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Zheng L.,Taiyuan University of Technology | Zheng L.,Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province | Zheng L.,Shanxi Engineering Vocational College | Zhao Z.,Taiyuan University of Technology | And 5 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

The effect of different rolling temperature on formability, microstructure and mechanical properties of AZ91 magnesium alloys was investigated, the second phase distribution and edge cracking behavior were also studied. The results exhibit that the effect of different temperature on rolling formability is remarkable. After rolling at 350℃ and 450℃, transverse cracks appear in the edge and surface of the sample. While rolling at 400℃, more homogenized and refined microstructure can be obtained, and rolling formability is improved. Room temperature tensile properties of the sample increase firstly and then decrease, and reach the maximumvalue at 400℃, while the tensile strength and elongation reach 289 MPa and 10.4%, respectively. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Zheng L.,Taiyuan University of Technology | Zheng L.,Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province | Zheng L.,Shanxi Engineering Vocational College | Liang W.,Taiyuan University of Technology | And 9 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2016

To improve the inhomogeneity and rolling forming ability of as-cast AZ91 magnesium alloy, the effect of homogenizing annealing treatment on microstructure and mechanical properties of AZ91 magnesium alloy before and after rolling deformation was studied. The results show that the distribution of second phase in the alloy tissue is improved effectively after homogenization annealing treatment. After multi-pass rolling at 400℃, the thin strip Mg17Al12 phase which originally distributes along the grain boundaries reduces significantly with some of them fragmenting, and some distribute near the grain boundaries or inside the grains as small particles. Compared with the strength of as-cast rolled alloy, the strength of rolled alloy after homogenization increases slightly; while the elongation increases by 50%. The tensile fracture morphology after rolling indicates that the ductility of alloy improves markedly. © 2016, Science Press. All right reserved.

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