Effect of pouring temperature on thixotropic microstructure formation of AZ91
来源期刊：Rare Metals2007年第S1期
论文作者：NING Zhiliang),WU Peilian),Wang H.),CAO Fuyang),and SUN Jianfei)) School of Materials Science & Engineering,Harbin Institute of Technology,Harbin ,China ) Faculty of Engineering & Surveying,University of Southern Queensland,Toowoomba,Queensland ,Australia
文章页码：180 - 184
摘 要：The effect of pouring temperature on thixotropic microstructure of AZ91 was investigated.The results show that the pouring temperature has a pronounced effect both on microstructural morphology and grain size.By decreasing the pouring temperature,the morphology of grains changes from coarse dendritic to fine dendritic structure.The fine dendritic structure that was obtained at low pouring temperature developed into a globular structure with a grain size of 60 μm,if the AZ91 was partially remelted and held isothermally at the semisolid state(575 ℃).On the other hand,if the alloy was poured at a high superheat,the particles were irregular and interconnected with a grain size of 180 μm even after 20 min of isothermal holding.
NING Zhiliang1),WU Peilian1),Wang H.2),CAO Fuyang1),and SUN Jianfei1)1) School of Materials Science & Engineering,Harbin Institute of Technology,Harbin 150001,China 2) Faculty of Engineering & Surveying,University of Southern Queensland,Toowoomba,Queensland 4350,Australia
摘 要：The effect of pouring temperature on thixotropic microstructure of AZ91 was investigated.The results show that the pouring temperature has a pronounced effect both on microstructural morphology and grain size.By decreasing the pouring temperature,the morphology of grains changes from coarse dendritic to fine dendritic structure.The fine dendritic structure that was obtained at low pouring temperature developed into a globular structure with a grain size of 60 μm,if the AZ91 was partially remelted and held isothermally at the semisolid state(575 ℃).On the other hand,if the alloy was poured at a high superheat,the particles were irregular and interconnected with a grain size of 180 μm even after 20 min of isothermal holding.
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