Effect of Chemical Composition on Grain Refinement of AlxCoCrFeNi High Entropy Alloys with NiAl Grain Boundary Precipitates

Hiroyuki Y. Yasuda; Hiroyuki Miyamoto; Takuya Inagaki; Ken Cho; Takeshi Nagase

doi:10.4028/www.scientific.net/MSF.1016.1690

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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Effect of Chemical Composition on Grain Refinement...

Effect of Chemical Composition on Grain Refinement of Al_xCoCrFeNi High Entropy Alloys with NiAl Grain Boundary Precipitates

Abstract:

In Al_xCoCrFeNi high entropy alloys (x = 0.3–0.5), the NiAl phase with the B2 structure is precipitated rapidly along the fcc grain boundaries. During recrystallization after conventional cold rolling, the NiAl precipitates effectively suppress the grain growth, which results in the ultrafine-grained microstructure. It should be noted that no severe plastic deformation is necessary to obtain the microstructure. The volume fraction of the NiAl precipitates increases with increasing x. As a result, the average grain size of the fcc matrix (d_m) after the recrystallization decreases with increasing x, and therefore, a minimum d_m of 0.5 μm can be obtained at x = 0.5. The grain refinement by the NiAl precipitates is consistent with the Zener-Smith model. At x = 0.5, the alloy with d_m = 0.5 μm exhibits a yield stress of 1163 MPa and an elongation of 24% at room temperature.

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Materials Science Forum (Volume 1016)

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1690-1695

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https://doi.org/10.4028/www.scientific.net/MSF.1016.1690

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Online since:

January 2021

Authors:

Hiroyuki Y. Yasuda*, Hiroyuki Miyamoto, Takuya Inagaki, Ken Cho, Takeshi Nagase

Keywords:

Grain Boundary, Grain Refining, Hall-Petch Law, High Entropy Alloys, Precipitates

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