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monicajing銅蟲 (小有名氣)
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[交流]
E。 Ma近期Acta大塑性BMG作品
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Bulk metallic glasses with large plasticity: Composition design from the structural perspective Li Zhanga, Yong-Qiang Chengb, A-Jing Caob, Jian Xua, , and Evan Mab, , aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China bDepartment of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA Received 12 August 2008; revised 28 October 2008; accepted 1 November 2008. Available online 4 December 2008. Abstract While most bulk metallic glasses (BMGs) appear brittle at room temperature, appreciable compressive plastic strains have been observed for some glass compositions. The origin of this behavior is not understood, and the compositions of such plastic BMGs remain difficult to predict. Here we explain the plasticity observed in a Zr–Cu(Ni)–Al BMG, based on a computational analysis of the composition-dependent internal structures that influence shear transformations and shear localization behavior under loading. A strategy is then proposed to design BMG compositions with the desired local order for significant compressive plasticity, and is demonstrated by the successful discovery of an Hf62Ni25Al13 BMG capable of sustaining large compressive strains. The experimentally measured compressive strength, glass transition temperature and Poisson’s ratio, which are all composition dependent, are also shown to be macroscopic indicators that correlate well with the predictions from the atomic level structure. Keywords: Amorphous materials; Metallic glasses; Mechanical properties; Plastic deformation; Structure http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TW8-4V2PKG7-2-R&_cdi=5556&_user=2307902&_orig=browse&_coverDate=12%2F04%2F2008&_sk=999999999&view=c&wchp=dGLbVtb-zSkWb&md5=04778e5f3d60619445cfacce33e4c817&ie=/sdarticle.pdf [ Last edited by hslining on 2009-9-10 at 16:53 ] |
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