Effect of Cryogenic Treatment on Deformation Behavior of As-cast AZ91 Mg Alloy |
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| Authors: | LIU Junwei LI Guifa CHEN Ding CHEN Zhenhua |
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| Institution: | LIU Junweia, LI Guifaa, CHEN Dingb, CHEN Zhenhuab aCollege of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China bCollege of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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| Abstract: | The as-cast AZ91 Mg alloy samples were cryogenic treated with different time. Otherwise, optical microscope (OM), mechanical test, resistance test and XRD analysis were used to research the microstructure evolution and physical variation of the samples before and after cryogenic treatment (CT). Due to CT, the structure of as-cast AZ91 Mg alloy was changed from disordered solid solution to ordered solid solution. Firstly, the appearance of ordered solid solution leads to the improvement of peak stress after CT, because of ordered strengthening. Secondly, resistance and crystallographic lattice constant of the samples reduce obviously. Otherwise, the frame-type twinning which is created from matrix in the cryogenic environment could hinder the twin growth and cause the ordered strengthening. |
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| Keywords: | magnesium alloys cryogenic treatment ordered solution twinning microstructure |
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