The effects of cooling velocity on the multiaxial fatigue properties of A319 alloy under circular loading conditions was studied by using the MTS809 servo-hydraulic testing system and scanning electron microscopy.The results indicate that the solidification cooling velocity of 10 ℃·s~(-1)leads to decrease in the size of microstructures,such as second dendrite arming space,Si particle,and void compared.Hysteresis loops with smaller second dendrite arming space show that there is almost no phase angle between...
2)GM Global Powertrain Engineering,Pontiac MI 48340-2920铸造铝合金A319具有优异的可铸造性、良好的抗腐蚀能力、高的比强度等优点,通过合适的热处理工艺可以进一步提高其综合性能[1],因此被广泛应用于航天航空以及汽车制造领域.相关研究表明,有80%~95%的结构失效源于疲劳?
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