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Study on Cast Ni3 Al-Base alloys

Published online by Cambridge University Press:  26 February 2011

Zhou Yizhang ,
Zhang Tianxiang ,
Tong Yingjie ,
Zhang Bingda ,
Zhu Yaoxiao  and
Hu Zhuangqi
Zhou Yizhang
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
Zhang Tianxiang
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
Tong Yingjie
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
Zhang Bingda
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
Zhu Yaoxiao
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
Hu Zhuangqi
Affiliation:
Institute of Metal Research, Academia Sinica, 2-6 Wenhua Road, Shenyang, P.R.China
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Abstract

A series of cast Ni3Al-base alloys with the addition of alloying elements, such as Hf, Zr, Ti, Nb etc., have been studied, in which the total amount of Al and alloying elements substituting for Al was controlled in the range of 18 to 23 at%. It was found the alloying elements change remarkably the morphology, distribution and amount of γ phase as well as the morphology and size of primary γ′ intermetallic compound. The size of primary γ′ can be decreased to micron order. The brittle γ′-γ′ boundary (refer to primary γ′) can be substituted by tough γ′-γ-γ′ boundary. As a result, the mechanical properties of the cast Ni3Al-base alloys, especially high temperature ductility, can be enhanced. In addition, the effect of Cr is discussed when tested in air environment, and considered that chromium addition is not very effective to improve the high temperature embrittlement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 555
Copyright
Copyright © Materials Research Society 1989

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References

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