Article
Chemistry, Physical
Xin Liu, Heng Li, Yanhong Zhang, Zhiwei Yang, Qingfei Gu, Xinhao Wang, Yifan Zhang, Jingchao Yang
Summary: NiTiFe alloys are widely used in the aerospace industry due to their excellent shape memory properties. However, the deformation behavior and shape memory mechanism of NiTiFe alloys at cryogenic temperatures are still unclear. In this study, we investigated the deformation behavior and shape memory mechanism of Ni47Ti50Fe3 alloy at temperatures ranging from -190℃ to 150℃. The findings revealed that the deformation behavior of NiTiFe alloy can be classified into four classes corresponding to different deformation mechanisms. The best shape memory effect was observed at deformation temperatures near Mf (-180℃).
Article
Materials Science, Multidisciplinary
Hamed Shahmir, Fatemeh Kiani, Sadjad Baradari, Natalia Resnina, Rashid Bikbaev
Summary: The addition of Zr can suppress the martensitic phase transformation of NiTi alloys, leading to a significant increase in hardness and exhibiting pseudoelasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
E. Alarcon, L. Heller, E. de Prado, J. Kopecek
Summary: This work analyzed the effects of temperature and microstructure on the tensile behavior of superelastic NiTi wires. Cold-drawn NiTi wires with different final heat treatments were subjected to temperature gradients, and the deformation processes and microstructure changes were characterized. The results showed that the stress of localized martensitic transformation stabilized with increasing temperature, while the volume fraction of martensite decreased. Ductility exhibited a non-monotonic evolution with temperature, with higher ductility observed in samples with more microstructure recovery or recrystallization.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
E. Iaparova, L. Heller, O. Tyc, P. Sittner
Summary: The functional behavior of nanocrystalline NiTi shape memory wires with different austenitic microstructures was investigated. Three phenomena were reported and discussed: the elongation and subsequent shortening of martensitic NiTi wire under low applied stresses due to thermally induced martensite reorientation, the martensite stabilization by deformation caused by change of martensite variant microstructures, and the generation of unrecovered plastic strains and dislocation defects during martensitic transformation/reorientation/detwinning processes.
Article
Crystallography
Li-Wei Tseng, Chih-Hsuan Chen, Wei-Cheng Chen, Yu Cheng, Nian-Hu Lu
Summary: The shape memory properties and microstructure of Fe41Ni28Co17Al11.5(Ti+Nb)(2.5) (at.%) cold-rolled alloys were studied for the first time using constant stress thermal cycling experiments in a three-point bending test. The thermo-magnetization curves showed evidence of martensitic transformation, and the transformation temperatures increased with aging time. The experimental recoverable strain values were lower than theoretical values, possibly due to factors such as low angle grain boundaries and brittle grain boundary precipitates.
Article
Chemistry, Physical
Yanqing Zhang, Shuiyuan Yang, Laisen Wang, Shaobin Pan, Jinbin Zhang, Xingjun Liu, Cuiping Wang
Summary: This paper reports the superelasticity and excellent cycle stability of boron-microalloyed Co-V-Al-Fe shape memory alloy. The addition of boron results in refined grain size and improved mechanical and superelastic properties in the alloy.
Article
Physics, Applied
Jian Liu, Ze-Ming Fan, Han-Yang Qian, Hai-Le Yan
Summary: This Letter reports on a polycrystalline Ni44.1Co5.0Mn36.1In13.4Cu1.4 alloy with a large magnetic field-induced stress of 14.4 MPa/T and a low stress hysteresis of 50 MPa, making it a promising candidate for high-energy output and high-efficient actuators. The large magnetostress is mainly attributed to the substantial transformation entropy change of 15.4 J/(kg K) and the high sensitivity of phase transformation temperature to the magnetic field of -9.2 K/T. Additionally, the possibility of enhancing transformation reversibility and expanding the cooling temperature window through the multicaloric strategy has been explored.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Longfei Wang, Peihua Feng, Xuegang Xing, Ying Wu, Zishun Liu
Summary: The study proposes a one-dimensional constitutive model for shape memory alloys considering the inelastic strains caused by the R-phase transformation, which is capable of predicting the deformation properties and phase transformation behavior of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Bo Li, Shuangming Li, Bin Yang, Hong Zhong, Zhenpeng Liu, Dou Li
Summary: Solid-state cooling based on elastocaloric effect shows potential for refrigeration. This study focuses on the improvement of elastocaloric effect and thermal cycle stability using directional solidification technique to prepare single-crystal Ni50Mn31.6Ti18.4 shape-memory alloys. The results reveal that the single crystal solidified at 10 μm/s exhibits superior adiabatic temperature and cyclic stability compared to alloys solidified at higher rates. The findings highlight the significance of microstructure in enhancing the elastocaloric performance of shape-memory alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yanqing Zhang, Xianjie Zhang, Shuiyuan Yang, Shaobin Pan, Jinming Wang, Yong Lu, Jiajia Han, Xingjun Liu, Cuiping Wang
Summary: The phase equilibria of the Co-V-Ga ternary system at 1000 degrees C and the composition dependence of martensitic transformation characteristics in Co2VGa Heusler alloys were investigated. The study identified different phases and compounds in the system, determined critical compositions, and designed a shape memory alloy with significant shape recovery. The results provide valuable information for composition designation and estimation of martensitic transformation temperatures in Co-V-Ga Heusler shape memory alloys.
Article
Materials Science, Multidisciplinary
Chao Song, Shuai Ren, Shaohui Li, Shengwei Li, Guijun Liu, Zhihua Nie, Yandong Wang, Daoyong Cong
Summary: This study utilizes strain glass to improve the reversibility of phase transformation. The incorporation of Al into Ti-Zr-Ni-Cu induces strain glass and endows the alloy with reversible phase transformation and ideal superelasticity.
MATERIALS RESEARCH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
J. Makkar, B. Young, I Karaman, T. Baxevanis
Summary: Materials with irreversible deformation show increasing resistance to crack advance, known as stable crack growth. Experimental observations indicate that crack advance-induced toughness enhancement in hysteretic materials could be reversed by partial unloading, impacting the evaluation of the resistance curve. Additionally, the study provides experimental verification of theoretical insights into the mechanics of stable crack growth.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Multidisciplinary
Serkan Dal, Bilal Demirel, Murat Eskil
Summary: This study investigated the structural effects and phase transformations of NiMnGa shape memory alloys with different compositions using X-ray diffraction, DSC analysis, SEM, and optical microscope. The addition of different elements and heat treatment were found to be beneficial for improving various physical properties, such as shape memory and mechanical properties. The results showed that the alloy with higher Mo content had smaller crystallite size and increased lattice volume with longer heat treatment time.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2021)
Article
Mechanics
Mohammed Y. Alsawalhi, Chad M. Landis
Summary: A new thermomechanical constitutive modeling approach is presented for shape memory alloys, which effectively captures the phase transformations and behaviors of the alloys using a single transformation surface and a transformation potential function.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
S. Choi, E. Choi, W. J. Kim
Summary: The study demonstrates that different combinations of recovery stress and recovery strain can be achieved by controlling grain size. The recovery stress and strains are also influenced by the accumulated plastic strain, with higher levels observed when the strain is small due to the training effect, and reduced levels when the strain is large from repeated cycles. Additionally, the higher recovery stress in the HRDSR-processed higher-carbon Fe-SMA compared to the present Fe-SMA is attributed to the smaller grain size caused by the presence of a higher density of carbides.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.