Laser surface melting in liquid nitrogen of AZ31B magnesium alloy for microhardness and corrosion resistance improvement

摘要：

　　Magnesium or its alloys have shown great potential as promising biocorrosive or biodegradable implantation materials and/or internal fixators, owing to their good biocompatibility and osteoinductive potential.However, poor anticorrosion property or rapid biodegradation in human body are serious impediments against wider application of Mg alloys.In the present work, a pulsed Nd : YAG laser was used to melt and rapidly solidify the surface of the magnesium alloy in liquid nitrogen with the objective of changing microstructure and improving the surface properties.The experimental results were compared with those of Ar gas protection at room temperature.The results indicate that laser-melted layer in liquid nitrogen is finer than in Ar gas protection and contains a lot of worm-like nanocrystals and local amorphous structures.Compared with the latter, the laser surface melting treatment in liquid nitrogen increased the microhardness of the AZ31B Mg-alloy and improved its corrosion resistance.

关键词： magnesium alloy laser surface melting liquid nitrogen microhardness corrosion resistance

作者: CUI Zeqin SHI Haixia WANG Wangxian XU Bingshe

作者单位: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Chin College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Chin

会议类型: 国际会议

会议名称: The 2nd International Conference on Energy and the Future of Heat Treatment and Surface Engineering(第2届未来热处理及表面工程与能源国际会议暨2014年北京香山材料热处理与表面工程国际论坛)

会议地点: 北京

会议语种:英文

页码: 276-284

在线出版日期: 2014-10-11（万方平台首次上网日期，不代表论文的发表时间）