Improvement in mechanical properties of a Zr-based bulk metallic glass by laser surface treatment

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• 作者：Bingqing Chen ; Shujie Pang ; Peipei Han ; Yan Li ; Alain R. Yavari ; Gavin Vaughan ; Tao Zhang
• 关键词：Metallic glasses ; Laser processing ; Mechanical properties ; Synchrotron radiation
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：504
• 期：Supplement 1
• 页码：S45-S47
• 全文大小：255 K

文摘

In this work, surface modification of Zr₅₅Cu₃₀Al₁₀Ni₅ bulk metallic glass for improving the mechanical properties was carried out by employing laser surface melting (LSM) treatment. The structures and thermal properties of the as-cast and LSM treated samples were characterized with high energy synchrotron diffraction and differential scanning calorimeter, respectively. After the laser surface remelting, the Zr₅₅Cu₃₀Al₁₀Ni₅ alloy still consisted of fully amorphous structure. In comparison to the as-cast Zr-based alloy without distinct plasticity, the LSM treated one exhibited compressive plastic strain of 5.3 % prior to fracture. The improvement in mechanical behavior of the LSM treated metallic glass may be resulted from complex residual stress distributions and increase in free volume in the surface layer induced by LSM treatment.