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在SEM和TEM中的原位微米和纳米压缩试验(In-situ Micro- and Nano-Compression)
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The recent development of the micro- and nano-compression testing inside SEM and TEM on miniaturized samples with diameter varying from 100 nm to 50 um allows for a direct assessment of mechanical properties at such size scale. Original work on nickel [1] micro-pillars and gold nano-pillars [2] has clearly demonstrated that single crystalline metallic micro- and nano-structures considerably outperform their macroscopic counterparts in strength. Following these pioneering works, a wide range of single-crystalline metallic micro-pillars has been investigated[3-7]. The thorough review by Uchic et al. [8] detailed the experimental and numerical study of the micro-compression behavior of mostly micron sized FCC pillars, while a recent review by Greer et al. [9] provides a broader perspective by including studies on other materials system and sub-micron sized specimens. Both the FCC and BCC metals display a power-law like strengthening in micron and sub-micron scale, however, the associated physical mechanisms are distinct from one another. With extensive experimental and computational work, this phenomenon has been explained based on ddislocation-based mechanisms. For the FCC metals, dislocation starvation, followed by the surface nucleation, is responsible for the superior strength; while for the BCC metals, the relative mobility of screw- vs. edge-components of dislocations leads to multiplication and dislocation debris formation, which contributes to such high strength [4-9]. [1] M. D. Uchic et al., Science, 305 (2004) 986. [2] J. R. Greer et al., Acta Mater. 53 (2005) 1821. [3] D. M. Dimiduk et al., Acta Mater., 53 (2005) 4065. [4] A M Minor et al., Nature Mater. 5 (2006) 697. [5] Z. W. Shan et al., Nat Mater., 7 (2007) 115. [6] H Bei et al., Acta Mater., 56 (2008) 4762-4770. [7] S. W. lee et al., Acta Mater., 57 (2009) 4404-4415. [8] M. D. Uchic et al., Annu. Rev. Mater. Res., 39 (2009) 361. [9] J. R. Greer and J T M de Hosson. Prog. Mater. Sci., (2011). MD Uchic和JR Greer都是在斯坦福大学著名教授WD Nix教授指导下拿的博士学位，他们的原创性结果激发了世界各国研究人员的兴趣，不少课题组对这个领域进行了跟踪研究。 以上为个人撰写的文章引言的部分内容。附件中主要就是MD Uchic和JR Greer原创性文章及他们独自撰写的综述。[ Last edited by bingan727 on 2012-1-5 at 20:37 ] |
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本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : 1 Micro-compression of Ni micro-pillars (MD Uchic).pdf
- 附件 2 : 2 Nanocompression of Au nanopillars.pdf
- 附件 3 : 3 Micro-compression of FIB-free Mo micropillars.pdf
- 附件 4 : 4 Extensive review by MD Uchic.pdf
- 附件 5 : 5 Extensive review by JR Greer.pdf
2012-01-04 15:41:56, 375.87 K
2012-01-04 15:44:41, 444.24 K
2012-01-04 15:44:44, 502.5 K
2012-01-04 15:45:39, 4.53 M
2012-01-04 15:49:24, 6.73 M
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