Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy

查看全文 作　　者：Yali [1]GAO;Dangsheng [1]XIONG;Cunshan [2]WANG;Yongzhe [2]CHEN

机构地区：[1]School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;[2]State Key Laboratory for Materials Modification, Dalian University of Technology, Dalian 116024, China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2009年第22卷第3期,共7页

基　　金：supported by the Chinese Post-Doctoral Fund (No.20070421011);the Jiangsu Province Post-Doctoral Fund (No.0702029B) 摘　　要：Al-Si alloy coatings were prepared on AZ91HP magnesium alloy by broad-beam laser cladding; the influences of the powers on the microstructure and properties of the coatings were discussed. It was found that the microstructure of the coatings at the powers of 3 and 3.5 kW was characterized by Mg2Si dendrites, and needle-like Mg2Al3 (hcp) dispersing in the Mg17Al12 matrix, whereas the coating at the power of 2.5 kW was composed of the petal-like Mg2Al3 (fcc) as well as the needle-like Mg2Al3 (hcp). The coating at the power of 4 kW appeared as α-Mg solid solution and Mg2Si, Mg17Al12, as well as Mg2Al3 (hcp). The coatings with the powers of 3 and 3.5 kW exhibited higher microhardness and better wear resistance because of more Mg2Si and Mg17Al12. However, the coating at the power of 2.5 kW displayed better corrosion resistance. 关键词：涂层制备组织和性能激光功率镁合金 MG2SI 羟基喜树碱宽带激光熔覆微观结构

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Influences of laser powers on microstructure and properties of the coatings on the AZ91HP magnesium alloy

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