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Effect of Boron Content on Mechanical Properties of Monocrystalline Ni3Al

Published online by Cambridge University Press:  26 February 2011

Guo Jianting ,
Sun Chao ,
Li Hui ,
Zhang Zhiya ,
Tang Yajun  and
Hu Zhuangqi
Guo Jianting
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
Sun Chao
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
Li Hui
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
Zhang Zhiya
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
Tang Yajun
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
Hu Zhuangqi
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, China
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Abstract

The microstructure and the mechanical properties at room and high temperatures of monocrystalline Ni3Al containing 0, 0.52, 1.37, 2.22 and 3.00 at%B have been studied. The results show that the ultimate and yield strengths at 20°C and 800° C of monocrystalline Ni3Al obviously increase with the increase of B content, and reach maxima when B content is 1.37 and 0.52 at% respectively. With further increasing the B content to 2.22 at%, they slowly drop. The tensile ductilities at 20°C and 800°C of monocrystalline Ni3Al when the B content is 0 and 0.52 at% respectively are the best in five kinds of Ni3Al studied, then they continuously decrease with the increase of B content due to the precipitation of boride eutectic. The rupture life and elongation at 850°C and 100 MPa markedly drop as the B content is raised in the monocrystalline Ni3Al, but they are still higher by 1 to 2 orders of magnitude as compared with those of polycrystalline Ni3Al with the same compositions. When B content exceeds 1.37 at%, the eutectic structure of Ni20Al3B6 and Ni3Al is formed, which is enhanced by the B content and is harmful to the strength and the ductility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 655
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

(1) Aoki, K., Izumi, O., J. Jpn. Inst. Met. 43, 1190(1979).Google Scholar
(2) Liu, C.T., White, C.L., Horton, J.A., Acta Metall. 33, 213(1985).Google Scholar
(3) Guo, Jianting, Li, Hui, Sun, Chao, Zhu, Yaoxiao, Acta Metall. Sin. 25, 406(1989).Google Scholar
(4) Heredia, F.E., Pope, D.P., In Superalloy, edited by Duhl, D.N. etc. (A Publication of The MetallurgicalSociety, Pennsylvania, 1988), p.315.Google Scholar
(5) Oguia, T., Hanada, S., Masumoto, T., Izumi, O., Metall. Trans. 16A, 441(1985).Google Scholar
(6) Guo, Jianting, Li, Hui, Sun, Chao, Tang, Minghui, Zhu, Yaoxiao, Chinese J. Mech. Eng. 1991 (unpublished).Google Scholar