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A Microstruciure Investigation on Rapidly Solidified Ni3Al Containing Boron

Published online by Cambridge University Press:  21 February 2011

K.M. Ciiang
Affiliation:
General Electric Corporate Research and Development, Schenectady, New York, 12301USA
S.C. Huang
Affiliation:
General Electric Corporate Research and Development, Schenectady, New York, 12301USA
A.I. Taub
Affiliation:
General Electric Corporate Research and Development, Schenectady, New York, 12301USA
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Abstract

A small amount of boron addition in rapidly solidified Ni3 Al has been found to yield remarkable improvements in bolh room-temperature strength and ductility. In this study, the microstructure of melt-spun Ni3Al ribbons with various boron modifications ranging from 0 to 6.0 at% was investigated in detail by using transmission electron microscopy. All alloy compositions studied reveal a completely ordered fcc L12 matrix phase, in which polygonized dislocation networks and subgrain boundaries are observed. The boron-free Ni3 Al contains a dispersion of an Al-rich martensitic phase consisting of alternate twins. The boron addition tends to suppress the formation of the martensitic phase, but excessive boron (≥ 2.0 at%) causes the precipitation of M23B6 type borides.

Type
Research Article
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

[1] Guard, R.W. and Westbrook, J.H., Trans. TMS-AIME, 215, 807 (1959).Google Scholar
[2] Thornton, P.H., Davies, R.G., and Johnston, T.L., Met. Trans., 1, 207 (1970).Google Scholar
[3] Rawlings, R.D. and Staton-Bevan, A.E., J. Mater. Sci., 10, 505 (1975).10.1007/BF00543696Google Scholar
[4] Aoki, K. and Izumi, O., Trans. JIM, 19, 203 (1978).10.2320/matertrans1960.19.203Google Scholar
[5] Huang, S.C., Chang, K.M., and Taub, A.I., Rapidly Solidified Ni3 Al Containing Boron, presented at 1983 TMS-AIME Fall Meeting, Philadelphia, PA, Oct. 1983.Google Scholar
[6] Huang, S.C. and Chang, K.M., J. Mater. Sci., in press.Google Scholar
[7] Taub, A.I., Huang, S.C., and Chang, K.M., Met. Trans., in press.Google Scholar
[8] Liu, C.T. and Koch, C.C. in: Technical Aspects of Critical Materials Used by the Steel Industry, Vol.IIB (Center for Materials Science, NBS, June 1983) pp. P42–1.Google Scholar
[9] Messmer, R.P. and Briant, C.L., Acta Met., 30, 457 (1982).10.1016/0001-6160(82)90226-7Google Scholar