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linying099

铜虫 (小有名气)

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注册: 2009-08-04
专业: 金属材料的制备科学与跨学

[交流] 【原创】ACTA MATERIALIA最新BMG文章

Microstructural heterogeneities governing the deformation of Cu47.5Zr47.5Al5 bulk metallic glass composites
S. Paulya, , , G. Liub, G. Wanga, U. Kühna, N. Matterna and J. Eckerta, c

aIFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany

bState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China

cInstitut für Werkstoffwissenschaft, Technische Universität Dresden, D-01062 Dresden, Germany

Received 17 June 2009; accepted 24 July 2009. Available online 22 August 2009.

Abstract
Cu47.5Zr47.5Al5 rods with different volume fractions of crystalline B2 CuZr phase were prepared by copper mould casting. Based on microstructural investigations a solidification mechanism is proposed for these bulk metallic glass (BMG) composites. The composite microstructure enhances the compressive plasticity (plastic strain up to 14%) and both plastic strain as well as yield strength scale with the crystalline volume fraction. Yield strength and fracture strain were successfully calculated using a strength model, which considers percolation and an empirical three microstructural element body approach, respectively. Furthermore, B2 CuZr was synthesized by means of a thermal cycling treatment and uniaxial compression tests were carried out at room temperature. The intrinsic work-hardenability caused by a martensitic transformation has strong implications on the deformation behaviour of the investigated Cu47.5Zr47.5Al5 BMG composites.

Keywords: Rapid solidification; Compression test; Bulk amorphous alloys; Shape memory alloys; Plastic deformation
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TW8-4X2F74N-1&_user=1021771&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050170&_version=1&_urlVersion=0&_userid=1021771&md5=fc675210a3bedb70566d47920d355005

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