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Influence of continuous bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 225-233页

作者： Ting-Zhuang Han Guang-Sheng Huang Lun Huang Bin Jiang Guan-Gang Wang Ai-Tao Tang Fu-Sheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology

Mg-3Al-lZn alloy sheets have been deformed by continuous bending（CB）to investigate the effects of pro-cessing parameters（bending angle and repetitive passes）on the texture and *** samples exhibited a bimodal microstructure with abnormal growth grains in the surface region and fine grains distributed in the center after CB process followed by *** texture evolution measured by XRD indicated that the basal poles were rotated from ND toward RD,and the texture intensity decreased with the bending angle decreasing and repetitive passes *** with the as-received sample,the yield strength of CBA-120-2 sample significantly decreased from 183 to 112 MPa,and a smaller r-value and a larger n-value were *** formability of CB processed samples in annealing condition was significantly enhanced with the highest of Erichsen value of 5.4 mm,increased by about 135%.The improvement of formability was likely attributed to the weakened and RD-tilt basal texture and coarse grains in the surface part.

关键词： Magnesium alloy continuous bending Microstructure Texture Stretch formability

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Enhanced mechanical properties of AZ31 magnesium alloy sheets by continuous bending process after V-bending

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Progress in Natural Science:Materials International 2016年第1期26卷 97-102页

作者： Tingzhuang Han Guangsheng Huang Yougen Wang Guangang Wang Yanchun Zhao Fusheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology

The effects of V-bending process, continuous bending process and combination process on the microstructure and mechanical properties and formability of an AZ31 magnesium alloy sheet were investigated. The experimental results showed that no twins were found in the microstructure of all samples after processes due to the fine grain. The V-bending and continuous bending processes were proved to be an effective approach to modify the mechanical properties and formability. While the samples after the combination process exhibited better mechanical properties and formability than the single processed sample. The yield strength significantly decreased with the value of 100 MPa and the fracture elongation enhanced to 18.3% at room temperature. The Erichsen value was 5.0 mm which was significantly increased by 117% compared with as-received sample. The superior formability of combination processed samples was mainly attributed to the smaller r-value and n-value.

关键词： AZ31 magnesium alloy continuous bending V-bending Mechanical properties Formability

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Microstructure and formability evolutions of AZ31 magnesium alloy sheets undergoing continuous bending process

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2043-2050页

作者： Ting-zhuang HAN Guang-sheng HUANG You-gen WANG Guan-gang WANG Yan-chun ZHAO Fu-sheng PAN State Key Laboratory of Mechanical Transmission School of Materials Science and EngineeringChongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Research Center for Advanced Materials Chongqing Academy of Science & TechnologyChongqing 401123 China

continuous bending (CB) process along rolling direction was performed to improve the formability of AZ31 magnesium alloy sheets. The microstructure and texture evolutions were characterized by optical microscopy (OM) and electronic backscatter diffraction (EBSD). The results reveal that the basal texture intensity of continuously bent and annealed (CBA) sample is drastically weakened. A large number of twins are induced on the concave surface by the 1st pass bending and the density of twins obviously declines during the 2nd pass bending owing to the occurrence of detwinning. Due to the asymmetric tension?compression strain states between the outer and inner regions during V-bending, twinning and detwinning are generated alternatively during the CB process. The Erichsen value is 5.2 mm which increases by 41% compared with that of as-received sample. This obvious improvement of formability can be attributed to the weakened basal texture, which leads to a smaller plastic strain ratio (r-value)together with a larger strain-hardening exponent (n-value).

关键词： AZ31 magnesium alloy continuous bending twinning detwinning microstructure formability

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