材料科学
退火(玻璃)
微观结构
合金
层状结构
再结晶(地质)
冶金
延展性(地球科学)
粒度
高熵合金
复合材料
热机械加工
蠕动
古生物学
生物
作者
Caroline Nazaré Gonçalves,Moses J. Paul,Richard F. Webster,Charlie Kong,Bernd Gludovatz,Guilherme Zepon,Francisco Gil Coury,Eric M. Mazzer
标识
DOI:10.1016/j.jallcom.2023.172585
摘要
The impact of warm-rolling at 773 K to 76% and 90% thickness reduction on the microstructure and mechanical properties of an equiatomic CrMnFeCoNi high entropy alloy is compared to material that is cold-rolled and subsequently annealed between 673 and 1173 K. While cold-rolling significantly improves hardness and yield strength, subsequent annealing with increasing temperature improves ductility due to stress-relaxation, recovery, and recrystallization of the elongated grain structure which simultaneously reduces hardness and strength. Compared to the cold-rolled condition, however, annealing at 773 K increases hardness and strength as well as ductility which may be associated with the onset of chemical ordering combined with a lack of the formation of precipitates. Warm-rolling at 773 K, on the other hand, results in partially recrystallized microstructures without mechanical nanotwins. While the 76% deformed material exhibits mechanical properties that are comparable to the cold-rolled and annealed materials, the 90% warm-rolled material shows significantly improved hardness compared to the cold-rolled material, similar strength, but improved plastic failure strains. These properties are associated with the formation of a fine lamellar deformation structure and the onset of the precipitation of Cr-rich particles during rolling. Our results reveal that warm-rolling may enable an efficient pathway to obtain structure-property relationships in HEAs that can otherwise only be obtained in a multi-step processing procedure.
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