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非晶文献快递之Localized deformation of a 。。。
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J. Phys. D: Appl. Phys. 42 (2009) 065401 mmse @ 2009-02-26 09:38 Localized deformation of a Cu46.25Zr45.25Al7.5Er1 bulk metallic glass Fuqian Yang1, Ding Li1, Mimi X Yang2, Ran Li4, Wenhui Jiang3, Gongyao Wang3, Tao Zhang4 and Peter K Liaw3 1 Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA 2 MSTC Program, Paul Laurence Dunbar High School, Lexington, KY 40513, USA 3 Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37994, USA 4 Department of Materials Science and Engineering, Beijing University of Aeronaut & Astronaut, Beijing 100083, People's Republic of China E-mail: fyang0@engr.uky.edu Abstract. Using the cavity model and the concept of the plastic-hardening modulus, a simple relationship was established between the size of an indent and the size of a semi-spherical-shell softening zone. Indentation experiments of a Cu46.25Zr45.25Al7.5Er1 bulk-metallic glass (BMG) were performed over a range of indentation loads from 500 to 4000 mN, using a Vickers indenter. The indentation hardness decreased slightly with the increase in the indentation load from 5.21 GPa at an indentation load of 500 mN to 4.66 GPa at an indentation load of 4000 mN. The evolution of shear bands underneath the indentation was studied using an interface-bonded BMG sample. Shear bands of a semi-spherical-shell shape and a line-shape were observed underneath the indentation. The dependence of the size of the shear-banding zone on the size of the indent was examined, which qualitatively supported the analytical model. The inter-banding spacing decreased with the increase in the indentation load, associated with the release of the stored strain energy. Print publication: Issue 6 (21 March 2009) Received 11 September 2008, in final form 8 December 2008 Published 25 February 2009 http://www.iop.org/EJ/article/0022-3727/42/6/065401/d9_6_065401.pdf [ Last edited by hslining on 2009-9-10 at 15:43 ] |
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