Laser surface melting AZ31B magnesium alloy with liquid nitrogen-assisted cooling

作     者：崔泽琴 施海霞 王文先 许并社 Ze-qin CUI;Hai-xia SHI;Wen-xian WANG;Bing-she XU

作者机构：太原理工大学材料科学与工程学院太原030024 太原理工大学新材料界面科学与工程教育部重点实验室太原030024 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2015年第25卷第5期

页      面：1446-1453页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0813[工学-建筑学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project(51305292)supported by the National Natural Science Foundation of China Project(2014-024)supported by Shanxi Scholarship Council of China 

主　　题：magnesium alloy laser surface melting liquid nitrogen-assisted cooling microhardness corrosion resistance 

摘      要：Laser surface melting（LSM） is a high-energy surface treatment that allows modification of the microstructure and surface properties of Mg alloys. In the present work, an attempt of LSM on magnesium alloy with liquid nitrogen-assisted cooling（LNSC） was carried out to get the higher cooling rate and improve the surface properties. The experimental results were compared with those of Ar gas protection at room temperature. The samples after LSM with LNSC resulted in a thinner melted layer, a highly homogeneous, refined melted microstructure and formed a lot of worm-like nanocrystals and local amorphous structures. Microhardness of the melted layer with LNAC was improved to HV 90-148 as compared to HV 65-105 of the samples with Ar gas protection. The corrosion resistance of the melted layer in a 3.5% Na Cl solution（mass fraction） was improved because of the grain refinement and redistribution of β-Mg17Al12 phases following rapid quenching associated with the process.