基于DIC方法的TC4钛合金高温拉伸试验  

High temperature tensile test of TC4 titanium alloy based on digital image correlation method

作　　者：杨洋 孙炜 王亮 王翔 郭广平 YANG Yang;SUN Wei;WANG Liang;WANG Xiang;GUO Guang-ping(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation,Aero Engine Corporation of China,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]航空材料检测与评价北京市重点实验室,北京100095 [3]中国航空发动机集团材料检测与评价重点实验室,北京100095

出　　处：《材料热处理学报》2021年第2期44-51,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(11672279);基础性军工科研院所稳定支持项目(KZ0C190726)。

摘　　要：通过搭建基于DIC方法的高温拉伸试验系统,结合材料力学测试技术,开展了TC4钛合金高温拉伸试验,获得了TC4钛合金在23、100、200、250、300和350℃下的拉伸性能和应力-应变曲线等数据。结果表明:TC4钛合金的抗拉强度、条件屈服强度和弹性模量随着试验温度的升高而不断降低,350℃时其保持率分别为68.9%、61.4%和78.6%。同时,TC4钛合金塑性随温度升高整体表现为增大趋势,说明TC4钛合金具有较好的塑性和耐温性能。通过扫描电镜观察了拉伸试样的断口形貌,结合试验结果,探讨了温度与断口形貌之间的关系。最后,通过试验验证了高温拉伸试验系统及相关试验方法的可行性和可靠性。By establishing a high-temperature tensile test system based on digital image correlation(DIC) method and combining with the material mechanics test technology, the high-temperature tensile test of TC4 titanium alloy was carried out, and the tensile properties and stress-strain curves of the TC4 titanium alloy at 23 ℃, 100 ℃, 200 ℃, 250 ℃, 300 ℃ and 350 ℃ were obtained. The results show that the tensile strength, yield strength and elastic modulus of the TC4 titanium alloy decrease with the increase of the test temperature, and the retention rates at 350 ℃ are 68.9%, 61.4% and 78.6%, respectively. Meanwhile, the plasticity of the TC4 titanium alloy increases with the increase of the test temperature, which indicates that the TC4 titanium alloy has better plasticity and temperature resistance. The fracture surface morphology of tensile specimen is observed by scanning electron microscopy, and the relationship between temperature and fracture surface morphology is discussed. Finally, the feasibility and reliability of high temperature tensile test system and related test methods are verified by experiments.

关 键 词：TC4钛合金 DIC方法 高温拉伸 断口形貌 

分 类 号：TG146.2[一般工业技术—材料科学与工程]