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Improving the plasticity of bulk metallic glasses via pre-co

已有 3769 次阅读 2014-2-28 16:43 |个人分类:非晶前沿|系统分类:论文交流

Improving the plasticity of bulk metallic glasses via pre-compression below the yield stress


  • a State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

  • b School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia

  • c Faculty of Materials and Energy, Southwest University, Chongqing 400715, China


Abstract


The poor plasticity of bulk metallic glasses (BMGs) has severely limited their potential structural applications. In this paper, we reported that uniaxial pre-compression below the yield stress can be used to significantly improve the plasticity of BMGs. An as-cast Cu36Zr48Al8Ag8 BMG was pre-compressed under various pressures (400, 800 and 1600 MPa) and durations (30, 60 and 120 minutes). The pre-compression processes led to structural change that increases the free volume and produces nanocrystals in the BMG matrix, which subsequently improved the plasticity of the BMG. Detailed data analysis showed that increasing the applied pressure speeds up the structural relaxation process and nanocrystallization occurs only at high enough pressure. This investigation indicated that appropriate selection of the pressure and duration of a pre-compression process is critical for the improved plasticity of BMGs.

Keywords

  • Bulk metallic glasses; Pre-compression; Plasticity; Free volume; Nanocrystallite


http://www.sciencedirect.com/science/article/pii/S0921509314002184




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