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首页> 外文会议>ICNFM 2007;International Workshop on Nonferrous Materials >Effect of pre-deformation on aging characteristics and mechanical properties of Mg-Gd-Nd-Zr alloy
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Effect of pre-deformation on aging characteristics and mechanical properties of Mg-Gd-Nd-Zr alloy

机译：预变形对Mg-Gd-Nd-Zr合金时效特性和力学性能的影响

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The effect of plastic deformation prior to artificial aging on the aging characteristics and mechanical properties of a Mg-11Gd-2Nd-0.5Zr (mass fraction,%) alloy was investigated.After solution treatment at 525 °C for 4 h,the alloy was subjected to cold stretching deformation of 0%,5% and 10%,respectively.The as-deformed specimens possess high density of dislocations and mechanical twins,which increase with elevated deformation.As compared with non-stretched alloy,the stretched alloy shows accelerated age-hardening response and slightly enhanced peak hardness when aged at 200 °C.Comparison of the microstructures in undeformed and deformed specimens after 200 °C,24 h aging reveals that pre-deformation induces the heterogeneous nucleation of precipitations at dislocations and twin boundaries in addition to the homogeneous precipitation in the matrix.Room and high temperature tensile test results show that pre-deformation enhances the strength of the alloy,especially at room temperature,though the ductility declines.The improvement in strength of deformed and aged alloy is attributed to the combined strengthening effect of precipitates,deformation structures and grain boundaries.
机译：研究了人工时效前塑性变形对Mg-11Gd-2Nd-0.5Zr（质量分数，％）合金时效特性和力学性能的影响。在525°C固溶处理4 h后，合金变形后的试样具有高的位错密度和机械孪晶，随着变形量的增加而增加。与未拉伸的合金相比，拉伸后的合金表现出加速的变形。 200°C时效时的时效硬化响应和峰值硬度略有增强.200°C 24 h时效后未变形和变形试样的显微组织比较表明，预变形会引起位错和孪晶边界处析出的异质形核。室温和高温拉伸试验结果表明，预变形增强了合金的强度，特别是在室温下，t变形和时效合金的强度提高归因于析出物，变形结构和晶界的综合强化作用。

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