(西北有色金属研究院 金属多孔材料国家重点实验室，西安 710016)
摘 要: 综合利用力学测试平台、数字图像相关技术、X射线衍射分析、扫描电子显微观察等方法研究Ti-28%Ta合金的显微组织和拉伸性能，并对断口显微形貌进行分析。结果表明：Ti-28%Ta合金微观组织由主要的β相和少量的α″马氏体相组成；通过对Ti-28%Ta合金的拉伸性能分析，并结合循环往复拉伸测试实验，表明Ti-28%Ta具有优异的超弹性和塑性(断裂时的应变量为28%)；通过对断口分析，证实Ti-28%Ta合金的断裂方式为韧性断裂。
关键字: 超弹性；马氏体相变；TiTa合金；拉伸性能；数字图像相关技术
（State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The mechanical testing platform, digital image correlation technology, X-ray diffraction analysis and scanning electron microscopy were used to study the microstructure and tensile properties of Ti-28%Ta alloy, and the fracture morphologies were analyzed. The results show that the microstructure of Ti-28%Ta alloy is composed of main β phase and a small amount of α″ martensite phase. The tensile properties of Ti-28%Ta alloys and cyclic tensile tests show that Ti-28%Ta alloys have excellent superelasticity and plasticity (fracture elongation is 28%). The fracture analysis proves that Ti-28%Ta alloys have excellent superelasticity and plasticity. The fracture mode is ductile fracture.
Key words: superelasticity; martensitic phase transformation; TiTa alloy; tensile property; digital image correlation
