材料科学
钛
层错能
液氮
铝
位错
打滑(空气动力学)
叠加断层
透射电子显微镜
合金
钛合金
冶金
堆积
变形(气象学)
复合材料
热力学
纳米技术
化学
有机化学
物理
作者
Beikai Zhao,Ping Huang,Libo Zhang,Suzhi Li,Ze Zhang,Qian Yu
标识
DOI:10.1038/s41598-020-60013-6
摘要
Abstract Alloying elements have great influence on mechanical properties of metals. Combining dislocation characterization and in-situ transmission 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.
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