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Materials 2018, 11(8), 1401; https://doi.org/10.3390/ma11081401

Enhanced Stretch Formability of AZ31 Magnesium Alloy Thin Sheet by Induced Precompression and Sequent Annealing

1
Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan 030024, China
2
Faculty of Materials and Energy, Southwest University, Chongqing 400715, China
3
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
4
College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 6 August 2018 / Accepted: 8 August 2018 / Published: 10 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

In this study, precompression deformation with a strain level of 5.38% along the transverse direction (TD) at room temperature was conducted on a AZ31 magnesium alloy thin sheet with thickness of 1mm. Then subsequent annealing treatment was carried out at various temperatures (200, 300, 400, and 500 °C) to induce static recrystallization (SRX) and grain growth. The stretch formability was also investigated using the hemispherical test. The results showed that the twinning texture induced by the precompression process was nearly inherited by recrystallized grains after annealing process. Grains grew up and the size increased with the increase of annealing temperature. The largest grain size was obtained when annealing at 400 °C. The mechanical properties including strength and ductility decreased due to the development of coarse grains, however, the stretch formability was enhanced significantly. Indeed, the IE-value increased from 2.83 mm in the as-received Mg alloy sheet to 5.78 mm in the precompressed and 400 °C annealed specimens, leading to an improvement of 104%. This was ascribed to the rotated grain orientation and higher activity of (10–12) twins in coarse grains. View Full-Text
Keywords: precompression; annealing; grain growth; texture; stretch formability precompression; annealing; grain growth; texture; stretch formability
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Wang, L.; Song, B.; Zhang, Z.; Zhang, H.; Han, T.; Cao, X.; Wang, H.; Cheng, W. Enhanced Stretch Formability of AZ31 Magnesium Alloy Thin Sheet by Induced Precompression and Sequent Annealing. Materials 2018, 11, 1401.

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