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- Title
预压缩变形Mg-Zn-Y-Zr合金的微观组织及时效硬化效应.
- Authors
林小娉; 唐琴; 叶杰; 刘宁宁; 孙衡; 徐丹
- Abstract
The as-cast Mg-8.14Zn-1.44Y-0.47Zr alloy was deformed by 0%~5% pre-compression and then isothermal aged at 160 °C. The deformed microstructure and its influence on the subsequent aging microstructure and aging hardening effect were investigated by EBSD, TEM and et al. The results showed that the pre-deformed Mg alloy introduces {1012} tensile twin and low-angle grain boundaries (dislocation) , the percentage of low-angle grain boundary increases from 2.6% at the pre-deformation of 1% to 15.3% at the pre-deformation of 5%. With increasing the amount of pre-deformation, the number of {1012} tensile twin firstly increases and then shows a decrease trend. During the 160 °C aging process, the twin boundary become an effective substrate for the preferential precipitation of quasiciystal I-Mg3Zn6Y. The presence of dislocations in the matrix promotes the precipitation of rod shaped or disc shaped β1'-MgZn2 phases, which improves the precipitation rate and the near-peak aging hardness at the initial period of aging. The time for reaching the near-peak age-hardening hardness at 5% pre-deformation is shortened from 12 h ( without pre-deformation) to 6 h, and the near-peak hardness increases from HV 81.5 (without pre-deformation) to HV 104.8.
- Publication
Journal of the Chinese Society of Rare Earths, 2019, Vol 37, Issue 2, p217
- ISSN
1000-4343
- Publication type
Article
- DOI
10.11785/S1000-4343.20190210