs. The primitive actuator made of HRSMPI can overturn metal sheet 147 times heavier than itself, similar to the commercial TiNiHf HTSMA. Meanwhile, its density is 0.96 g cm−3, less than 1/6 of that of TiNiHf. The elastic strain energy is mainly stored in CFC and then released as recovery stress under constrained shape recovery, and HRSMPI has great potential in practical applications.

Processing and Scalability of NiTiHf High-Temperature Shape Memory Alloys

Processing and Scalability of NiTiHf High-Temperature Shape Memory Alloys

Laser welding of H-phase strengthened Ni-rich NiTi-20Zr high temperature shape memory alloy

Laser welding of a Ni-rich NiTi-20Zr (at.%) high temperature shape memory alloy was performed. The starting base material was aged for 3 h at 550 °C followed by air cooling prior to welding to induce H-phase precipitation. Advanced microstructure characterization encompassing scanning and transmission electron microscopy, coupled with synchrotron X-ray diffraction, were used. Defect-free welds were obtained with a conduction welding mode. The weld thermal cycle altered the microstructure across the heat affected and fusion zones of the joints. The heat affected zone exhibited partial H-phase dissolution, causing a decrease in hardness. In the fusion zone, the H-phase fully dissolved, and the non-equilibrium rapid solidification conditions prevented the H-phase from re-precipitating during cooling, leading to a microstructure resembling that of an as-cast alloy with the same material composition. Mechanical testing revealed that the laser welded samples sustained stresses in the order of 500 MPa and exhibited stress-strain responses comparable to those of the unwelded base material. Thus, this initial study shows new possibilities for using advanced laser joining methods in these alloys.