Journal
MATERIALS
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/ma11050757
Keywords
Mg-Gd-Y-Ag-Zr alloy; rolling; thermal treatment; microstructure; mechanical property
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Funding
- National Natural Science Foundation of China [51601003]
- Natural Science Foundation of Heilongjiang Province of China [QC2017061]
- Harbin Science and Technology Bureau [2017RAQXJ066]
- Science Foundation for Young Scientists of Jiangsu, China [BK20140779]
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Grain refinement and precipitation are two effective ways to improve the mechanical properties of Mg-RE alloys. In this work, a two-step forming process is proposed. This includes cold rolling and subsequent annealing at high temperature for a short duration. By the two-step forming process, grains can be refined from 100 mu m to 20 mu m in compare with similar to 30 mu m by common hot rolling at 450 degrees C for a reduction of 80%. The sample shows more distinct aging hardening, as the hardness amplification of 60 HV is twice that of the hot-rolled sample. The precipitation is observed by high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Dynamic precipitation in the sample by the two-step route is found to be effectively suppressed. Interestingly, after subsequent annealing, the density of precipitation, especially beta', become much higher than that in hot-rolled samples.
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