6082和ZL101铝合金低熔共晶测试与分析  

Measurement and analysis of the eutectic aluminum alloys of 6082 and Zl101

作　　者：刘仁培[1] 董祖珏[2] 潘永明[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]哈尔滨焊接研究所,哈尔滨150080

出　　处：《焊接学报》2005年第10期27-30,共4页Transactions of The China Welding Institution

摘　　要：焊缝金属凝固过程中,低熔共晶的熔化温度及其在晶间的分布形态对焊接凝固裂纹敏感性有较大影响。通过采用水淬法得到了6082和ZL101两种铝合金低熔共晶的分布形态;采用差热分析法测试了焊缝金属中低熔共晶的熔化温度和吸热量。结果表明,铝合金材料不同低熔共晶的成分和分布形态有较大不同,6082材料有A l-Mg2S i和A l-Mg2S i-S i+A l-A lFeMnS i两种低熔共晶,其熔化温度分别为555℃和595℃。该材料低熔共晶在晶界以薄膜状分布;ZL101有A l-S i和A l-Mg2S i-FeMgS i6A l8-S i两种低熔共晶,这两种低熔共晶在晶界以连续网状形式分布,熔化温度分别为544℃和577℃。该结果有助于进一步研究焊接凝固裂纹的开裂行为。The melting point of the eutectic and morphological distribution between the grains had great effects on the susceptibility of weld solidification cracks during solidification. The morphological distributions of aluminum 6082 and ZL101 had been obtained by water quenching method and the melting temperature and heat absorption of the weld metal had been measured with DSC. The results show that the type of eutectic and their morphological distribution are different with different aluminum alloy. Al-Mg2Si and Al-Mg2Si-Si + Al-AlFeMnSi are two kinds of eutectics for 6082 alloy which are shaped of thin films between the grains and their melting temperatures are 555°C and 595°C respectively. For ZL101 alloy there are two kinds of eutectics, namely Al-Si and Al-Mg2Si-FeMgSi6Al8-Si which are distributed with continuous nets between the grains and their melting temperatures are 544°C and 577°C respectively. These results are in favor of studying the cracking behaviors of weld solidification cracks.

关 键 词：焊接凝固裂纹 铝合金 低熔共晶 

分 类 号：TG44[金属学及工艺—焊接]