Affiliation:
1. Pusan National University
2. National Institute of Advanced Industrial Science and Technology (AIST)
Abstract
The nano/microstructure and mechanical/tribological properties of the eutectic regions in
thixo/rheo-cast A356 alloy parts were investigated using nano/micro-indentation and mechanical
scratching, combined with optical microscopy and atomic force microscopy (AFM). Most eutectic
silicon crystals in the A356 alloy showed a modified morphology as fine-fibers. The aging
responses of the eutectic regions in both the thixo/rheo cast A356 alloys aged at 150 0C for different
times (0, 2, 4, 8, 10, 16, 24, 36, and 72h) were investigated. Both Vickers hardness (HV) and
indentation hardness (HIT) test results showed almost the same trend of aging curves, the peak was
obtained at the same aging time of 10 h, and in tribological properties of thixo/rheo-cast, the friction
coefficient of thixo-cast was investigated lower than that of rheo-cast.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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