Sr对大挤压比制备Mg-14Li-1Al合金微观组织及力学性能的影响  

Effect of Sr addition on microstructure and mechanical properties of Mg-14Li-1Al alloy processed by large-strain hot extrusion

作　　者：李瑞红[1,2] 逄雪 冯效琰 何旭 宋延程 李桐 金自力 任慧平[1,2] LI Ruihong;PANG Xue;FENG Xiaoyan;HE Xu;SONG Yancheng;LI Tong;JIN Zili;RNE Huiping(Materials and Metallurgy School(Rare Earth School),Inner Mongolia University of Science and Technology,Baotou 014010,China;Collaborative Innovation Center of Intergrated Exploitation of Bayan Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院(稀土学院),内蒙古包头014010 [2]内蒙古科技大学白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2022年第2期156-159,共4页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区自然科学基金资助项目(2019MS05037);内蒙古自治区关键技术攻关计划基金资助项目(2021GG0094)。

摘　　要：对Mg-14Li-1Al及Mg-14Li-1Al-0.3Sr合金进行了挤压比分别为4和25的2次正向挤压试验,研究了Sr对大挤压比制备Mg-14Li-1Al合金微观组织及力学性能的影响.研究结果表明:添加质量分数为0.3%Sr到Mg-14Li-1Al合金可以明显细化合金的铸态组织,经2次挤压后合金的晶粒为均匀细小的再结晶晶粒,平均晶粒尺寸大约为25μm,铸态合金中存在的网状第二相Al_(4)Sr在经2次挤压后变成更加细小的颗粒,均匀的分布在基体中.经2次挤压后Mg-14Li-1Al-0.3Sr的力学性能较Mg-14Li-1Al均有提高,其中抗拉强度为220 MPa,屈服强度为197 MPa,延伸率为20%,其断口呈现韧性断裂的特征.Two forwad extrusion of Mg-14Li-1 Al and Mg-14Li-1Al-0.3Sr alloy with extrusion ratio of 4 and 25 were carried out,respectively.The effects of Sr addition on microstructure and mechanical properties of the extruded LA141 alloy were studied.The results show that the addition of 0.3% Sr can significantly refine the microstructure of cast LA141 alloy.After two pass extrusion,the smaller recrystallization grains with average size of 25μm were found in LA141-0.3Sr,and the reticular Al_(4)Sr phases became finer particles,which were distributed in the matrix uniformly.The maximum tensile strength,yield strength and elongation of LA141-0.4Sr alloy are 220 MPa,197 MPa and 20%,respectively.The fracture of the alloy is obviously ductile.

关 键 词：镁锂合金 大挤压比 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]