Ca与Pr微合金化及热挤压对AS41镁合金半固态微观组织的影响  

Effects of Ca&Pr Microalloying and Hot Extrusion Process on the Semisolid Microstructure of AS41 Magnesium Alloy

作　　者：吁安山 谢世坤 易荣喜 尹健 郑小秋 杨湘杰[3] Yu Anshan;Xie Shikun;Yi Rongxi;Yin Jian;Zheng Xiaoqiu;Yang Xiangjie(School of Mechanical and Electrical Engineering,Jinggangshan University;Key Laboratory of Light Alloy Materials in Ji'an City;School of Mechanical and Electrical Engineering,Nanchang University)

机构地区：[1]井冈山大学机电工程学院 [2]吉安市轻合金材料重点实验室 [3]南昌大学机电工程学院

出　　处：《特种铸造及有色合金》2023年第5期624-629,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51661023);江西省自然科学基金资助项目(20181BAB206028);江西省教育厅科学技术研究重点项目(GJJ2201606,GJJ201032);吉安市重大科技专项资助项目(吉财教指[2020]83号,[2022]4号);井冈山大学博士科研启动项目(JZB2018)。

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Mg_(17)Al_(12)相的含量,形成Al_(2)Ca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Al_(2)Ca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。The effects of CaPr 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 Mg_(17)Al_(12)significantly and generate Al_(2)Ca and Al-Pr phases simultaneously.In the process of semi-solid isothermal treatment,the melting rate ofα-Mg and grain boundary is decreased with adsorption poisoning of Ca,Pr elements and pinning effect of Al_(2)Ca,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.

关 键 词：AS41镁合金 CA PR MG2SI相 半固态 

分 类 号：TG249.9[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]