Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 26    No. 8    August 2016

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Microstructure and formability evolutions of AZ31 magnesium alloy sheets undergoing continuous bending process
Ting-zhuang HAN1,2, Guang-sheng HUANG1,2,3, You-gen WANG1,2, Guan-gang WANG1,2, Yan-chun ZHAO1,2, Fu-sheng PAN1,2,3

1. State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering,
Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
3. Chongqing Research Center for Advanced Materials, Chongqing Academy of Science & Technology,
Chongqing 401123, China

Abstract: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).


Key words: AZ31 magnesium alloy; continuous bending; twinning; detwinning; microstructure; formability

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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