固溶态Ti-41Nb合金的微观组织与力学行为研究  

Study on Microstructure and Mechanical Behavior of Solution treated Ti-41Nb Alloy

作　　者：侯艳嫔 柳青 郭顺[1] 沈宝国 师平 谢中敏 张慧慧 吴亭慧 Hou Yanpin;Liu Qing;Guo Shun;Shen Baoguo;Shi Ping;Xie Zhongmin;Zhang Huihui;Wu Tinghui(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Youke Publishing Co.,Ltd,GRINM Group,Beijing 100088,China;Jiangsu Aviation Technical College,Zhenjiang 212134,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]有研科技集团有科期刊出版(北京)有限公司,北京100088 [3]江苏航空职业技术学院,江苏镇江212134

出　　处：《稀有金属材料与工程》2021年第9期3213-3217,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51771082);镇江市科技计划项目(GY2020001)。

摘　　要：采用光学显微镜、力学性能测试和原位同步辐射高能X射线衍射等方法系统地研究了固溶态Ti-41Nb合金的微观组织与力学行为。结果表明,Ti-41Nb合金经800℃固溶淬火处理后,其等轴β基体上分布着微量的板条状α″马氏体,呈现典型的双相结构。在拉伸过程中,固溶态Ti-41Nb合金除发生弹性变形外,还发生了β→α″应力诱发马氏体相变。应力诱发马氏体相变在0.0%~3.3%应变范围内较剧烈,在3.3%~4.0%应变范围内相对轻微。在随后的卸载过程中,固溶态Ti-41Nb合金发生了弹性回复,同时伴随着α″→β逆马氏体相变。卸载后,固溶态Ti-41Nb合金中仍有大量的α″马氏体未转变为β母相,这导致合金仍有2.9%的残余应变。The microstructure and mechanical behavior of solution treated Ti-41 Nb alloy were systematically investigated by optical microscope,tensile test and in situ synchrotron high-energy X-ray diffraction. The results show that after solution treatment at 800 ℃ +water quenching,Ti-41 Nb alloy presents a typical dual-phase structure which is characterized by exiguous lath-shaped α? martensite distributed on the equiaxed β matrix. The stress induced martensitic transformation(SIMT), together with elastic deformation, takes place concurrently during loading. The stress-induced martensitic transformation from β to α″ takes place intensively in the strain range from 0.0% to 3.3% but slightly from 3.3% to 4.0%.In the subsequent unloading process, the solution treated Ti-41 Nb alloy undergoes elastic recovery, accompanied by the reverse martensitic transformation from α″ to β. After unloading, a large amount of α″ martensite is not transformed into β parent phase, which results in a residual strain of 2.9% in the alloy.

关 键 词：Ti-Nb合金 应力诱发马氏体相变 力学行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]