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Effects of high strain-rate rolling on microstructure and properties of the Mg-4Zn alloy
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School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China

Clc Number:

TG146.2；R 318.08

Fund Project:

National High Technology Research and Development Program of China (“863” Program) (2009AA05Z120)

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    Abstract:

    Effects of high strain-rate rolling on microstructure, mechanical properties and corrosion resistance of Mg-4Zn alloy were investigated by optical microscope (OM), scanning electron microscope (SEM), mass loss of immersion test and tensile testing. The results showed that high strain-rate rolling after solution treatment produced homogenous dynamic recrystallization (DRX) with final grain size of 4 μm leading to a significant mechanical property improvement. The tensile strength, yield strength and elongation were 285MPa, 180MPa and 27.4% respectively. The solutionized and the as-rolled alloys had better corrosion resistance than the as-cast, exhibiting a uniform filiform corrosion due to the lower fraction and the finer size of the second phase. The as-rolled alloy showed the best corrosion resistance with the average corrosion rate of 0.25 mg/cm2.d, about 1/5 of the as-cast alloy after soaking in Hank’s solution for 15 days. It also showed the highest residual tensile strength ( 215MPa), far above the as-cast and the solutionized alloys.

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[Chen Jihua, Zou Zhengyang, Yan Hongge, Xie Ruihong, Shi Yangjian, Gong Xiaole, Huang Jiangling. Effects of high strain-rate rolling on microstructure and properties of the Mg-4Zn alloy[J]. Rare Metal Materials and Engineering,2017,46(8):2220~2226.]
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History
  • Received:April 13,2015
  • Revised:December 11,2015
  • Adopted:December 11,2015
  • Online: November 16,2017

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