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首页> 外文期刊>Shape memory and superelasticity >SMST2019: Effect of Temperature on the Fracture Toughness of a NiTiHf High Temperature Shape Memory Alloy
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SMST2019: Effect of Temperature on the Fracture Toughness of a NiTiHf High Temperature Shape Memory Alloy

机译：SMST2019：温度对NITIHF高温形状记忆合金的断裂韧性的影响

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摘要

The fracture toughness of Ni_(50.3)Ti_(29.7)Hf_(20) high temperature shape memory alloy was systematically investigated as a function of temperature. A set of nominally isothermal fracture toughness tests were conducted on disk-shaped compact tension specimens at five temperatures corresponding to three thermodynamical conditions: (i) below martensite finish temperature to obtain the fracture toughness of martensite (ii) above martensite start temperature in austenite but below the martensite desist temperature (M_d, the temperature above which the austenite does not transform), in order to find the fracture toughness when stress induced martensitic (SIM) transformation takes place close to the crack tip, and (iii) above M_d, in order to obtain the fracture toughness of austenite. The extent of the inelastic zone near the crack tip was detected using digital image correlation, and the fracture surfaces were examined. The fracture behavior was highly temperature/phase dependent. The fracture toughness of the transforming material was higher than that of austenite and martensite, i.e. SIM transformation acts as a toughening mechanism. This was attributed to the differences in strain hardening behavior in detwinning, martensitic transformation, and plastic deformation regimes of the stress-strain response, where SIM transformation occurs with the lowest strain hardening rate. The fracture toughness values obtained here are lower than those of equiatomic NiTi.
机译：作为温度的函数，系统地研究了Ni_（50.3）Ti_（29.7）的裂缝韧性HF_（29.7）HF_（20）的高温形状记忆合金。在对应于三个热力学条件的五个温度下进行一组名义上是等温裂缝韧性试验：（i）在马氏体净化温度以下，以获得奥氏体中马氏体的马氏体（II）的断裂韧性，但是低于马氏体停止温度（M_D，高于奥氏体不会变换的温度），以便在应激诱导的马氏体（SIM）变换靠近裂纹尖端的裂缝（SIM）变换时，（III）在M_D上方发生裂缝韧性为了获得奥氏体的断裂韧性。使用数字图像相关检测裂纹尖端附近的无弹性区域的程度，并且检查了断裂表面。骨折行为是高温/相位的依赖性。转化材料的断裂韧性高于奥氏体和马氏体的骨折韧性，即SIM转化作为增韧机制。这归因于应力 - 应变反应的脱绒，马氏体变换和塑性变形制度中应变硬化行为的差异，其中SIM转化以最低应变硬化速率发生。这里获得的断裂韧性值低于赤脂乳氏菌。

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