自孕育工藝參數對ZA96鎂合金半固態組織的影響及其交互本質Effects of self-inoculation technological parameters on semi-solid microstructure of ZA96 magnesium alloy and interactive nature

采用自孕育法制備ZA96鎂合金半固態組織，研究自孕育工藝參數對ZA96鎂合金半固態組織的影響，并從溫度場的角度分析工藝參數之間相互作用的本質。結果表明：采用自孕育法鑄造，能夠獲得合格的半固態坯料和漿料。工藝參數對半固態坯料組織影響較大，但對從導流器出口處收集到的漿料在半固態區間進行保溫后，發現自孕育劑加入量對組織影響不大，而導流器角度的影響較大。熔體過熱度為80~95 ℃、自孕育劑加入量為5%、導流器角度為45°時，半固態坯料組織的晶粒平均尺寸較小，約為35.6 μm；或經552 ℃、20 s保溫后，其晶粒尺寸為45 μm，圓整度為1.7。自孕育工藝參數交互作用的本質在于通過自孕育參數的調整從而達到控制其形核的目的。推導出了熔體在導流器出口處的溫度與自孕育工藝參數之間的關系式。

Semi-solid microstructure of ZA96 magnesium alloy was prepared by self-inoculation method (SIM). The effects of self-inoculation technological parameters on the microstructure of semi-solid ZA96 magnesium alloy were investigated. And the nature of interactive effect between technological parameters was analyzed from the standpoint of temperature field. The results show that high-quality semi-solid billets and slurry can be obtained by SIM. The effects of self-inoculation technological parameters on the microstructure of semi-solid billets are bigger, but for the microstructure of semi-solid slurry which is collected from the exit of the fluid director and holding in semi-solid interval, the effect of self-inoculants is smaller, but that of the angle of fluid director is bigger. When the superheat of the melt is 80-95 ℃ and the addition of self-inoculants is 5% and the angle of fluid director is 45°, the grain size of semi-solid billet is 35.6 μm; or after holding 20 s at 552 ℃, the grain size of primary phase is 45μm and the roundness is 1.7. The interactive nature of self-inoculation technology parameters is to control nucleation by coordinating them. The formula between the temperature of melt in the exit of fluid director and self-inoculation technological parameters was derived.

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