Advances in Transmission Electron Microscopy: In Situ Straining and In Situ Compression Experiments on Metallic Glasses

被引:33
作者
De Hosson, Jeff Th. M. [1 ,2 ]
机构
[1] Univ Groningen, Netherlands Inst Met Res, Dept Appl Phys, NL-9747 AG Groningen, Netherlands
[2] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands
关键词
in situ straining; in situ compression; crack nucleation; crack propagation; metallic glasses; shear bands; DUCTILE SHEAR FAILURE; MECHANICAL-PROPERTIES; TENSILE FRACTURE; FORMING ABILITY; GRAIN-BOUNDARY; BULK; DEFORMATION; TEMPERATURE; BAND; TI;
D O I
10.1002/jemt.20678
中图分类号
R602 [外科病理学、解剖学]; R32 [人体形态学];
学科分类号
100101 ;
摘要
In the field of transmission electron microscopy (TEM), fundamental and practical reasons still remain that hamper a straightforward correlation between microscopic structural information and deformation mechanisms in materials. In this article, it is argued that one should focus in particular on in situ rather than on postmortem observations of the microstructure. This viewpoint has been exemplified with in situ straining and in situ compression studies on metallic glasses. In situ TEM straining of amorphous metals permits an evaluation of the thickness of the liquid-like layer (LLL) formed because of heat evolution after shear band development. The experimental evaluation confirms that the thickness of a LLL present at the last moment of fracture substantially exceeds the generally accepted thickness of a shear band. In situ TEM and in situ SEM compression experiments on metallic glass pillars lead to the conclusion that smaller sized pillars deform more homogeneously than larger sized pillars. Microsc. Res. Tech. 72:250-260, 2009. (C) 2009 Wiley-Liss. Inc.
引用
收藏
页码:250 / 260
页数:11
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