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Practical Design of Ni3Al with High Hot Workability

Published online by Cambridge University Press:  15 February 2011

Yinmin Wang ,
Dongliang Lin  and
Yun Zhang
Yinmin Wang
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Dongliang Lin
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Yun Zhang
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
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Abstract

From our previous work, Ni3Al polycrystals with combined addition of magnesium and silicon kept high values of compressive strain at rupture (CSR) when the strain rate rose. In order to further improve hot workability of Ni3Al, 7.9wt.% Cr was added. The compressive tests showed that 30%∼40% CSR values of the alloy had been kept in a wide temperature range of 1173K-1373K at strain rates of 10-2sec-1 and 10-2sec-1 in contrast with 15%∼25% CSR values of the alloy without Cr addition.

In practical hot rolling process, at initial deformation temperature of 1373K, strain rate of 1.0 sec-1 and by controlling reduction within 10∼15% each rolling pass, Ni3Al ingots were successfully hot-rolled into polycrystals with different deformations, the maximum of which was 55%. The deformed alloys had manifestly enhanced mechanical properties shown by tensile tests.

The dislocation configurations of deformed alloys have been investigated by using transmission electron microscope(TEM).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 517
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

(1). Wang, Yinmin, Lin, Dongliang and Zhang, Yun, to be presented at 1996 MRS Fall Meeting, Syposium Z, Boston, MA, U.S.A, December 2–6, 1996.Google Scholar
(2). Guo, Jianting, Li, Hui, Sun, Chao, Zhu, Yaoxiao, Acta Metall. Sinica Series A Vol. 3 No. 3 pp 170–176, May 1990.Google Scholar
(3). Liu, C.T., Sikka, V.K-, J Met., 1986; 38(5): 19.Google Scholar