Quick Search:       Advanced Search
刘筱,朱必武.高速冲击载荷下LZ91镁合金的动态变形行为及力学本构[J].稀有金属材料与工程(英文),2019,48(7):2171~2178.[Liu Xiao and 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.]
The dynamic deformation behavior and mechanical constitutive of LZ91 magnesium alloy under high speed impacting
Download Pdf  View/Add Comment  Download reader
Received:March 06, 2018  Revised:April 14, 2018
DOI:
Key words: LZ91 magnesium alloy  Adiabatic shear  Texture  Burgers orientation relationship  Johnson-Cook constitutive equation
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),
Author NameAffiliation
Liu Xiao and Zhu Biwu  
Hits: 137
Download times: 0
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.