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Article: Crack tip dislocation activity in refractory high-entropy alloys

TitleCrack tip dislocation activity in refractory high-entropy alloys
Authors
Issue Date15-Sep-2023
PublisherElsevier
Citation
International Journal of Mechanical Sciences, 2023 How to Cite?
Abstract

Dislocation activities play an important role in the deformation and failure of refractory high-entropy alloys (RHEAs). However, the impact of chemical short-range ordering (SRO) on dislocation activities at a crack tip in RHEAs remains unclear. Here, we investigate the effect of SRO on the dislocation nucleation, propagation, and reaction at a crack tip in a body-centered-cubic (BCC) MoTaTiWZr RHEA, using a combination of molecular dynamic simulations and Monte Carlo methods. Our results indicate that this RHEA is energetically favorable to form SRO, developing a pseudo-composite microstructure with low-energy clusters (LECs), medium-energy clusters (MECs), and high-energy clusters (HECs). The HECs at the crack tip are favorable sites for dislocation nucleation whereas the MECs surrounding the HECs function as a strong matrix to stabilize the weak HECs. At elevated temperatures, the HECs near the crack tip transform to severely distorted BCC and disordered structures, which can cause the breakup, absorption, and annihilation of emitted dislocations and nucleation of new dislocations. Our work reveals the interesting role of SRO in altering the dislocation activities at the crack tip of RHEAs and suggests alternative routes for designing superior RHEAs at both room and elevated temperatures.


Persistent Identifierhttp://hdl.handle.net/10722/332009
ISSN
2023 Impact Factor: 7.1
2023 SCImago Journal Rankings: 1.650

 

DC FieldValueLanguage
dc.contributor.authorChen, Shuai-
dc.contributor.authorAitken, Zachary H-
dc.contributor.authorPattamatta, Subrahmanyam-
dc.contributor.authorWu, Zhaoxuan-
dc.contributor.authorYu, Zhi Gen-
dc.contributor.authorSrolovitz, David J-
dc.contributor.authorLiaw, Peter K-
dc.contributor.authorZhang, Yong-Wei-
dc.date.accessioned2023-09-28T05:00:13Z-
dc.date.available2023-09-28T05:00:13Z-
dc.date.issued2023-09-15-
dc.identifier.citationInternational Journal of Mechanical Sciences, 2023-
dc.identifier.issn0020-7403-
dc.identifier.urihttp://hdl.handle.net/10722/332009-
dc.description.abstract<p>Dislocation activities play an important role in the deformation and failure of refractory high-entropy alloys (RHEAs). However, the impact of chemical short-range ordering (SRO) on dislocation activities at a crack tip in RHEAs remains unclear. Here, we investigate the effect of SRO on the dislocation nucleation, propagation, and reaction at a crack tip in a body-centered-cubic (BCC) MoTaTiWZr RHEA, using a combination of molecular dynamic simulations and Monte Carlo methods. Our results indicate that this RHEA is energetically favorable to form SRO, developing a pseudo-composite microstructure with low-energy clusters (LECs), medium-energy clusters (MECs), and high-energy clusters (HECs). The HECs at the crack tip are favorable sites for dislocation nucleation whereas the MECs surrounding the HECs function as a strong matrix to stabilize the weak HECs. At elevated temperatures, the HECs near the crack tip transform to severely distorted BCC and disordered structures, which can cause the breakup, absorption, and annihilation of emitted dislocations and nucleation of new dislocations. Our work reveals the interesting role of SRO in altering the dislocation activities at the crack tip of RHEAs and suggests alternative routes for designing superior RHEAs at both room and elevated temperatures.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofInternational Journal of Mechanical Sciences-
dc.titleCrack tip dislocation activity in refractory high-entropy alloys-
dc.typeArticle-
dc.identifier.doi10.1016/j.ijmecsci.2023.108753-
dc.identifier.eissn1879-2162-
dc.identifier.issnl0020-7403-

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