Influences of Laser Powers on Microstructure and Properties of the Al-Si/Al+Al_2O_3 Coating on the AZ91D Magnesium Alloy

作     者：Qian Jiangang1,Zhang Jiaxiang1,2,Li Shuqing2,Wang Chun2,Gong Shuili21School of Chemistry and Environment,Beijing University of Aeronautics and Astronautics,Beijing 100191,China2Science and Technology on Power Beam Processes Laboratory,Avic Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China 

作者机构：Beijing Univ Aeronaut & Astronaut Sch Chem & Environm Beijing 100191 Peoples R China Avic Beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China 

出 版 物：《稀有金属材料与工程》 (Rare Metal Materials and Engineering)

年 卷 期：2011年第40卷第S4期

页      面：226-230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] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Foundation item:Project(20085451039)supported by the Aeronautical Foundation of China 

主　　题：laser-clad plasma-sprayed magnesium alloy Al-Si/Al+Al2O3 coating 

摘      要：An Al-Si/Al+Al2O3 coating was prepared on an AZ91D Mg alloy substrate by laser cladding of the plasma-sprayed coating.X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to identify the phases and to study the morphology,*** adhesion strength and the porosity ratio of the coating were measured by using a tensile testing machine and an optical microscope (OM),*** microhardness was measured using a micro Vickers hardness *** results show that after laser cladding,the adhesion strength of the coating increased from 10.78 to 25.17 *** the laser power was 1400W,the metastable γ-Al2O3 phase in the coating transformed completely into the stable α-Al2O3 *** with the increase of the laser power,the porosity ratio of the coating *** when the laser power was over 1400W,the porosity ratio *** microhardness of the surface was the hardest which was improved from HV0.05125 to *** larger the power of the laser was,the harder the coating *** when the power was 1600W,the microhardness increased slightly,even the microhardness of the internal decreased.