Temperature-Dependent Yield Strength of Nanoprecipitate-Strengthened Face-Centered Cubic High Entropy Alloys: Prediction and Analysis

Ziyuan Zhao; Zheng Shen; Pan Dong; Yi He; Jianzuo Ma; Yanli Ma; Jiabin Yang; Weiguo Li

doi:10.1007/s12540-022-01331-4

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자료유형: 학술저널

저자정보: Ziyuan Zhao (Chongqing University) Zheng Shen (Chongqing University) Pan Dong (Chongqing University) Yi He (Chongqing University) Jianzuo Ma (Chongqing University) Yanli Ma (Chongqing University) Jiabin Yang (Chongqing University) Weiguo Li (Chongqing University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6

발행연도: 2023.6

수록면: 1,723 - 1,738 (16page)

DOI: 10.1007/s12540-022-01331-4

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Nanoprecipitate-strengthened face-centered cubic high entropy alloys (NSFCC-HEAs) have huge potential for engineeringapplications due to their outstanding mechanical performance at extremely cryogenic temperatures. In this work, a temperature-dependent yield strength predictive theoretical model of NSFCC-HEAs was established by considering the evolutionof main influence mechanisms with temperature, such as lattice friction stress, grain boundary strengthening, and precipitationstrengthening. Only requiring some physical parameters at room temperature, the model can achieve good predictionsof yield strength of NSFCC-HEAs at different temperatures, especially at extremely cryogenic temperatures, as verified byavailable experimental results. Furthermore, the contribution evolutions of each mechanism with temperature were quantitivelyanalyzed by using the present model. It revealed theoretically that lattice friction and short-range order strengtheningare the main mechanisms determining the temperature dependence of NSFCC-HEAs. In addition, the influences of grainsize, precipitate size, and precipitate volume fraction were analyzed. The scope of applicability of the model was discussed.The model can provide a method to help save time and resources by reducing cryogenic temperature testing, and deepeningthe understanding of the relationship between microstructure and yield strength of NSFCC-HEAs at different temperatures.More importantly, the customized cryogenic-temperature strength of NSFCC-HEAs is expected to be achieved through apriori theoretical prediction by selecting the basic material parameters and the corresponding processing technology.

#High entropy alloys · Extremely cryogenic temperature · Temperature-dependent yield strength · Theoretical model · Customized design

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