Comparison of the Strain Rate Sensitivity in AZ31 and WE43 Magnesium Alloys under Different Loading Conditions
Yudong Lei,
Mei Zhan,
Hai Xin,
Lifeng Ma,
Yuan Yuan,
Hongrui Zhang,
Zebang Zheng
Affiliations
Yudong Lei
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
Mei Zhan
State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Hai Xin
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
Lifeng Ma
Heavy Machinery Engineering Research Center, Ministry of Education, Taiyuan University of Science and Technology, Taiyuan 030024, China
Yuan Yuan
National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Hongrui Zhang
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
Zebang Zheng
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
The initial texture effect of strain rate sensitivity response in magnesium alloys was studied using the quasi in situ electron backscatter diffraction technique. The strain accumulations, under uniaxial loading of both tensile and compression along the rolling direction, showed strain rate dependency. For the AZ31 magnesium sheets with strong basal texture (max intensity to 11.2), twinning first occurs at the onset of plastic deformation, resulting in macroscopic strain rate insensitivity. With further loading, the strain rate sensitivity significantly increases (with the strain rate sensitivity coefficient m increased from 0.0025 to 0.012), arising from the initiation of slip. For the WE43 alloy sheets with weak basal texture (max intensity to 2.6), the overall deformation is sensitive to strain rate under both tensile and compression. The twinning growth rate and twinned volume fraction have been used to identify whether the process is twin-dominated or slip-dominated during the plastic deformation of a magnesium alloy.
