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Home > Archive>Volume 48, Issue 7, 2019 >2171-2178. DOI:10.12442/j.issn.1002-185X.20180189
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The dynamic deformation behavior and mechanical constitutive of LZ91 magnesium alloy under high speed impacting
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1.School of Materials Science and Engineering, Hunan University of Science and Technology;2.Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province, Hunan University of Science and Technology

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    Abstract:

    The dynamic deformation behavior and mechanical constitutive of LZ91 magnesium alloy were investigated under high speed impacting using optical microscopy and X-Ray diffraction combing with Schmid factor. The results show that the flow stresses are not sensitive to strain rate and the Portevin-LeChatelier effect occurs. The fine α-Mg phase uniformly distributes in β-Li phase, causing that the dislocation motions are hindered. This finally induces that the adiabatic shear sensitivity decreases and the adiabatic shear band only occurs above 3600s-1. The special texture, which deviates the basal texture nearly 20-30°, in α-Mg phase forms, due to the Burgers orientation relationship between α/β phase interface. Twinning is not required to accommodate the uniform plastic deformation in α-Mg phase because of this orientation relationship. The Johnson-Cook (J-C) mechanical constitutive was modified and the fitting results well match with the experimental results.

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[Liu Xiao, Zhu Biwu. The dynamic deformation behavior and mechanical constitutive of LZ91 magnesium alloy under high speed impacting[J]. Rare Metal Materials and Engineering,2019,48(7):2171~2178.]
DOI：10.12442/j. issn.1002-185X.20180189

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History
  • Received:March 06,2018
  • Revised:April 14,2018
  • Adopted:April 26,2018
  • Online: August 01,2019

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