Age-hardening characteristics of aluminum alloy-hollow fly ash composites |
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| Authors: | P K Rohatgi M Gajdardziska-Josifovska D P Robertson J K Kim R Q Guo |
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| Affiliation: | (1) Present address: Materials Department, the University of Wisconsin-Milwaukee, 53211 Milwaukee, WI;(2) Department of Physics, the University of Wisconsin-Milwaukee, 53211 Milwaukee, WI;(3) MER Corporation, 85706 Tucson, AZ;(4) International Thermal System, 53214 Milwaukee, WI |
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| Abstract: | The aging characteristics of aluminum alloy A356 and an aluminum alloy A356 containing hollow spherical fly ash particles
were studied using optical microscopy, transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy,
hardness tests, and compressive tests. The variation of hardness and compressive strength as a function of aging time for
the composite have been reported. Since the density of the composite is lower than that of the base alloy due to the presence
of hollow particles, the composites have a higher specific strength and specific hardness compared to the matrix. Even though
the hardness of the as-cast composite was higher than that of the base alloy, no significant change in the aging kinetics
was observed, due to the presence of spherical fly ash particles in the matrix. Aging times of the order of 104 to 105 seconds were required to reach the peak hardness (92 HRF) and compressive strength (376 MPa) in both the A356-5 wt pct fly
ash composite and the matrix alloy. The possible effects of shape and hollowness of particles, the interface between the matrix
and the particles, the low modulus of the particles, and the microcracks formed on the surface of hollow fly ash particles
on the kinetics of the age hardening of aluminum alloy A356 are discussed. |
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