Study on Thermo-mechanical Fatigue Behavior of E319 Cast Aluminum Alloy
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摘要: 对E319铸铝合金进行了等温疲劳及热机械疲劳试验研究，并对E319铸铝合金断口进行扫描电镜（SEM）分析。结果表明：热机械疲劳时E319铸铝合金的平均应力呈压应力。等温疲劳时断口为微孔聚集型断裂，热机械疲劳时断口表现为准解理断裂，热机械疲劳寿命远低于等温疲劳寿命。与镍基高温合金、钛铝合金相比，E319铸铝合金表现出不同的热机械疲劳循环应力应变特性和循环应力响应特性，由于温度和应力松弛的影响，迟滞回线的两端出现"弯勾"形状，并且在断裂前出现强烈的循环硬化行为。Abstract: The isothermal fatigue(IF) and thermo-mechanical fatigue(TMF) behaviors of E319 cast aluminum alloy were studied via experiment and scanning electron microscope(SEM). The results showed that by comparing with Nickel-based superalloy and Ti-Al alloy, E319 cast aluminum alloy exhibits unique TMF cyclic stress-strain characteristics and cyclic stress response. Due to the influence of the temperature and stress relaxation, the hysteresis loop has a curved hook shape, and the specimen has a strong cyclic hardening behavior before the fracture. The mean stress is negative. IF and TMF fracture surface is different, in which the two fracture surfaces have different crack growth mechanism and fracture mode, the TMF life is far lower than the IF life.
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表 1 E319铸铝合金的化学成分
wt% 成分 Si Cu Mg Fe Mn Sr Ti Al 含量 7.35 3.32 0.22 0.78 0.24 0.03 0.13 Rest 
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表 2 等温疲劳试验结果
频率/Hz 应变比 温度/℃ 应变幅/% 寿命 σmax/MPa σmin/MPa σm/MPa 0.1 -1 100 0.3 2 624 175.279 -174.756 0.523 250 2 031 176.028 -173.601 2.427
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表 3 热机械疲劳试验结果
周期/s 相位 试件编号 机械应变幅/% 寿命 σmax/MPa σmin/MPa σm/MPa 240 同相位 1 0.3 288 104.161 -154.116 -24.998
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