半固态等温处理Mg-Zn-Y合金微观组织演变

发布时间：2018-03-21 10:27

  本文选题：Mg-Zn-Y　切入点：半固态　出处：《稀有金属材料与工程》2015年12期 　论文类型：期刊论文

【摘要】：研究了挤压Mg-2Zn-x Y(x=0.5,1,2,at%)合金在半固态等温处理过程中的微观组织演变规律。结果表明:3种Mg-2Zn-x Y合金中,挤压Mg-2Zn-1Y合金中α-Mg基体晶粒尺寸最小,挤压Mg-2Zn-2Y合金中出现了大量的孪晶;当半固态等温时间为10 min时,随着等温温度的升高,Mg-2Zn-x Y合金中α-Mg固相晶粒均逐渐趋于球化,且α-Mg固相颗粒逐渐分离,晶界处的液相和晶内液池体积分数均明显增加;随着580℃等温时间的延长(≤30 min),Mg-2Zn-0.5Y合金微观组织演变以Ostwald熟化机制为主,而Mg-2Zn-1Y和Mg-2Zn-2Y合金微观组织演变过程中Ostwald熟化机制和固相颗粒熔化机制同时起主导作用。
[Abstract]:The evolution of microstructure of extruded Mg-2Zn-x alloy during isothermal treatment was studied. The results showed that the grain size of 伪 -Mg matrix in extruded Mg-2Zn-1Y alloy was the smallest, and a large number of twins appeared in extruded Mg-2Zn-2Y alloy. When the isothermal time of semisolid is 10 min, the grains of 伪 -Mg solid phase in Mg-2Zn-x Y alloy tend to be spheroidized with the increase of the isothermal temperature, and the 伪 -Mg solid particles are separated gradually, and the volume fraction of liquid phase and liquid pool at grain boundary increase obviously. The microstructure evolution of Mg-2Zn-0.5Y alloy at 580 鈩，

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