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材料工程  2013, Vol. 0 Issue (6): 29-34    DOI: 10.3969/j.issn.1001-4381.2013.06.006
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
压铸AZ91D镁合金激光重熔区氢气孔的形成机制
查吉利1, 龙思远1,2, 吴星宇1, 张均成1, 王向杰1
1. 重庆大学 材料科学与工程学院,重庆 400044;
2. 重庆大学 国家镁合金材料工程技术研究中心,重庆 400044
Formation Mechanism of Hydrogen Pore in Die Cast AZ91D Magnesium Alloy Laser Re-melting Zone
ZHA Ji-li1, LONG Si-yuan1,2, WU Xing-yu1, ZHANG Jun-cheng1, WANG Xiang-jie1
1. College of Materials Science and Engineering,Chongqing University, Chongqing 400044,China;
2. National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China
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摘要 为研究压铸镁合金熔化焊接气孔的形成机理,对厚度为6mm的AZ91D压铸镁合金和厚度为2.2mm的AZ71热挤压镁合金进行CO2激光局部重熔。采用扫描电子显微镜(SEM)观察气孔形貌,利用粒径分析软件Nano measure 1.2测量气孔的尺寸。结果表明:压铸镁合金重熔区气孔问题突出,少数粗大的宏观气孔形状不规则,内壁粗糙,具有明显的金属冲刷痕迹,均来源于母材预存微观气缩孔;多数微观气孔内壁光滑、呈倒喇叭形,属于氢致气孔。分析了氢致气孔的形成机制,建立了氢气孔形成过程的模型,并同实验照片进行了比较,发现所建立的模型能够很好地用来解释氢致气孔的形成过程。
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关键词 AZ91D压铸态镁合金激光重熔氢致气孔    
Abstract:In order to investigate the mechanism of pore formation in fusion welding zone of die cast Mg alloys, local re-melting of die cast magnesium alloy AZ91D of 6mm thickness and hot extruded AZ71 Mg alloy of 2.2mm utilizing CO2 laser have been conducted. Base metal microstructure and pore morphology have been observed by adopting SEM. The size of pores has been measured by particle size analysis software Nano measure 1.2. The results indicate that large pores have irregular shape and hackly inner wall of obvious traces scoured by metal, and these pores are developed by shrinkage blowhole of base metal; Small pores, resulted from hydrogen, have smooth inner wall and upside down broadening formation. The formation mechanism of hydrogen induced pores was analyzed, a model of hydrogen induced pores’ formation was established. Furthermore, the model was compared with the experimental photographs, which could be used to explain the formation of hydrogen induced pore.
Key wordsAZ91D    die cast magnesium alloy    laser re-melting    hydrogen induced pore
收稿日期: 2012-03-23      出版日期: 2013-06-20
中图分类号: 

TG146.7

 
基金资助:

国家自然科学青年基金(51105393) ;重庆大学中央高校基本科研业务费(CDJXS11132226);重庆市科技攻关项目(CSTC2010AA4045);重庆大学大型仪器设备开放基金 (2011121563)

通讯作者: 龙思远 (1560-),男,教授,主要从事轻金属成型及设备开发等方面的研究工作,联系地址:重庆市沙坪坝区沙正街174号重庆大学材料科学与工程学院(400044)     E-mail: siyuan_long@yahoo.com
作者简介: 查吉利(1980-),男,博士生,主要从事镁合金成型技术的研究工作,联系地址:重庆市沙坪坝区沙正街174号重庆大学材料科学与工程学院(400044), E-mail: 415160823@qq.com
引用本文:   
查吉利, 龙思远, 吴星宇, 张均成, 王向杰. 压铸AZ91D镁合金激光重熔区氢气孔的形成机制[J]. 材料工程, 2013, 0(6): 29-34.
ZHA Ji-li, LONG Si-yuan, WU Xing-yu, ZHANG Jun-cheng, WANG Xiang-jie. Formation Mechanism of Hydrogen Pore in Die Cast AZ91D Magnesium Alloy Laser Re-melting Zone. Journal of Materials Engineering, 2013, 0(6): 29-34.
链接本文:  
http://jme.biam.ac.cn/CN/10.3969/j.issn.1001-4381.2013.06.006      或      http://jme.biam.ac.cn/CN/Y2013/V0/I6/29
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