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Chill-zone aluminum alloys with GPa strength and good plasticity

Published online by Cambridge University Press:  31 January 2011

Yan Li ,
Konstantinos Georgarakis ,
Shujie Pang ,
Frédéric Charlot ,
Alain LeMoulec ,
Sandrine Brice-Profeta ,
Tao Zhang  and
Alain Reza Yavari
Yan Li
Affiliation:
Department of Materials Science and Engineering, Beihang University, Beijing 100083, China; and Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
Konstantinos Georgarakis
Affiliation:
Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
Shujie Pang
Affiliation:
Department of Materials Science and Engineering, Beihang University, Beijing 100083, China
Frédéric Charlot
Affiliation:
Department of Materials Science and Engineering, Beihang University, Beijing 100083, China; and Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
Alain LeMoulec
Affiliation:
Department of Materials Science and Engineering, Beihang University, Beijing 100083, China; and Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
Sandrine Brice-Profeta
Affiliation:
Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
Tao Zhang
Affiliation:
Department of Materials Science and Engineering, Beihang University, Beijing 100083, China
Alain Reza Yavari*
Affiliation:
Euronano, SIMaP-LTPCM, Institut Polytechnique de Grenoble INPG, Saint-Martin-d’Heres Campus, Grenoble 38402, France
*
a) Address all correspondence to this author. e-mail: yavari@ltpcm.inpg.fr
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Abstract

Using a cold graphite mold casting method, bulk AlNiY chill-zone alloys were prepared at hypereutectic compositions with Al content from 85 at.% to 94 at.%. It was found that ultra-hard surface layers with a thickness of about 200 μm and submicron grain size form when the melt can be undercooled without heterogeneous nucleation at the mold contact surface. This hard chill-zone forming in contact with the mold possesses Vickers microhardness Hv about 350–420 and is thus harder than fully amorphous Al alloys. In compression, ultimate strength more than 1.1 GPa and true strain more than 150% without failure were achieved simultaneously. The combination of high strength and good plasticity will be discussed in relation to the special structure of the chill-zone alloy.

Keywords

AlAmorphousGrain size
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1513 - 1521
Copyright
Copyright © Materials Research Society 2009

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