Thermomechanical and Precipitation Hardening of Stir-Cast Silica Reinforced Aluminium alloy Matrix Composites

Sharma , S S and Jagannath, K and Mohan, N S and Bhat, Chandrashekhar and Prabhu, P R and Chadaga, R C (2010) Thermomechanical and Precipitation Hardening of Stir-Cast Silica Reinforced Aluminium alloy Matrix Composites. World Journal of Engineering, 7 (3). pp. 1007-1008. ISSN 1708-5284

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Metal-matrix composites (MMC’s) are now attracting enormous interest. One of the prime reasons for this is that significant advances have been made in resent years on the development of fabrication routes, which are economically attractive and generate material of high micro structural quality (1). The properties of various aluminium alloys can be altered by precipitation hardening heat treatment. The precipitation hardening heat treatment can be classified into two processes, including solution heat treatment and artificial aging (2). By heating the solution treated material to a temperature above room temperature and holding it there, the precipitation of intermetallics accelerates and the strength is further increased. Thermomechanical treatment (TMT) consists of deforming the metal between the solution treatment and the aging treatment in thermomechanical processing of precipitation hardenable alloys. The effect of deformation on precipitation kinetics has often been attributed to an increase of dislocation density, which increases the nucleation sites, for phase transformation and provides easy diffusion paths for precipitation-forming elements in the material, leading to accelerated precipitation process as compared with the undeformed alloy (3). Therefore, the effect of deformation on the precipitation cannot be explained from dislocation density considerations alone. Thus segregation of the solute atoms to the potential nucleation sites may also contribute to precipitation kinetics and could provide an explanation for the observed acceleration of the precipitation process (4).

Item Type: Article
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 27 Feb 2013 07:33
Last Modified: 27 Feb 2013 07:33

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