Jia Li
(, ), Siwei Ren
(, ), Bin Liu
(, ), Peter K. Liaw, Qihong Fang
(, )
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The increasing temperature reduces the strain-hardening rate and the amplitude of fluctuations in the flow stress, due to the reduction of the solute concentration for the annealed structure. The deformation twinning plays a certain role in the deformation mechanism in comparison with dislocation, and the local deformation is further accommodated via the dislocation-based plasticity, and amorphous nucleation in the grains. The existence of the ordered structure affects the stress and strain partition dependent upon the mechanical properties. The solid solution strengthening and grain boundary strengthening contribute considerably to the flow stress, and twinning strengthening contributes relatively little to the flow stress. Our atomic simulation and model give valuable insights into the deep understanding of chemistry and temperature related to the deformation behaviour of RHEAs.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of chemistry and temperature on mechanical behavior and deformation mechanisms of refractory high-entropy alloys: an integrated simulation-modeling analysis\",\"authors\":\"Jia Li \\n (, ), Siwei Ren \\n (, ), Bin Liu \\n (, ), Peter K. 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Influence of chemistry and temperature on mechanical behavior and deformation mechanisms of refractory high-entropy alloys: an integrated simulation-modeling analysis
The equiatomic refractory high-entropy alloys (RHEAs) exhibit the excellent performance at high temperatures, breaking through the upper limits of operating temperatures in the conventional high-temperature alloys. Here, the influences of chemistry and temperature on the deformation mechanisms of the equiatomic MoNbTaW RHEAs are investigated, using the large-scale atomic simulations. According to the microstructure evolution, a microstructure-based constitutive model is established to study the effects of the multiple strengthening mechanisms. The results show the jagged sharp fluctuations of the flow stress with the strain after the strain hardening. The increasing temperature reduces the strain-hardening rate and the amplitude of fluctuations in the flow stress, due to the reduction of the solute concentration for the annealed structure. The deformation twinning plays a certain role in the deformation mechanism in comparison with dislocation, and the local deformation is further accommodated via the dislocation-based plasticity, and amorphous nucleation in the grains. The existence of the ordered structure affects the stress and strain partition dependent upon the mechanical properties. The solid solution strengthening and grain boundary strengthening contribute considerably to the flow stress, and twinning strengthening contributes relatively little to the flow stress. Our atomic simulation and model give valuable insights into the deep understanding of chemistry and temperature related to the deformation behaviour of RHEAs.
期刊介绍:
Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences.
Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences.
In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest.
Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics