Journal
MATERIALS LETTERS
Volume 327, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.133048
Keywords
Mg-RE-Ag alloy; Microstructure; Age-hardening; Heat treatment
Funding
- National Natural Science Foundation of China [51804090, 51971086]
- Natural Science Foundation of Heilongjiang Province [LH2020E119]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2020184]
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The influences of Ag addition and heat treatment on the precipitates evolution and high-temperature mechanical properties of a novel Mg alloy were investigated. The addition of Ag induced the precipitation of multiple phases, resulting in the formation of a special enclosed precipitates structure. This structure effectively blocked dislocation slip and improved the hardness and strength of the alloy.
The influences of Ag addition and heat treatment on precipitates evolution and high-temperature mechanical properties of a novel Mg-6Gd-2Y-Nd-0.4Zn-0.5Zr (GWN) alloy were investigated. The addition of Ag induced the precipitation of basal gamma '' phase and prismatic beta ' phase simultaneously resulting in the formation of special enclosed precipitates structure. Compared with the alloy without Ag, the peak hardness increased by 8.9%, while the ultimate tensile strength, yield strength and elongation at 250 degrees C increased by 24.8%, 23.9% and 7.6%, respectively, by adding 1.5 wt% Ag. The enclosed precipitates structure can effectively block dislocation slip, which is the primary reason for enhancing mechanical properties. Hence, the construction of the special enclosed precipitates structure provides an effective approach for designing and developing heat-resistant Mg alloys for aerospace applications.
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