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Processing, microstructure and mechanical properties of Al-based metal matrix composites reinforced with mechanically alloyed particles

Published online by Cambridge University Press:  19 April 2016

A.K. Chaubey ,
S. Scudino ,
N.K. Mukhopadhyay  and
J. Eckert
A.K. Chaubey*
Affiliation:
Institute of Minerals and Materials Technology (IMMT), Bhubaneswar-751013, India
S. Scudino
Affiliation:
IFW Dresden, Institut für Komplexe Materialien, Postfach 270116, D-01171 Dresden, Germany
N.K. Mukhopadhyay
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi-221005, India
J. Eckert
Affiliation:
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria; and Department Materials Physics, Montanuniversität Leoben, A-8700 Leoben, Austria
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Al-based composites reinforced with Mg–7.4%Al mechanically alloyed particles have been synthesized by hot pressing followed by hot extrusion. Microstructural characterization of the bulk samples reveals the phase transformation of the reinforced particles (Mg(Al)ss + γ-Al12Mg17) to the stable intermetallic β-Al3Mg2 phase which occurs during consolidation. The phase transformation leads to the increase of effective volume faction of the reinforcement along with strong interfacial bonding, which causes a significant increase of the strength of the composites retaining appreciable plastic deformation. The strengthening can be attributed to the reduction of ligament size and to the interface strengthening due to better interface bonding (load-transfer) between the Al-matrix and the reinforcing particles.

Keywords

compositepowder metallurgyscanning electron microscopy
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1229 - 1236
Copyright
Copyright © Materials Research Society 2016 

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References

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