Effect of boron addition on the microstructure and mechanical properties of refractory Al0.1CrNbVMo high-entropy alloy

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dc.contributor.authorKang, Byungchulko
dc.contributor.authorKong, Taeyeongko
dc.contributor.authorNguyen Huy Danko
dc.contributor.authorDoan Dinh Phuongko
dc.contributor.authorRyu, Ho Jinko
dc.contributor.authorHong, Soon Hyungko
dc.date.accessioned2021-09-08T04:50:23Z-
dc.date.available2021-09-08T04:50:23Z-
dc.date.created2021-09-08-
dc.date.created2021-09-08-
dc.date.issued2021-11-
dc.identifier.citationINTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, v.100-
dc.identifier.issn0263-4368-
dc.identifier.urihttp://hdl.handle.net/10203/287646-
dc.description.abstractThe effect of boron (B) addition on the microstructure and mechanical properties of a refractory high-entropy alloy (RHEA) was investigated. The Al0.1CrNbVMo RHEA was doped with 0.015 at.% of B by the powder metallurgical process, and its mechanical properties were compared with undoped RHEA. The microstructures of the undoped and doped RHEAs consisted of a single body-centered cubic matrix phase with homogeneously distributed Al2O3 inclusions. The doped B atoms segregated along grain boundaries and did not form any boride phases. Boron segregation at the grain boundaries was characterized by atom-probe tomography. Compared with the undoped RHEA, the B-doped RHEA showed improved yield strength of 2933 MPa (15% improvement) and ductility of 25.9% (26% improvement). Adding B transformed the fracture surface from intergranular to transgranular due to enhanced grain boundary cohesion induced by B segregation, which resulted in improved ductility. Quantitative analysis was conducted on the undoped and doped alloys to investigate the effect of B on yield strength. The improved yield strength resulting from B doping was attributed to the combined effects of Orowan, dislocation, and B interstitial strengthening. This work demonstrates that B doping of RHEAs is a promising way to overcome their limited room temperature ductility, while maintaining excellent strength.-
dc.languageEnglish-
dc.publisherELSEVIER SCI LTD-
dc.titleEffect of boron addition on the microstructure and mechanical properties of refractory Al0.1CrNbVMo high-entropy alloy-
dc.typeArticle-
dc.identifier.wosid000687805800002-
dc.identifier.scopusid2-s2.0-85111274886-
dc.type.rimsART-
dc.citation.volume100-
dc.citation.publicationnameINTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS-
dc.identifier.doi10.1016/j.ijrmhm.2021.105636-
dc.contributor.localauthorRyu, Ho Jin-
dc.contributor.localauthorHong, Soon Hyung-
dc.contributor.nonIdAuthorNguyen Huy Dan-
dc.contributor.nonIdAuthorDoan Dinh Phuong-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorHigh-entropy alloy-
dc.subject.keywordAuthorRefractory high-entropy alloy-
dc.subject.keywordAuthorPowder metallurgy-
dc.subject.keywordAuthorBoron-
dc.subject.keywordAuthorGrain boundary segregation-
dc.subject.keywordPlusSTRENGTHENING MECHANISMS-
dc.subject.keywordPlusBEHAVIOR-
dc.subject.keywordPlusCARBON-
dc.subject.keywordPlusPRECIPITATION-
dc.subject.keywordPlusX=0-
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