【摘要】 研究了Ca、Pr复合微合金化与挤压工艺对AS41镁合金半固态微观组织的影响。结果表明，Ca、Pr复合微合金化能够明显降低Mg₁₇Al₁₂相的含量，形成Al₂Ca和Al-Pr相。在半固态等温处理过程中，Ca、Pr元素具有吸附毒化作用且Al₂Ca和Al-Pr相具有钉扎界面的作用，促使α-Mg和晶界熔化率降低。挤压工艺促进再结晶重熔的发生，提高了晶粒密度。在Ca、Pr复合微合金化与挤压共同作用下，半固态AS41镁合金具有更高的晶粒密度和较低的晶粒粗化系数。更多还原

【Abstract】 The effects of Ca&Pr elements and extrusion process on the semisolid microstructure of AS41 magnesium alloy were investigated. The results indicate that Ca, Pr addition can reduce the content of Mg₁₇Al₁₂ significantly and generate Al₂Ca and Al-Pr phases simultaneously. In the process of semi-solid isothermal treatment, the melting rate of α-Mg and grain boundary is decreased with adsorption poisoning of Ca, Pr elements and pinning effect of Al₂Ca, Al-Prphases on the interface. Meanwhile, the extrusion process promotes the occurrence of recrystallization and partial melting, increasing the grain density, semi-solid AS41 magnesium alloy exhibits higher grain density and lower grain coarsening coefficient due to the combined effect of Ca, Pr microalloying and extrusion process.更多还原