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The Effects of La on Rapidly Solidified Al – 66 at.% NI

Published online by Cambridge University Press:  16 February 2011

Baode Sun ,
Yaohe Zhou ,
Hul Lin  and
Dongllang Lin
Baode Sun
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Yaohe Zhou
Affiliation:
Department of Materials Science and Engineering, Northwestern Polytechnic University, Xi'an 710072, P. R. China
Hul Lin
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
Dongllang Lin
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
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Abstract

This paper investigates the microstructure and ductility of Al - 66 at.% Ni by means of melt spinning technology combined with La microalloying. It shows that the Al - 66 at.% Ni without La exhibits coarse equiaxed martensite grains with Ni3Al precipitating at the grain boundaries (GBs). An addition of 0.05 wt.% La suppresses the precipitation of Ni3Al and a microstructure of complete martensite is obtained. When the amount of La is 0.2∼0.8 wt.%, a “supersaturated” single phase of B2 structure NiAl results. The elongation of Al - 66 at.% Ni without La is only 0.8%. When 0.05, 0.2, and 0.8 (wt.%) La are added to the alloy, their elongations can be as high as 2.6, 3.0, and 3.2% respectively. This shows that the elongation increases with increasing La content. The microstructural morphology and the ductility enhancement mechanism are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 479
Copyright
Copyright © Materials Research Society 1995

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