期刊
ACTA MATERIALIA
卷 226, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2022.117640
关键词
Nanograined structure; Al -Mg alloy; Thermal stability; Grain boundary relaxation; Grain boundary depletion
资金
- National Natural Science Foundation of China [52171088]
- Ministry of Science and Technology of the People's Republic of China [2017YFA0204401, 2017YFA0700700]
- Chinese Academy of Sciences [zdyz201701]
By means of cryogenic plastic deformation, a high proportion of relaxed grain boundaries can be generated in the Al-5Mg alloy, which is essential for stabilizing nanostructured alloys.
Grain refinement into the nanoscale greatly hardens metals and alloys but reduces the stability. By means of cryogenic plastic deformation at very high strain rates, a high proportion of relaxed grain boundaries (GBs) were generated in an Al-5Mg alloy through emitting partial dislocations from GBs when grain sizes are below a critical value. The nanostructured Al-5Mg alloy with an average grain size of 31 nm exhibited a high hardness of 2.67 GPa and a grain coarsening temperature of about 95 K higher than that of submicro-grains. In addition, Mg depletion rather than segregation at some relaxed GBs was observed, that is in account with considerable compressive strains in the vicinity of the relaxed sigma 9 GB. The re-laxed GBs with Mg depletion are effective in stabilizing the nanostructured Al-Mg alloys. It offers a novel approach to developing stable nanostructured alloys. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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