高功率激光熔凝AZ91HP镁合金组织和性能  

Microstructure and Properties of AZ91HP Magnesium Alloy Treated by High Power Laser Melting

作　　者：高亚丽[1] 王存山[1] 刘红宾[1] 姚曼[2] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室,辽宁大连116023 [2]大连理工大学材料学院,辽宁大连116023

出　　处：《中国激光》2007年第7期1019-1024,共6页Chinese Journal of Lasers

摘　　要：在真空条件下对AZ91HP镁合金进行了高功率激光熔凝处理。研究结果表明,在高功率激光快速扫描下,熔凝层主要由分布于α-Mg枝晶间的板条状β-Mg17Al12构成,硬质相β-Mg17Al12含量较原始镁合金有所增加。随激光功率增加,熔凝层树枝晶尺寸逐渐增大,且长度方向上的增加幅度约为宽度方向上增加幅度的10倍。由于枝晶细化和β-Mg17Al12的强化作用,与原始镁合金相比,熔凝层的硬度约提高90%左右,耐磨性提高78%,耐蚀性显著提高。AZ91HP magnesium alloy was treated by laser melting in vacuum. The results showed that with high power laser and rapidly scanning speed, the melted layers mainly consisted of α-Mg dendrite and lath-shaped β-Mg17 Al12 distributing in the inter-dendrite, and the melted layer contained more β-Mg17 Al12 than that of as-received Mg alloy. With the increase of laser powers, the grain dimension of the melted layer increased, and the increased amplitude along the long direction was 10 times of that along the width direction. Because of the grain refinement and the enhancement of the hard phase β-Mg17 All2, the microhardness of the melted layer was increased by 90%, the wear resistance was increased by 78%, and the corrosion resistance was significantly improved compared with as-received Mg alloy.

关 键 词：激光技术 镁合金 激光熔凝 组织 性能 

分 类 号：TG156.99[金属学及工艺—热处理]