本文選題：Mg-Zn-Y　切入點：半固態(tài)　出處：《稀有金屬材料與工程》2015年12期 　論文類型：期刊論文

【摘要】：研究了擠壓Mg-2Zn-x Y(x=0.5,1,2,at%)合金在半固態(tài)等溫處理過程中的微觀組織演變規(guī)律。結(jié)果表明:3種Mg-2Zn-x Y合金中,擠壓Mg-2Zn-1Y合金中α-Mg基體晶粒尺寸最小,擠壓Mg-2Zn-2Y合金中出現(xiàn)了大量的孿晶;當(dāng)半固態(tài)等溫時間為10 min時,隨著等溫溫度的升高,Mg-2Zn-x Y合金中α-Mg固相晶粒均逐漸趨于球化,且α-Mg固相顆粒逐漸分離,晶界處的液相和晶內(nèi)液池體積分數(shù)均明顯增加;隨著580℃等溫時間的延長(≤30 min),Mg-2Zn-0.5Y合金微觀組織演變以O(shè)stwald熟化機制為主,而Mg-2Zn-1Y和Mg-2Zn-2Y合金微觀組織演變過程中Ostwald熟化機制和固相顆粒熔化機制同時起主導(dǎo)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 偽 -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 偽 -Mg solid phase in Mg-2Zn-x Y alloy tend to be spheroidized with the increase of the isothermal temperature, and the 偽 -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，

本文編號：1643449