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Microstructures, Compressive Properties, and Microhardness of NiAl-Cr(Mo) Eutectic Alloys With Various Ni Contents

  • Advances in Superalloys and Other High-Temperature Alloys
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Abstract

The microstructures and mechanical properties of 66(NixAl)-28Cr-6Mo (x = 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5) alloys were investigated using scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscope, microhardness, and compression tests. The microstructure of NiAl-28Cr-6Mo (Ni1.0) eutectic alloy consists of NiAl and Cr(Mo) phases. With increasing the Ni content to 2.0, the microstructure changes from eutectic (Ni1.0) to eutectic + primary NiAl dendrite (Ni1.5 and Ni2.0), and the morphologies of part of precipitates in primary NiAl dendrite evolve from granular to needle-like. When the Ni content increases further, besides eutectic and primary NiAl dendrite, the gray phase forms and is identified as an ordered FCC (L12) (Ni,Cr)3(Al,Mo) phase. Moreover, the more needle-like precipitates emerge in the primary NiAl dendrite of Ni2.5, Ni3.0, and Ni3.5 alloys, and the precipitate is identified as a bcc Cr(Mo) phase. The deep etching reveals that the three-dimensional morphology of Cr(Mo) precipitate is not needle-like but lath-like. Among the investigated alloys, both Ni2.0 and Ni2.5 alloys possess the higher fracture strength and microhardness. The relevant strengthening mechanisms are discussed.

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Acknowledgements

The work is supported by the National Natural Science Foundation of China (51501147, 51601144, 51674196); Natural Science Basic Research Plan in Shaanxi Province of China (2016JQ5013); and the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201509).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, People’s Republic of China

    Lei Wang, Hengxin Xu, Yunpeng Zhang, Tao Wang, Yuhui Ge, Luhan Gao & Guojun Zhang

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Jun Shen

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  1. Lei Wang
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  2. Hengxin Xu
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  3. Jun Shen
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Correspondence to Lei Wang.

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Wang, L., Xu, H., Shen, J. et al. Microstructures, Compressive Properties, and Microhardness of NiAl-Cr(Mo) Eutectic Alloys With Various Ni Contents. JOM 70, 2468–2474 (2018). https://doi.org/10.1007/s11837-018-3082-y

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  • DOI: https://doi.org/10.1007/s11837-018-3082-y

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