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铸轧对半固态镁合金组织的影响

The effect of casting-rolling for semi-solid Magnesium alloys on the microstructure

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【作者】 张颂阳耿茂鹏张莹王艳春谢水生周新民

【Author】 ZHANG Song-yang~1 GENG Mao-peng~2 ZHANG Ying~5 WANG Yan-chun~6(Machinical and Electrical School,Nanchang University,Nanchang 330029 China)XIE Shui-sheng~3(Beijing General Research Institute for Non-ferrous Metal,Beijing 100088 China)ZHOU Xin-min~4(China National Nonferrous Metals Industry Techno-economic Institute,Beijing 100088 China)

【机构】 南昌大学机电学院北京有色金属研究总院有色金属材料制备加工国家重点实验室北京有色金属技术经济研究总院 南昌330029南昌330029北京100083北京

【摘要】 实验研究了镁合金半固态铸轧的组织。铸轧试验是在一台自制的铸轧试验机上进行。试验结果表明,铸轧对半固态镁合金组织有显著的影响。铸轧前的半固态镁合金是由机械搅拌制备,组织中先结晶的固相颗粒形状不规则,有枝晶的痕迹;然而铸轧后组织中,先结晶的固相颗粒形状变得非常圆整,接近球形。基于试验结果,提出了半固态铸轧对一次相颗粒的圆整化机制。认为铸轧对半固态组织的圆整化作用是通过固液两相相对流动摩擦消除尖角而圆整化或固相颗粒翻滚破碎重叠合并而圆整化两种方式实现的。此外,在一定的工艺条件下,凝固的金属在进一步的轧制变形中,圆整的球形一次相颗粒被轧制变形,变成为椭球状。

【Abstract】 The paper investigated the microstructure of the semi-solid magnesium alloys by casting-rolling.The experiment of the casting and rolling of semi-solid Magnesium alloy was carried out on the equipment made by ourselves in our laboratory.It was found that casting and rolling have a remarkable effect on the microstructure of semi-solid Magnesium alloy.The slurry was gotten by the mechanical stirring before casting and rolling in which the first crystallized particle was not regular and remain the dendritic shape;but after casting and rolling the first crystallized particle in the microstructure becomed regular and near to ball.According to this fact,a new ball-regularization mechanism to semi-solid state by casting-rolling was put up.There was two ways to function:one is the friction between solid phase and liquid phase;the other is the rolling of the solid particle and crashing or combining which both leads to the solid particle changing into the ball.

【关键词】 铸轧半固态镁合金
【Key words】 casting-rollingsemi-solidMagnesium alloys
【基金】 科技部科研院所技术开发专项基金资助项目(NCSTE-2002-JKZX-071);江西省教育厅科技攻关资助项目(赣教技字[2005]18号)
  • 【文献出处】 塑性工程学报 ,Journal of Plasticity Engineering , 编辑部邮箱 ,2006年01期
  • 【分类号】TG335
  • 【被引频次】10
  • 【下载频次】206
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