Hot Deformation Behavior of P/M Al6061-20% SiC Composite
In the present work, hot workability of particulate-reinforced Al6061-20%SiC composite produced by direct hot extrusion technique was studied. Uniaxial hot compression test at various temperatures and strain rates was used and the workability behavior was evaluated from the flow curves and the attendant microstructures. It was shown that the presence of SiC particles in the soft Al6061 matrix deteriorates the hot workability. Bulging of the specimens and flow lines were observed, which indicates the plastic instability during hot working. Microstructure of the composites after hot deformation was found to be heterogeneous, i.e. the reinforcement clusters were observed at the flow lines. The mechanism of deformation is determined to be controlled primarily by dynamic recrystallization.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
H. Asgharzadeh and A. Simchi, "Hot Deformation Behavior of P/M Al6061-20% SiC Composite", Materials Science Forum, Vols. 534-536, pp. 897-900, 2007