Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 5, Pages 1242-1255Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2021.01.009
Keywords
Mg alloy; Grain refinement; Surface severe plastic deformation; MD simulations
Categories
Funding
- National Key Research and Development Program of China [2018YFE0124900]
- National Natural Science Foundation of China [51861165204, 51778370, 51701171, 51971187]
- Natural Science Foundation of Guangdong [2017B030311004]
- Shenzhen Science and Technology Project [GJHZ20180928155819738]
- Partner State Key Laboratories in Hong Kong from the Innovation and Technology Commission (ITC) [1-BBXA]
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In this study, the single point diamond turning technique was used to improve the mechanical properties of magnesium alloys. By refining the surface grains to the nanometer scale, the surface hardness was enhanced. Molecular dynamics simulations were conducted to study the atomic plastic deformation mechanism and the effects of different parameters. The results suggest that increasing the rake angle, cutting speed, and cutting depth can achieve better grain refinement.
Magnesium (Mg) based alloys are promising candidates for many applications, but their untreated surfaces usually have low strength and hardness. In this study, a single point diamond turning (SPDT) technique was applied to refine the grain size and improve the mechanical properties of the surface layers of Mg-Li alloys. By refining grains in the topmost layer to the nanometer scale (similar to 60 nm), the surface hardness was found to be enhanced by approximately 60%. The atomic plastic deformation process during the SPDT was then studied by the real-time atomistic molecular dynamics (MD) simulations. A series of MD simulations with different combinations of parameters, including rake angle, cutting speed and cutting depth, were conducted to understand their influences on the microstructural evolution and associated plastic deformation mechanisms on the surface layer of the workpieces. The MD simulation results suggest that using increased rake angle, cutting speed and cutting depth can help to achieve better grain refinement. These simulation results, which provide atomic-level details of the deformation mechanism, can assist the parameter design for the SPDT techniques to achieve the high-performance heterogeneous nanostructured materials. (C) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.
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