室温压缩流变行为的影响
(1. 中国科学院 金属研究所,沈阳 110016;
2. 西北有色金属研究院 钛合金研究所,西安 710016;
3. 中国科学院 研究生院,北京 100039)
摘 要: 研究Ti-xNb-0.7Ta-2Zr-1.4O(x=22.4,22.85,24.5)钛合金的室温压缩流变行为。结果表明:合金的真应力—真应变曲线上塑性变形阶段均表现出应力振动现象,即应变硬化和应变软化交替出现,应力振动是由压缩过程中占主导地位的变形机制发生变化所引起的。随着合金中Nb含量的升高,塑性变形初始阶段的应力平台阶段消失,应变软化阶段缩短,应力软化值减小。这种现象是由于Nb含量的变化改变了合金的塑性变形机制所致。
关键字: 钛合金;压缩;流变行为;变形机制
Ti-Nb-0.7Ta-2Zr-1.4O alloy during cold compression
(1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. Titanium Alloy Research Centre, Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China)
Abstract:The flow behaviors of Ti-xNb-0.7Ta-2Zr-1.4O (x=22.4, 22.85, 24.5) alloys during room-temperature compression were investigated. The results show that the true stress—strain curve exhibits stress oscillation phenomenon characterized by alternate strain hardening and softening, which is caused by a change in the dominant deformation mechanisms. With increasing the Nb content, the stress plateau at the initial stage of plastic deformation disappears, and the strain softening stage and stress softening value decrease, which results from the change of deformation mechanism.
Key words: titanium alloy; compression; flow behavior; deformation mechanism