Achieving bimodal microstructure and enhanced tensile properties of Mg–9Al–1Zn alloy by tailoring deformation temperature during hard plate rolling (HPR)

In the present work, we investigated the influence of deformation temperature on the formation of a bimodal microstructure and tensile properties of a Mg–9Al–1Zn (AZ91) alloy processed by a single pass hard plate rolling (HPR) with a thickness reduction of 55% followed by a short time annealing. Mic...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-10, Vol.765, p.1228-1236
Main Authors: Zha, Min, Zhang, Xuan–He, Zhang, Hang, Yao, Jia, Wang, Cheng, Wang, Hui–Yuan, Feng, Ting–Ting, Jiang, Qi–Chuan
Format: Article
Language:English
Subjects:
Bimodal microstructure
Hard plate rolling
Magnesium alloys
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Summary:In the present work, we investigated the influence of deformation temperature on the formation of a bimodal microstructure and tensile properties of a Mg–9Al–1Zn (AZ91) alloy processed by a single pass hard plate rolling (HPR) with a thickness reduction of 55% followed by a short time annealing. Microstructural examinations by electron backscatter diffraction (EBSD) reveal that there exists a narrow deformation temperature window, i.e. it is only feasible to achieve a desired bimodal grain structure in the AZ91 alloy when HPRed at ∼350 °C. It is mainly because that partial dynamic recrystallization (DRX) occurs easily in the sample HPRed at ∼ 350 °C, facilitating the formation of a bimodal microstructure consisting of coarse un–recrystallized grains (>∼70 μm) and fine recrystallized grains (
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.04.328