Notch fracture toughness of body-centered-cubic (TiZrNbTa)-Mo high-entropy alloys
Wang, Shao-Ping1,2; Ma, Evan3; Xu, Jian1
Corresponding AuthorXu, Jian(
Source PublicationINTERMETALLICS
AbstractThe notch fracture toughness (K-Q) and its dependence on Mo concentration in as-cast body-centered-cubic (TiZrNbTa)(100-x)Mo-x high-entropy alloys have been measured at room temperature. It is shown that the increase of Mo concentration results in a significant reduction in fracture toughness, with the K-Q decreasing from 28.5 MPa root m for the Mo-free TiZrNbTa quaternary alloy to 18.7 MPaVin for the TiZrNbTaMo quinary alloy. The K-Q of these HEAs scales inversely with increasing (d + s) electrons per atom. The fracture mode under Mode I loading transists from monolithic intergranular fracture for Mo-free TiZrNbTa to completely transgranular cleavage for the TiZrNbTaMo alloy. The brittleness is consistent with the known effects of refractory solutes on increasing the brittle-to-ductile transition temperature in Nb-based solutions. The embrittlement effect with alloying (especially Mo) is also attributable to the elevation of the critical temperature (T-0), making the activation to overcome lattice resistance to dislocation motion increasingly difficult. The low ratio T/T-0 (T = 300 K in our case) can in fact be inferred from the very small activation volume (3b(3)) measured for TiZrNbTa and TiZrNbTaMo.
KeywordHigh-entropy alloys Fracture toughness BCC structure Nanoindentation Dislocation
Funding OrganizationNational Natural Science Foundation of China ; US NSF-DMR
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51571192] ; US NSF-DMR[1505621]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000450380700010
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Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXu, Jian
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
3.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
Recommended Citation
GB/T 7714
Wang, Shao-Ping,Ma, Evan,Xu, Jian. Notch fracture toughness of body-centered-cubic (TiZrNbTa)-Mo high-entropy alloys[J]. INTERMETALLICS,2018,103:78-87.
APA Wang, Shao-Ping,Ma, Evan,&Xu, Jian.(2018).Notch fracture toughness of body-centered-cubic (TiZrNbTa)-Mo high-entropy alloys.INTERMETALLICS,103,78-87.
MLA Wang, Shao-Ping,et al."Notch fracture toughness of body-centered-cubic (TiZrNbTa)-Mo high-entropy alloys".INTERMETALLICS 103(2018):78-87.
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