NiTi shape memory alloys (SMAs) have been extensively employed in civil, medical, and aerospace devices for their unique shape memory effect, pseudoelasticity, bio-compatibility, and corrosion resistance. Austenitic NiTi SMAs show higher stiffness (40-90 GPa) and more recoverable strains compared with martensitic NiTi SMAs (with stiffness of 20-70 GPa) [1]. Quasi-static and dynamic investigations have focused on either austenitic NiTi alloys [2] or martensitic NiTi SMAs at room temperature [3]. However, it is expected that the operating temperature will vary in many practical applications; thus, it is critical to study systematically the quasi-static and dynamic mechanical behavior of martensitic NiTi SMAs in both the martensitic phase (room temperature) and austenitic phase (above the austenitic finish temperature). In this study, we examined the mechanical behavior of martensitic NiTi SMAs under quasi-static and dynamic loading conditions using a screw-driven mechanical testing machine and a Kolsky compression bar system, respectively, at room temperature (martensitic phase) and above the austenitic finish temperature (austenitic phase).
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机译：NITI形状记忆合金（SMA）已广泛用于民用，医疗和航空航天装置，以实现其独特的形状记忆效果，假弹性，生物兼容性和耐腐蚀性。与马氏体NITI SMA（刚度为20-70GPa的刚度），奥氏体Niti SMA显示出更高的刚度（40-90GPa）和更高的可恢应菌株[1]。准静态和动态调查集中在室温下的奥氏体Niti合金[2]或马氏体Niti Smas [3]。但是，预计运行温度会在许多实际应用中变化;因此，在马氏体相（室温）和奥氏体相（高于奥氏体结束温度）中，系统地研究马氏体NITI SMA的准静态和动态力学行为至关重要。在这项研究中，我们在使用螺旋驱动的机械试验机和Kolsky压缩条系统下，在室温（马氏体相）和高于奥氏体表面上，检查了在准静态和动态负载条件下Martensitic NITI SMA的机械行为温度（奥氏体相）。
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