In situ atomistic deformation mechanisms of twin-structured nanocrystal Pt

In situ atomistic deformation mechanisms of twin-structured nanocrystal Pt
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双结构纳米晶Pt的原位原子变形机制

DOI:
10.1016/j.scriptamat.2018.01.012
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发表时间:
2018-04
期刊:
影响因子:
6
通讯作者:
Han Xiaodong
Han Xiaodong
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang Lihua;Teng Jiao;Kong Deli;Yu Guanghua;Zou Jin;Zhang Ze;Han Xiaodong

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利用自制的高分辨透射电子显微镜装置,对孪晶结构的Pt(d= ~25 nm)纳米晶进行了原子尺度的原位拉伸实验。我们发现,双晶结构的Pt纳米晶体表现出高达21.9%的均匀伸长率裂纹出现之前。原子尺度和时间分辨的原位研究表明,与共格孪晶界(TB)相交的全部位错和部分位错,以及部分位错在TB附近滑移引起的TB迁移,以及非共格TB的快速迁移都有助于孪晶结构纳米晶体的大的均匀延伸能力。
The atomic-scalein situtensile tests of twin-structured Pt (d= ~25 nm) nanocrystals were conducted using a home-made device in a high-resolution transmission electron microscope. We showed that the twin-structured Pt nanocrystals exhibit as large as 21.9% homogeneous elongation before crack emergence. The atomic-scale and time-resolvedin situinvestigation indicated that, full and partial dislocations that intersect with coherent twin boundaries (TBs), as well as TB migration resulting from partial dislocations glide adjacent to the TBs, and the rapid migration of incoherent TBs all contribute the large homogeneous elongation capability of the twin-structured nanocrystals.
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