Effect of pre-homogenizing treatment on microstructure and mechanical properties of hot-rolled AZ91 magnesium alloys  

作　　者：Liuwei Zheng Huihui Nie Wei Liang Hongxia Wang Yide Wang 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China [2]Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Taiyuan 030024,Shanxi,China [3]Taiyuan Iron and Steel(Group)Co.,LTD,Taiyuan 030003,Shanxi,China

出　　处：《Journal of Magnesium and Alloys》2016年第2期115-122,共8页镁合金学报（英文）

基　　金：the National Natural Science Foundation of China(Grant Nos.51175363 and 51474152);the Research Project Supported by the Shanxi Scholarship Council of China(Grant Nos.2014029)。

摘　　要：To improve the homogeneity and rolling formability of as-cast AZ91 magnesium,the effects of pre-homogenizing treatment on microstructure evolution,deformation mechanism,mechanical properties and tensile fracture morphology of hot-rolled AZ91 magnesium alloy were studied.The results showed that the amount of coarseβ-Mg17Al12 phase decreases dramatically,being distributed along the grain boundaries as small strips after homogenizing.Twining plays a dominant role in the deformation mechanism of AZ91 alloys in the experimental condition,while dynamic recrystallization(DRX)considerably occurred in homogenized-rolled alloys,contributed to microstructure uniformity andβ-Mg17Al12 phase precipitated refinement.The tensile strength of homogenized-rolled AZ91 alloys increases dramatically with elongation declining slightly in contrast to homogenized alloys.The fracture surface of homogenized-rolled specimen exhibits more ductile fracture with the manifestation of a large amount of dimples distributing higher density in matrix,while the micro cracks are prone to initiate around the Mg/Mg17Al12 phase interface and grain boundaries owing to the fragile interface bonding of two phases.

关 键 词：HOMOGENIZATION AZ91 magnesium alloys Twining Hot rolling β-Mg17Al12 phase 

分 类 号：TG1[金属学及工艺—金属学]