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非晶文獻快遞之Dual specimen-size dependences ．．．
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Materials Science and Engineering: A - Article in Press, Accepted Manuscript mmse @ 2009-02-26 14:17 Dual specimen-size dependences of plastic deformation behavior of a traditional Zr-based bulk metallic glass in compression L. Hea, Z.H. Hana, M.B. Zhonga and Y.L. Houa aState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China Received 6 December 2008; revised 3 February 2009; accepted 10 February 2009. Available online 21 February 2009. Abstract The plastic deformation behavior of a traditional BMG with the composition of Zr65Cu17.5Ni10Al7.5 was investigated in compression using the precursory-specimens with different casting sizes and hence different initial states. With increasing the mechanical-testing size of specimen, it is demonstrated that more pronounced action of elastic-recoveries of testing machine and specimen led to a decrease of plasticity because of larger shear-strain was introduced in shear bands. Furthermore, for the specimens with the same mechanical-testing size, initial free-volume reduction with increasing the casting size of precursory-specimen also led to a degradation of plasticity as higher free-volume was required for higher shear-band emission rate. Even the traditional BMG can be ductile as the casting size and mechanical-testing size of specimen were concurrently decreased to a certain extent. The understanding of the dual specimen-size dependences of plastic deformation capability of BMGs is helpful for the potential and reasonable engineering applications of BMGs. Keywords: Bulk metallic glasses; Plastic deformation; Shear bands; Free-volume; Specimen-size effect http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TXD-4VNK69K-3&_user=2307902&_coverDate=02%2F21%2F2009&_alid=873641016&_rdoc=1&_fmt=high&_orig=search&_cdi=5588&_sort=d&_docanchor=&view=c&_ct=27&_acct=C000056862&_version=1&_urlVersion=0&_userid=2307902&md5=c197718713d9bdc22ca2c3112e115c8b [ Last edited by hslining on 2009-9-10 at 15:42 ] |
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