강화기구 제어에 따른 석출경화형 Al 합금의 피로특성 변화 연구
Effects of the Strengthening Mechanism on Fatigue Properties of Precipitation-Hardened Al Alloy
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The effects of the strengthening mechanism on the fatigue properties of Al–Mg–Si alloy were investigated. Annealing was conducted to minimize the precipitation-hardening effects on Al–Mg–Si alloy, as it could be the most efficient method to stabilize the precipitates. Severe plastic deformation was adapted to obtain grain-refining and work-hardening effects after the annealing process. To evaluate the change in fatigue properties and to investigate the dominant strengthening mechanisms in the specimens, fatigue crack propagation and low-cycle fatigue tests were performed. The experimental results showed that the fatigue crack propagation rate of the annealed specimen was higher than those of other specimens that were grain-refined and precipitation-hardened. During the low-cycle fatigue test, the annealed specimen exhibited cyclic hardening and saturation behavior, whereas the grain-refined specimen exhibited saturation and softening behavior. The low-cycle fatigue life and characteristics of the hysteresis loops of the specimens were evaluated using various parameters. Precipitation-hardened specimens exhibited higher fatigue strength and ductility coefficients than those under other conditions.
Abstract
The effects of the strengthening mechanism on the fatigue properties of Al–Mg–Si alloy were investigated. Annealing was conducted to minimize the precipitation-hardening effects on Al–Mg–Si alloy, as it could be the most efficient method to stabilize the precipitates. Severe plastic deformation was adapted to obtain grain-refining and work-hardening effects after the annealing process. To evaluate the change in fatigue properties and to investigate the dominant strengthening mechanisms in the specimens, fatigue crack propagation and low-cycle fatigue tests were performed. The experimental results showed that the fatigue crack propagation rate of the annealed specimen was higher than those of other specimens that were grain-refined and precipitation-hardened. During the low-cycle fatigue test, the annealed specimen exhibited cyclic hardening and saturation behavior, whereas the grain-refined specimen exhibited saturation and softening behavior. The low-cycle fatigue life and characteristics of the hysteresis loops of the specimens were evaluated using various parameters. Precipitation-hardened specimens exhibited higher fatigue strength and ductility coefficients than those under other conditions.
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