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OALib Journal期刊
ISSN: 2333-9721
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压铸AZ91D镁合金母材气孔在重熔过程的遗传性研究
DOI: 10.3724/SP.J.1037.2012.00239, PP. 1437-1445
Keywords: 压铸镁合金,激光重熔,气孔,形成机制
Abstract:
对压铸AZ91D镁合金进行CO2激光局部重熔,采用OM和SEM观察了母材预存气孔和重熔区气孔特征,利用粒径分析软件Nanomeasure1.2测量了气孔尺寸,着重研究了重熔区气孔同母材气孔的关联性.结果表明压铸镁合金母材预存气孔在重熔过程表现出明显的遗传性;重熔区出现的微观气孔具有近圆形截面,内壁光滑,是氢致气孔;重熔区出现的宏观气孔呈蠕虫状,内壁存在气体通道,并具有明显的金属冲刷痕迹.分析认为,氢致气孔主要遗传于母材固溶的原子氢和存于压铸缺陷的分子氢,宏观气孔主要遗传于母材压铸过程卷入的气体.分析了两类气孔的形成机制,建立了母材预存气孔同重熔区宏观气孔内在关联的数学模型.
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