摘要
研究了熔体超声处理对铸挤一体成形Mg-4Y-3Zn-2Al(wt.%)镁合金组织及性能的影响。通过XRD、DSC、SEM、EBSD、准静态拉伸试验等方法研究了超声处理前后铸态、变形态合金显微组织和力学性能的变化。结果表明,超声处理显著细化了初生Al2Y相的尺寸,消除了初生相的团聚。经过铸挤一体成形后,晶粒尺寸被细化至2μm,为完全再结晶的等轴晶组织。经过超声处理后,挤压态合金屈服强度和抗拉强度分别为246.8和307.5MPa,延伸率达到17%。相比于未超声-热挤压成形的合金,其延伸率大幅提高(提升了95%)的同时强度也有所增加,实现了良好的强-塑性匹配。
The effect of ultrasonic treatment on the microstructure and properties of Mg-4Y-3Zn-2Al(wt.%)magnesium alloy formed by continuous squeeze casting-extrusion is investigated.The changes in microstruc⁃ture and mechanical properties of the as-cast and extruded alloys before and after ultrasonic treatment are investigat⁃ed by XRD,DSC,SEM,EBSD,and quasi-static tensile tests.The results show that ultrasonic treatment signifi⁃cantly refines the size of the primary Al2Y phase and eliminates the agglomeration of the primary phase.After con⁃tinuous squeeze casting-extrusion,the grain size is refined to 2μm,resulting in a fully recrystallized equiaxed grain structure.After ultrasonic treatment,the yield strength and tensile strength of the extruded alloy is 246.8 and 307.5 MPa,respectively,with an elongation of 17%.Compared with the non-ultrasonic treatment alloy,its elonga⁃tion is greatly improved(by 95%)while the strength also increases,achieving a good strength-plasticity match.
作者
李世龙
李建宇
肖培杰
徐世伟
向渴望
吴树森
吕书林
Li Shilong;Li Jianyu;Xiao Peijie;Xu Shiwei;Xiang Kewang;Wu Shusen;LüShulin(Huazhong University of Science and Technology,State Key Lab of Materials Processing and Die&Mould Technology,Wuhan 430074;College of Mechanical and Vehicle Engineering,Hunan University,State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle,Changsha 410082;Suzhou Research Institute of Hunan University,Suzhou 215131)
出处
《汽车工程》
北大核心
2025年第9期1840-1846,共7页
Automotive Engineering
基金
国家自然科学基金(52175321)
整车先进设计制造技术全国重点实验室开放基金(82415001)资助。
关键词
镁合金
超声处理
铸挤一体化
显微组织
力学性能
Mg alloy
ultrasonic vibration
continuous squeeze casting-extrusion
microstructure
mechanical properties
作者简介
通信作者:吕书林,副教授,博士,E-mail:shulin317@hust.edu.cn。
