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Home > Archive>Volume 51, Issue 10, 2022 >3574-3579. DOI:10.12442/j.issn.1002-185X.20210946
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Twinning Behavior in Extruded AZ31 Alloy Under Low Strain Deformation
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Affiliation:

1.Department of Mechanical and Electrical Engineering, Changsha University, Changsha 410003, China;2.Bichamp Cutting Technology (Hunan) Co., Ltd, Changsha 410200, China;3.College of Material Science and Engineering, Hunan University, Changsha 410082, China

Fund Project:

Changsha University Talent Introduction Project (50800-92808); Excellent Youth Project of Hunan Provincial Department of Education (18B418, 19B055, 19C0156, 19A118); Natural Science Foundation of Hunan Province of China (2020JJ4645)

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    Abstract:

    Tension parallel to the radial direction (RDT) and compression along the extrusion direction (EDC) of an extruded AZ31 Mg alloy bar were conducted under a strain rate of 10-4 s-1 at room temperature. Twinning behavior was characterized by optical microscopy (OM) and electron backscatter diffraction (EBSD). The results demonstrate that extension twins have an effect on the yield point; the yield point of the alloy under EDC is 139 MPa which is higher than 88 MPa of the alloy under RDT. With increasing strain, strain hardening rates under these two stress states show a trend of fast decline at first, and then the hardening rates under EDC start to increase obviously till fracture while that under RDT keeps almost a constant. The increase in the hardening rate under EDC is related to the formation of extension twins and the twinning texture-induced slip activity. A method to measure the twin volume fraction in grains based on EBSD results was proposed. Under RDT, the volume fraction of extension twin in (0002) grains is about 45% at the strain of 0.04.

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[Wu Yiping, Jia Yuzhen, Zhang Sha, Xiong Hanqing, Xie Shaohui, Chen Gang. Twinning Behavior in Extruded AZ31 Alloy Under Low Strain Deformation[J]. Rare Metal Materials and Engineering,2022,51(10):3574~3579.]
DOI：10.12442/j. issn.1002-185X.20210946

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History
  • Received:November 01,2021
  • Revised:September 13,2022
  • Adopted:February 28,2022
  • Online: October 31,2022
  • Published: October 28,2022

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