半固態(tài)等溫處理與電磁感應(yīng)加熱AZ80-0.2Y鎂合金組織的演變

半固態(tài)等溫處理與電磁感應(yīng)加熱AZ80-0.2Y鎂合金組織的演變Microstructure evolution of AZ80-0.2Y magnesium alloy processed by semi-solid isothermal and induction heat-treatment

分別使用等溫處理與電磁感應(yīng)加熱制備AZ80-0.2Y鎂合金半固態(tài)坯料，對比等溫處理與不同感應(yīng)加熱功率條件下半固態(tài)組織形貌特征。結(jié)果表明：等溫處理半固態(tài)組織液相以晶界網(wǎng)狀液池為主、固相球內(nèi)的球形液池為輔；感應(yīng)加熱形成的液相主要由晶內(nèi)長條狀液池為主、晶界網(wǎng)狀液池為輔。感應(yīng)加熱制備的半固態(tài)坯料比等溫處理的半固態(tài)組織晶粒更細(xì)小，液相率更高；大功率感應(yīng)加熱相對于小功率感應(yīng)加熱，晶粒尺寸小，液相率更高；從室溫使用功率4 kW感應(yīng)加熱至590 ℃用時90 s，平均晶粒尺寸65.1 μm，液相率45%，晶粒形狀系數(shù)2.15，已具備較優(yōu)的成形性能。

Semi-solid billets of AZ80-0.2Y magnesium alloy were fabricated by isothermal and induction heat-treatment. The differences of microstructure morphologies were compared between isothermal and induction heat-treatment with different heating powers. The results show that the liquid phase mainly exists at grain boundary with isothermal heat-treatment. However, the liquid phase mostly presents intragranular strip shape with induction heat-treatment. The grain size of the billets processed by induction heat-treatment is smaller and the liquid fraction is bigger than that of isothermal heat-treatment. Besides, the semi-solid billets processed by induction heating treatment with bigger power (4 kW) have smaller grain size and more liquid phase. Good formability can be achieved by induction heating with power 4 kW. The average grain size is 65.1 μm, while the liquid fraction is 45%, and grain shape factor is 2.15.

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