Temperature Effect on Stacking Fault Energy and Deformation Mechanisms in Titanium and Titanium-aluminium Alloy
Temperature Effect on Stacking Fault Energy and Deformation Mechanisms in Titanium and Titanium-aluminium Alloy
复制标题
DOI：
10.1038/s41598-020-60013-6
复制
发表时间：
2020-02
影响因子：
4.6
通讯作者：
Beikai Zhao;Peng Huang;Libo Zhang;Suzhi Li;Ze Zhang;Qian Yu
中科院分区：
文献类型：
--
作者：
Beikai Zhao;Peng Huang;Libo Zhang;Suzhi Li;Ze Zhang;Qian Yu
合金元素对金属的力学性能有很大的影响。结合位错表征和原位透射电镜在环境和液氮温度下对高纯钛和Ti-5at%Al的应变，研究了温度变化对Al位错行为的调节。结果表明，在Ti-5at%Al中，Al在边缘位错核处的偏析产生了强大的障碍，促进了室温交叉滑移。然而，随着温度的降低，铝对降低堆错能（SFE）的作用显著。因此，在液氮温度下，Ti-5at%Al中较低的SFE导致了普通的平面位错滑移，而Ti中出现了大量的位错交叉滑移。
Alloying elements have great influence on mechanical properties of metals. Combining dislocation characterization andin-situtransmission electron microscope straining at ambient and liquid-nitrogen temperature in high-purity titanium and Ti-5at%Al, we investigated the modulation of Al on dislocation behaviours as temperature changed. It reveals that segregation of Al at edge dislocation cores in Ti-5at%Al generates strong obstacles, promoting room temperature cross-slips. However, the effect of Al on reducing stacking-fault energy (SFE) as decreasing temperature is significant. Consequently, the lower SFE in Ti-5at%Al results in ordinary planar dislocation slip while massive dislocation cross-slips occurred in Ti at liquid-nitrogen temperature.