Solid solution softening or hardening induced by minor substitutional additions in a Hf 20 Nb 31 Ta 31 Ti 18 refractory high entropy alloy

Li, Xiaolong,1991Chalmers tekniska högskola,Chalmers University of Technology (författare)

The effect of minor additions of substitutional elements such as Al, Cu, Mn, and Fe on the room-temperature (RT) and elevated-temperature hardness of a single bcc phase Hf20Nb31Ta31Ti18 refractory high entropy alloy is studied here. Interestingly, 2.5 at. % nominal addition of Fe hardened the base Hf20Nb31Ta31Ti18 alloy in the temperature range from RT to 800 °C, while the same nominal content of addition of Al, Cu, and Mn softened the base alloy from RT to 1000 °C. Regardless of solid solution hardening or solid solution softening, the hardness variation with temperature essentially showed the same three-stage pattern for all studied alloys here: a temperature-dependent decrease in hardness below 300 °C/400 °C, followed by a temperature-independent hardness plateau between 300/400 and 800 °C, and finally a temperature-dependent decrease in hardness at temperatures higher than 800 °C. The mechanism for solid solution hardening or softening in bcc-structured refractory high entropy alloys is discussed, together with their temperature dependence.

Jin, LuNational Institute for Materials Science (NIMS),Shibaura Institute of Technology (författare)
Mao, H. H. (författare)
Murakami, HideyukiWaseda University,National Institute for Materials Science (NIMS) (författare)
Guo, Sheng,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)shengg (författare)
Chalmers tekniska högskolaNational Institute for Materials Science (NIMS) (creator_code:org_t)

Av författaren/redakt...: Li, Xiaolong, 19 ...; Jin, Lu; Mao, H. H.; Murakami, Hideyu ...; Guo, Sheng, 1981

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Metallurgi och m ...

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