Designing ductile CuZr-based metallic glass matrix composites

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• 作者：Y.J. Liu^a ; H.W. Yao^a ; ^b ; T.W. Zhang^c ; Z. Wang^a ; ^b ; Y.S. Wang^a ; ^b ; J.W. Qiao^a ; ^b ; ^{qiaojunwei@gmail.com} ; H.J. Yang^a ; ^b ; ^{pineyang@126.com} ; Z.H. Wang^c
• 关键词：Metallic glasses ; Composites ; Work-hardening ; Microstructure ; Martensitic phase transformation
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：542-549
• 全文大小：2798 K
• 卷排序：682

文摘

The CuZr-based metallic glass matrix composites (MGMCs) with different volume fractions of crystalline phases were designed by doping of nickel. Minor addition of nickel element can change the glass-forming ability of the resultant composites. Large compressive plasticity accompanied by strong work-hardening capacity was achieved in the Cu47Zr48Al4Ni1 composite with a volume fraction of crystalline phases of 33%. The excellent compressive properties were mainly attributed to the inhibition for the propagation of shear bands by the ductile crystals and deformation induced martensitic transformation of the B2-CuZr phase. However, no obvious global tensile ductility was obtained, due to the mode I fracture toughness and small plastic-zone size of glass matrix. To uncover the shear-band evolution during deformation, finite element simulation was conducted, revealing that the ductile B2 phase can tune the shear-stress distribution and consequently initiate and retard shear bands, which stimulates the multiplication of shear bands. Accordingly, the spacing of B2 CuZr particles is a vital factor dominating the plasticity of CuZr-based MGMCs, especially upon tension.