Fabrication of aluminum-alumina/magnesia/particulate composites in foundries using magnesium additions to the melts

Pai, BC and Ray, S and Prabhakar, KV and Rohatgi, PK (1976) Fabrication of aluminum-alumina/magnesia/particulate composites in foundries using magnesium additions to the melts. Materials Science and Engineering, 24 . pp. 31-44.

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Abstract

A method is proposed for dispersing alumina particles in aluminum-base alloy castings using magnesium additions to the melt prior to the introduction of alumina particles. The recovery of alumina particles in the castings is studied as a function of the method and the amount of magnesium additions to the melt, the mode of stirring alumina particles in the melt, the presence of certain other elements in the melt, and the time elapsed between the fresh magnesium addition and the addition of alumina particles. It is shown that 80-micron alpha alumina particles can be stirred and retained by aluminum-base alloy melts to which 2.5-14.5 wt % magnesium has been alloyed or freshly added. Considerably higher percentages of alumina are retained in the castings when magnesium is freshly added to the melts and when mechanical stirring is used. The presence of alumina particles in Al-Mg alloy castings substantially refines their structure and increases their room temperature and high temperature hardness and elastic moduli.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science Ltd.
Uncontrolled Keywords: Aluminum alloys;Aluminum oxides;Magnesium oxides;Metal matrix composites;Production engineering;Additives;Cast alloys;Mechanical properties;Melting points;Microstructure; Modulus of elasticity;Temperature effects
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: M/S ICAST NAL
Date Deposited: 12 Jan 2007
Last Modified: 24 May 2010 09:54
URI: http://nal-ir.nal.res.in/id/eprint/3841

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