滑动摩擦加工Mg-Sn-Zn-Al合金的组织和性能  

Microstructure and Properties of Mg-Sn-Zn-Al Alloy Modified by Sliding Friction Treatment

作　　者：毕广利[1,2] 王亚硕 姜静[1,2] 李元东[1,2] 陈体军[1,2] 张于胜[3] 马颖[1,2] Bi Guangli;Wang Yashuo;Jiang Jing;Li Yuandong;Chen Tijun;Zhang Yusheng;Ma Ying(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology;Key Laboratory of Non-ferrous Metal Alloys and Processing,Ministry of Education,Lanzhou University of Technology;Advanced Materials Research Center,Northwest Institute for Non-Ferrous Metal Research)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室 [3]西北有色金属研究院新材料研究中心

出　　处：《特种铸造及有色合金》2021年第6期668-675,共8页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51961021,52001152);国家重点实验室开放基金资助项目(20192102);大学生创新创业计划资助项目(DC2020353,DC2020342)。

摘　　要：利用滑动摩擦加工(SFT)方法对挤压Mg-7Sn-5Zn-3Al合金进行表面改性,研究了SFT合金的显微组织、力学和腐蚀性能。结果发现,SFT后,合金表层的晶粒显著细化,第二相体积分数明显减少且分布弥散。拉伸测试结果表明,SFT合金显示了优异的力学性能,其屈服强度、极限抗拉强度和伸长率分别为181 MPa、366 MPa和18.1%。SFT方法对合金的耐蚀性改善明显,呈现了低的平均腐蚀速率(4.51 mm/a)和腐蚀电流密度(197.2μA/cm^(2)),这主要与晶粒细化、第二相体积分数的减少以及弥散分布有关。Microstructure,mechanical and corrosion properties of as-extruded Mg-7 Sn-5 Zn-3 Al alloy modified by sliding friction treatment(SFT)were investigated.After SFT,the grain in the surface layer of the alloy is significantly refined and the volume fraction of second phase is remarkly reduced with its dispersed distribution.Tensile testing results indicate that the SFT exhibits excellent mechanical properties,whose yield strength,ultimate tensile strength and elongation are 181 MPa,366 MPa and 18.1%,respectively.The corrosion resistance of SFT alloy is significantly improved,presenting a low average corrosion rate(4.51 mm/a)and corrosion current density(197.2μA/cm^(2)),which is mainly related to the grain refinement,small amount of the second phase and dispersed distribution.

关 键 词：挤压Mg-7Sn-5Zn-3Al合金 滑动摩擦加工 显微组织 力学性能 腐蚀行为 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]