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JOM

, Volume 70, Issue 11, pp 2468–2474 | Cite as

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

  • Lei WangEmail author
  • Hengxin Xu
  • Jun Shen
  • Yunpeng Zhang
  • Tao Wang
  • Yuhui Ge
  • Luhan Gao
  • Guojun Zhang
Advances in Superalloys and Other High-Temperature Alloys
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  • 152 Downloads

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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Notes

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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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Lei Wang
    • 1
    Email author
  • Hengxin Xu
    • 1
  • Jun Shen
    • 2
  • Yunpeng Zhang
    • 1
  • Tao Wang
    • 1
  • Yuhui Ge
    • 1
  • Luhan Gao
    • 1
  • Guojun Zhang
    • 1
  1. 1.School of Materials Science and EngineeringXi’an University of TechnologyXi’anPeople’s Republic of China
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China

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