郑留伟,聂慧慧,梁伟,王一德.析出相对AZ91镁合金热轧板组织及边裂行为的影响[J].稀有金属材料与工程,2018,47(1):229~234.[Zheng Liuwei,Nie Huihui,Liang Wei,Wang Yide.Effects of precipitated phase on microstructure and edge crack behavior of AZ91 hot rolled magnesium alloy plate[J].Rare Metal Materials and Engineering,2018,47(1):229~234.]
析出相对AZ91镁合金热轧板组织及边裂行为的影响
投稿时间:2015-11-09  修订日期:2016-02-02
中文关键词:  析出相  AZ91镁合金  热轧成形  微裂纹
基金项目:国家自然科学基金资助(项目号51474152和51175363)
中文摘要:
      采用光学显微镜(OM)、配有能谱(EDS)的场发射扫描电子显微镜(SEM)、室温拉伸试验等研究了析出相对AZ91镁合金在不同变形量和道次轧制后的微观组织、变形机制及边裂行为的影响。实验结果表明:对铸态AZ91镁合金而言,小压下量、多道次轧制可减少边部裂纹的产生,提高轧制成形能力;在轧制变形过程中,析出相由片层状向球状颗粒转变,且粒度更小,球状颗粒状第二相在轧制变形过程中可以通过促进孪晶细化和动态再结晶,从而有利于抑制裂纹的萌生;热轧后室温拉伸断口呈现较强的沿晶断裂特征,微裂纹主要分布在Mg/Mg17Al12相界面结合处及较粗大的第二相附近。在拉伸变形过程中,球状析出相颗粒成为微裂纹萌生的源头,微裂纹进一步扩展并形成宏观裂纹。
Effects of precipitated phase on microstructure and edge crack behavior of AZ91 hot rolled magnesium alloy plate
英文关键词:precipitated phase  AZ91 magnesium alloy  hot rolling deformation  microcrack
英文摘要:
      The effects of precipitated phase on the microstructure, deformation mechanism and edge crack behavior of AZ91 hot rolled magnesium alloy plate with different reduction per pass and rolling passes were studied by optical microscope, field emission scanning electron microscope equipped with energy spectrum and tensile testing at ambient temperature. The results indicate that multi-pass with small rolling reduction can reduce the edge cracks and improve the rolling forming ability for AZ91 magnesium alloy; Precipitated phase from the slice layer to spherical particles with tinier size during the rolling deformation is beneficial to inhibit the initiation of crack; The tensile fracture surfaces show obvious intergranular fracture features, and the microcrack primarily distributes around the Mg/Mg17Al12 phase interface and coarser second phase. Spherical precipitated phase particles have been proved to be the initiation source of microcrack, and then the microcrack extends and turns to the microcrack.
作者单位E-mail
郑留伟 太原理工大学材料科学与工程学院 45964951@qq.com 
聂慧慧 太原理工大学材料科学与工程学院  
梁伟 太原理工大学材料科学与工程学院  
王一德 太原理工大学材料科学与工程学院  
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