Hot Cracking in AZ31 and AZ61 Magnesium Alloy

查看全文 作　　者：C.J. [1]Huang;C.M. [2]Cheng;C.P. [1]Chou;F.H. [2]Chen

机构地区：[1]Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, China;[2]Department of Industrial Education, National Taiwan Normal University, Taipei 106, Taiwan, China

出　　处：《Journal of Materials Science & Technology》索引2011年第27卷第7期,共8页

摘　　要：This paper examined the impact of the number of thermal cycles and augmented strain on hot cracking in AZ31 and AZ61 magnesium alloy. Statistical analyses were performed. Following observation using a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS) was used for component analysis. Results showed that Al content in magnesium alloy has an effect on hot cracking susceptibility. In addition, the nonequilibrium solidification process produced segregation in Al content, causing higher liquid Mg-alloy rich Al content at grain boundaries, and resulting into liquefied grain boundaries of partially melted zone (PMZ). In summary, under multiple thermal cycles AZ61 produced serious liquation cracking. AZ61 has higher (6 wt%) Al content and produced much liquefied Mg17Al12 at grain boundaries under multiple thermal cycles. The liquefied Mg17Al12 were pulled apart and hot cracks formed at weld metal HAZ due to the augmented strain. Since AZ31 had half the Al content of AZ61, its hot-cracking susceptibility was lower than AZ61. In addition, AZ61 showed longer total crack length (TCL) in one thermal cycle compared to that in three thermal cycles. This phenomenon was possibly due to high-temperature gasification of Al during the welding process, which resulted in lower overall Al content. Consequently, shorter hot cracks exhibited in three thermal cycles. It was found the Al content of AZ31 and AZ61 can be used to assess the hot-cracking susceptibility. 关键词：AZ61镁合金热裂纹敏感性 AZ31 扫描电子显微镜 AL含量能量色散谱仪热循环统计分析

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Hot Cracking in AZ31 and AZ61 Magnesium Alloy

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