2012•Journal of Central South University(Science and Technology)Requires access
Effect of solution treatment on fatigue behavior of 2E12 aluminum alloy
Daoyuan Huang
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Abstract
The effects of solid solution treatment(493 ℃/20 min and 503 ℃/20 min) on fatigue fracture and room mechanical properties of 2E12 aluminum alloy were investigated.Observation of microstructure and fatigue fracture was presented by means of X-ray diffraction,scanning electron microscope(SEM) and metallographical analysis.The results show that increasing the heating temperature has no obvious effect on the tensile properties of 2E12 aluminum alloy.The number of residual phases(Al2Cu,Al2CuMg) decreases during solid solution treatment.For 493 ℃/20 min and 503 ℃/20 min solution treated alloys,both alloys have the similar mechanical properties,but the latter has a better fatigue life with 20% improvement.The residual phases are easily dehisced to form micro-cracks during the fatigue process,offering more pathes for macro-crack propagation to reduce the fatigue properties.