Enhanced tensile properties in a Mg-6Gd-3Y-0.5Zr alloy due to hot isostatic pressing（HIP）
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：B.Zhou D.Wu R.S.Chen En-hou Han
文章页码：1860 - 1868
摘 要：Hot isostatic pressing（HIP） was applied to Mg-6 Gd-3 Y-0.5 Zr（GW63） alloy to reduce shrinkage porosity,thus, to enhance the integrity and reliability of castings. During HIP process, shrinkage porosity was closed by grain compatible deformation and subsequent diffusion across the bonding interface. The amount of initial shrinkage porosity was the key factor for shrinkage porosity closure. HIP was testified to be effective on shrinkage porosity reduction in GW63 alloy due to its relatively narrow solidification range and resultant low content of initial shrinkage porosity in most sections, leading to higher tensile properties both in as-cast and cast-T6 condition. The improvement in tensile properties was mainly because of shrinkage porosity reduction and resultant effective rare-earth（RE） elements homogenization and precipitation strengthening.
B.Zhou1,2，D.Wu1，R.S.Chen1，En-hou Han1
1. The Group of Magnesium Alloys and Their applications, Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, University of Science and Technology of China
摘 要：Hot isostatic pressing（HIP） was applied to Mg-6 Gd-3 Y-0.5 Zr（GW63） alloy to reduce shrinkage porosity,thus, to enhance the integrity and reliability of castings. During HIP process, shrinkage porosity was closed by grain compatible deformation and subsequent diffusion across the bonding interface. The amount of initial shrinkage porosity was the key factor for shrinkage porosity closure. HIP was testified to be effective on shrinkage porosity reduction in GW63 alloy due to its relatively narrow solidification range and resultant low content of initial shrinkage porosity in most sections, leading to higher tensile properties both in as-cast and cast-T6 condition. The improvement in tensile properties was mainly because of shrinkage porosity reduction and resultant effective rare-earth（RE） elements homogenization and precipitation strengthening.
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