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Microstructure evolution and mechanical properties of directionally solidified Ni36Co30Fe11Cr11Al8Nb4 high entropy alloy

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2023)

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Microstructure evolution and strengthening mechanisms in Ni36Co30Cr11Fe11Al12-xNbx high entropy alloys

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Summary: Designed Ni36Co30Cr11Fe11Al12-xNbx (x = 2, 4, 6, 8, 10 at%) high entropy alloys (HEAs) were studied to reveal microstructure evolution and strengthening mechanism. The alloys consist of face-centered cubic (FCC) phases and Laves phases. The increase of Nb/Al ratio was predicted to increase the volume fraction of Laves phase. The Ni36Co30Cr11Fe11Al8Nb4 HEA showed a yield strength of 670 MPa and a strain of 16.5%. The effects of solid solution strengthening and interfacial strengthening were analyzed, with interfacial strengthening being stronger when Nb content > 6 at%. The incoherent interface exhibited extensive dislocation pileups, leading to decreased ductility.

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Evolution of microstructure homogeneity and mechanical properties in nano-/ultrafine eutectic CoCrFeNiNbx (0.45 ≤ x ≤ 0.65) high entropy alloy ingots and cast rods

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Microstructure and mechanical property of novel L12 nanoparticles-strengthened CoFeNi-based medium entropy alloys

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Formation of hypoeutectic structure and strengthening mechanism of Co4Cr1.5Fe1.5Ni5 high entropy alloy alloyed by Al

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