The effect of matrix microstructure on cyclic response and fatigue behavior of particle- reinforced 2219 aluminum: Part I. room temperature behavior |
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Authors: | G M Vyletel J E Allison D C Van Aken |
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Affiliation: | (1) Advanced Vehicle Technologies, Ford Motor Company, 48121 Dearborn, MI;(2) Ford Research Laboratories, Ford Motor Company, 48121 Dearborn, MI;(3) Dept. of Metallurgical Engineering, University of Missouri-Rolla, 65401 Rolla, MO |
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Abstract: | The low-cycle and high-cycle fatigue behavior and cyclic response of naturally aged and overaged 2219/TiC/15p and unreinforced
2219 Al were investigated using plastic strain-controlled and stress-controlled testing. In addition, the influence of grain
size on the particle-reinforced materials was examined. In both reinforced and unreinforced materials, the naturally aged
conditions were cyclically unstable, exhibiting an initial hardening behavior followed by an extended region of cyclic stability
and ultimately a softening region. The overaged reinforced material was cyclically stable for the plastic strains examined,
while the overaged unreinforced material exhibited cyclic hardening at plastic strains greater than 2.5 × 10−4. Decreasing grain size of particle-reinforced materials modestly increased the cyclic flow stress of both naturally aged
and overaged materials. Reinforced and unreinforced materials exhibited similar fatigue life behaviors; however, the reinforced
and unreinforced naturally aged materials had superior fatigue lives in comparison to the overaged materials. Grain size had
no effect on the fatigue life behavior of the particle-reinforced materials. The fatigue lives were strongly influenced by
the presence of clusters of TiC particles and exogenous Al3Ti intermetallics.
formerly Research Assistant with the Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI
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This article is based on a presentation made in the symposium entitled “Creep and Fatigue in Metal Matrix Composites” at the
1994 TMS/ASM Spring meeting, held February 28–March 3, 1994 in San Francisco, California, under the auspices of the Joint
TMS-SMD/ASM-MSD Composite Materials Committee. |
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