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Microstructure and mechanical properties of NiAl-based hypereutectic alloy obtained by liquid metal cooling and zone melted liquid metal cooling directional solidification techniques

Published online by Cambridge University Press:  22 February 2016

Lei Wang ,
Jun Shen ,
Yunpeng Zhang ,
Hengxin Xu  and
Hengzhi Fu
Lei Wang*
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China
Jun Shen
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China
Yunpeng Zhang
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China
Hengxin Xu
Affiliation:
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China
Hengzhi Fu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The microstructure, room temperature compressive property, and elevated temperature tensile property of directionally solidified NiAl–Cr(Mo)–(Hf,Dy) hypereutectic alloy were investigated. The directional solidifications of liquid metal cooling technique (LMC) and zone melted liquid metal cooling technique (ZMLMC) were adopted. In the LMC alloy, the well-aligned and fully eutectic lamellar structure parallel to the growth direction is obtained. The interlamellar spacing gradually decreases with increasing the withdrawal rate, and the compressive yield strength gradually increases. In the ZMLMC alloy, the eutectic lamellar structure is disordered and not parallel to the growth direction, and the quantities of Cr(Mo) primary phases are observed. Compared to the ZMLMC alloy, the LMC alloy has a better combination property because of the well-aligned lamellar structure. The observations of crack propagation and fracture surface are performed to better understand the fracture behavior.

Keywords

directional solidificationmicrostructurestrength
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 5 , 14 March 2016 , pp. 646 - 654
Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Johnson, D.R., Chen, Х.F., Oliver, B.F., Noebe, R.D., and Whittenberger, J.D.: Processing and mechanical properties of in-situ composites from the NiAl-Cr and the NiAl-(Cr,Mo) eutectic systems. Intermetallics 3, 99–113 (1995).CrossRefGoogle Scholar
Noebe, R.D., Bowman, R.R., and Nathal, M.V.: Physical and mechanical properties of the B2 compound NiAl. Int. Mater. Rev. 38, 193–232 (1993).Google Scholar
Yu, D., Bei, H., Chen, Y., George, E.P., and An, K.: Phase-specific deformation behavior of a relatively tough NiAl–Cr(Mo) lamellar composite. Scr. Mater. 84–85, 59–62 (2014).Google Scholar
Chen, X.F., Johnson, D.R., Noebe, R.D., and Oliver, B.F.: Deformation and fracture of a directionally solidified NiAl-28Cr-6Mo eutectic alloy. J. Mater. Res. 10, 1159–1170 (1995).Google Scholar
Misra, A., Gibala, R., and Noebe, R.D.: Optimization of toughness and strength in multiphase intermetallics. Intermetallics 9, 971–978 (2001).CrossRefGoogle Scholar
Shang, Z., Shen, J., Wang, L., Du, Y.J., Xiong, Y.L., and Fu, H.Z.: Investigations on the microstructure and room temperature fracture toughness of directionally solidified NiAl-Cr(Mo) eutectic alloy. Intermetallics 57, 25–33 (2015).Google Scholar
Guo, J.T., Cui, C.Y., Chen, Y.X., Li, D.X., and Ye, H.Q.: Microstructure, interface and mechanical property of the DS NiAl/Cr(Mo,Hf) composite. Intermetallics 9, 287–297 (2001).Google Scholar
Cui, C.Y., Guo, J.T., Qi, Y.H., and Ye, H.Q.: High temperature embrittlement of NiAl alloy induced by hot isostatic pressing (HIPing) and aging. Scr. Mater. 44, 2437–2441 (2001).CrossRefGoogle Scholar
Cui, C.Y., Guo, J.T., Qi, Y.H., and Ye, H.Q.: Deformation behavior and microstructure of DS NiAl/Cr(Mo) alloy containing Hf. Intermetallics 10, 1001–1009 (2002).Google Scholar
Sheng, L.Y., Wang, L.J., Хi, T.F., Zheng, Y.F., and Ye, H.Q.: Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo,Hf) eutectic alloys. Mater. Des. 32, 4810–4817 (2011).CrossRefGoogle Scholar
Sheng, L.Y., Yang, F., Xi, T.F., Zheng, Y.F., and Guo, J.T.: Improvement of compressive strength and ductility in NiAl–Cr(Nb)/Dy alloy by rapid solidification and HIP treatment. Intermetallics 27, 14–20 (2012).Google Scholar
Sheng, L.Y., Zhang, W., Guo, J.T., Wang, Z.S., and Ye, H.Q.: Microstructure evolution and elevated temperature compressive properties of a rapidly solidified NiAl–Cr(Nb)/Dy alloy. Mater. Des. 30, 2752–2755 (2009).Google Scholar
Wang, L., Shen, J., Shang, Z., Zhang, J.F., Chen, J.H., and Fu, H.Z.: Effect of Dy on the microstructures of directionally solidified NiAl-Cr(Mo) hypereutectic alloy at different withdrawal rates. Intermetallics 44, 44–54 (2014).Google Scholar
Wang, L., Shen, J., Shang, Z., and Fu, H.Z.: Microstructure evolution and enhancement of fracture toughness of NiAl–Cr(Mo)–(Hf,Dy) alloy with a small addition of Fe during heat treatment. Scr. Mater. 89, 1–4 (2014).Google Scholar
Hunt, J.D. and Jackson, K.A.: The dendrite-eutectic transition. Trans. Metall. Soc. AIME 239, 864–867 (1967).Google Scholar
Raj, S.V., Locci, I.E., Salem, J.A., and Pawlik, R.J.: Effect of directionally solidified microstructures on the room-temperature fracture-toughness properties of Ni-33(at. pct)Al-33Cr-1Mo and Ni-33(at. pct)Al-31Cr-3Mo eutectic alloys grown at different solidification rates. Metall. Mater. Trans. A 33, 597–612 (2002).Google Scholar
Wang, L. and Shen, J.: Effect of heat treatment on the microstructure and elevated temperature tensile property of Fe-doped NiAl-Cr(Mo)-(Hf,Dy) eutectic alloy. Mater. Sci. Eng., A 654, 177–183 (2016).Google Scholar
Wang, L. and Shen, J.: Effect of withdrawal rate on the microstructure and room temperature mechanical properties of directionally solidified NiAl–Cr(Mo)–(Hf, Dy)–4Fe alloy. J. Alloys Compd. 663, 187–195 (2016).Google Scholar
Liang, Y.C., Guo, J.T., Xie, Y., Sheng, L.Y., Zhou, L.Z., and Hu, Z.Q.: Effect of growth rate on the tensile properties of DS NiAl/Cr(Mo) eutectic alloy produced by liquid metal cooling technique. Intermetallics 18, 319–323 (2010).Google Scholar
Stefanescu, D.M.: Science and Engineering of Casting Solidification, 2nd ed. (Springer, New York, 2009); p. 217.Google Scholar
Hu, G.X., Cai, X., and Rong, Y.H.: Fundamentals of Materials Science, 2nd ed. (Shanghai Jiao Tong University Press, Shang Hai, 2006); p. 293.Google Scholar