Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 715, Issue -, Pages 266-275Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.01.010
Keywords
Magnesium alloy; Ductility; Critical resolved shear stress; Atomistic simulation; TEM
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016R1A2B4006680]
- WPM Program - Ministry of Trade, Industry and Energy, South Korea
- National Research Foundation of Korea [2016R1A2B4006680] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Improving room temperature ductility and formability is a bottleneck for a wide industrial application of Mg alloys, but even the mechanism for the effect of alloying elements on the deformation behavior of Mg is not clearly known. Here, using a molecular dynamics simulation, we clarify the role of alloying elements in improving the room temperature ductility of Mg alloys: Solute atoms have stronger dislocation binding tendency and solid solution strengthening effect on basal < a > slip planes than on non-basal < c + a > slip planes, reduce the anisotropy in the critical resolved shear stress between slip systems, and eventually improves the room temperature ductility. We predict that any solute elements with a size difference from Mg can improve the room temperature ductility, once the alloying amount is carefully controlled. By proving the validity of the prediction experimentally, we provide a new guide for designing Mg alloys with improved room temperature ductility and formability.
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