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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(英文),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.]
Effects of precipitated phase on microstructure and edge crack behavior of AZ91 hot rolled magnesium alloy plate
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Received:November 09, 2015  Revised:February 02, 2016
DOI:
Key words: precipitated phase  AZ91 magnesium alloy  hot rolling deformation  microcrack
Foundation item:国家自然科学基金资助(项目号51474152和51175363)
Author NameAffiliationE-mail
Zheng Liuwei College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan 45964951@qq.com 
Nie Huihui College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan  
Liang Wei College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan  
Wang Yide College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan  
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Abstract:
      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.