Experimental Investigation of the Effects of Aging and Cryogenic Treatments on the Mechanical Properties of Superelastic Nickel-Titanium Shape-Memory Alloys

材料科学 钛镍合金 形状记忆合金 极限抗拉强度 金属间化合物 复合材料 冶金 断口学 钛合金 拉伸试验 形状记忆合金* 假弹性 合金 微观结构 马氏体 组合数学 数学
作者
Sedat Guven,Meltem Altin Karataş,Hasan Gökkaya,Yuksel Akinay
出处
期刊:Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science [SAGE]
卷期号:: 095440622110698-095440622110698
标识
DOI:10.1177/09544062211069864
摘要

In this study, electropolishing and two different heat treatments were applied to wires made of superelastic nickel-titanium (NiTi) shape-memory alloy (SMA) and their mechanical properties and stress-induced deformations were investigated. In experimental studies, cryogenic and aging heat treatments were applied to NiTi SMA wire samples and tensile test experiments were carried out to determine the effect of the heat treatments on their mechanical properties. Following the tensile test experiments conducted at room temperature (23 °C), the study investigated changes in the elemental composition, fracture modes, micro cracks, and phase structures and in the mechanical properties formed in the fracture region. Intermetallic phase structures (Ti2Ni, Ni3Ti, and Ni4Ti3) were observed in the X-ray diffraction (XRD) analyses. It was concluded that the aging heat treatment had directly affected the reduction in hardness. In particular, in samples without the aging heat treatment, a stress-induced decrease in the Ni and Ti ratios and an increase in the carbon (C) ratio were observed in the the chemical composition of the fracture surface of the superelastic NiTi SMA wires. It was determined that the changes in the chemical composition caused by stress had affected the mechanical properties negatively. In the fractography of the NiTi SMA wires, the samples exhibited mostly ductile fracture behavior with small dimples.
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