首页|Microstructure and mechanical property of novel NiAl-based hypoeutectic/eutectic/hypereutectic high-entropy alloy

Microstructure and mechanical property of novel NiAl-based hypoeutectic/eutectic/hypereutectic high-entropy alloy

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  • NSTL
  • Elsevier
? 2022 Elsevier LtdIn this paper, we investigate the microstructures and mechanical properties of novel NiAl-MoxCrxVx, NiAl-MoyCryFey and NiAl-MozCrzVzFez eutectic high-entropy alloy (EHEA) systems. The microstructures of three alloy systems change from hypoeutectic (primary NiAl + eutectic, x = 7.5,8.33/y = 13.33,14.0/z = 9.0,9.5, hypo-EHEA) to eutectic (x = 8.7/y = 14.5/z = 10.0, EHEA) and then to hypereutectic (primary MoCrV/MoCrFe/MoCrVFe + eutectic, x = 9.0,10.0/y = 15.0,16.0/z = 10.5,11.0, hyper-EHEA). The microhardness of primary MoCrV/MoCrFe/MoCrVFe is higher than that of primary NiAl. It almost has a rule that the yield strength gradually increases from hypo-EHEA to EHEA, and then to hyper-EHEA, which is attributed to a certain amount of high-microhardness primary MoCrV/MoCrFe/MoCrVFe phase in hyper-EHEA. For the EHEAs, the microstructures of NiAl–Mo8.7Cr8.7V8.7/NiAl–Mo14.5Cr14.5Fe14.5/NiAl–Mo10Cr10V10Fe10 are composed of eutectic cells or eutectic dendrites which consist of NiAl (B2) and MoCrV/MoCrFe/MoCrVFe (BCC) lamellar phases, respectively. It is also found that the plenty of fine (Ni,Al)-rich precipitates occur in MoCrFe and MoCrVFe phases (SEM images). Moreover, according to the phase composition, it is determined that MoCrV/MoCrFe/MoCrVFe is a high entropy phase, thus possessing a better strengthening effect on NiAl. Correspondingly, three EHEAs possess the good mechanical properties, and the microhardness and the yield strength exhibit an increased trend: NiAl–Mo8.7Cr8.7V8.7 < NiAl–Mo14.5Cr14.5Fe14.5 < NiAl–Mo10Cr10V10Fe10 EHEAs. The major strengthening mechanisms are the solution strengthening and the precipitation strengthening.

Eutectic high entropy alloy (EHEA)Mechanical propertiesMicrostructureNiAl-based EHEA

Wang L.、Su Y.、Yao C.、Huang Y.、Zhang Y.、Liu G.、Zhang G.、Shen J.、Zhao P.

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School of Materials Science and Engineering Xi'an University of Technology

State Key Laboratory of Solidification Processing Northwestern Polytechnical University

School of Mechanical and Instrument Engineering Xi'an University of Technology

2022

10.1016/j.intermet.2022.107476

Intermetallics

Intermetallics

EISCI
ISSN：0966-9795
年,卷(期)：2022.143
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