Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 179, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.105660
Keywords
Magnesium alloys; Ratchetting; Dislocation slipping; Twinning; Detwinning; Crystal plasticity
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Funding
- National Natural Science Foundation of China [11602203]
- Young Elite Scientist Sponsorship Program by CAST [2016QNRC001]
- Fundamental Research Funds for the Central Universities [2682018CX43]
- Doctoral Innovation Fund Program of Southwest Jiaotong University
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A crystal plasticity model considering dislocation slipping, twinning and detwinning mechanisms is constructed to model the uniaxial ratchetting of polycrystalline extruded magnesium (Mg) alloys. The dislocation slipping on the basal , prismatic and pyramidal slip systems in both the parent and twinned regions, the twinning on the extension twinning systems, and the detwinning, an inverse process of twinning, are considered simultaneously. Two different linear kinematic hardening rules are proposed, which characterize the evolutions of back stresses driving the twinning and detwinning processes, respectively. An explicit beta-rule is adopted to acquire the response of polycrystalline aggregates. The developed constitutive model is validated by comparing the predictions with the corresponding experiments for the uniaxial ratchetting of AZ31 Mg alloys with various stress levels, where the dislocation slipping, twinning and detwinning are activated simultaneously or individually.
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