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摘要：
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对Al-3%Si的SIMA(Strain Induced Melt Activation-应变诱发熔化激活)半固态成形方法的组织演变过程进行了研究,以便为铝合金部件的SIMA半固态成形提供理论指导。研究结果表明:经压缩变形后的Al-3%Si合金在保温过程中的组织经过形状大小不同的多边形晶粒、均匀的粒状组织、球化组织最后演变为粗化颗粒。压缩形变量越大,半固态等温保温后,晶粒平均等积圆直径越小,球化程度越高。但是压缩形变量超过50%后,晶粒等积圆直径变化不大。随着半固态等温保温时间的延长,晶粒平均等积圆直径逐渐增大,圆度呈增加趋势,保温60到90 min时,圆度基本趋于常数。
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The microstructure evolution of SIMA (Strain Induced Melt Activation) semi solid state forming method for Al-3%Si was studied so as to provide a theoretical instruction for processing the aluminum alloy components by SIMA semi solid state forming process.After plastic deformation,the microstructure evolved into coarse grains from polygon grain,uniformed granule and globular grains.The research results show that the more amount of deformation is,the smaller averaged diameter and the higher roundness are after heat holding.But when the ration of plastic deformation is more than 50%,the diameter could hardly change.The longer the time of heat holding is,the bigger the diameter of the grain and the higher roundness are.The roundness will almost remain the same when the time of heat holding is between 60min and 90min.
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作者简介：
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参考文献：
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