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首页> 外文期刊>Materials Science and Engineering >Effect of constraint factor on the thermo-mechanical fatigue behavior of an Al-Si eutectic alloy
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Effect of constraint factor on the thermo-mechanical fatigue behavior of an Al-Si eutectic alloy

机译：约束因素对Al-Si共晶合金热机械疲劳行为的影响

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摘要

The thermo-mechanical fatigue (TMF) behaviors and corresponding damage mechanisms of Al-Si piston alloy were investigated in the temperature range of 120-425 ℃ under different constraint factors (η). The TMF hysteresis loops exhibit asymmetrical, because the yield strength and elastic modulus decrease significantly with the increasing temperature. Taking the phase angles into consideration, the mean tensile stress for out of phase TMF (OP-TMF, η ＜ 0) and mean compressive stress for in-phase TMF (IP-TMF, η ＞ 0) can be found. The fatigue life of IP-TMF is longer than that of OP-TMF except for higher constraint factor, and the life of TMF decreases with the increasing absolute value of η. There are two different crack initiation mechanisms under the constrain TMF: primary phases broken mainly for OP-TMF and matrix deboned mainly for IP-TMF. The oxidation may have only little influence on the crack behavior and TMF life, considering the obvious damage by deboned or broken primary phases. The tensile stress is key factor for fatigue crack initiation and growth in primary phases (Si and intermetallic) under cyclic deformation. The TMF life under different constrain factors can be predicted by the strain energy model with good precision.
机译：研究了Al-Si活塞合金在120-425℃温度范围内在不同约束因子（η）下的热机械疲劳行为及相应的损伤机理。 TMF磁滞回线显示为不对称，因为屈服强度和弹性模量随温度升高而显着降低。考虑相角，可以找到异相TMF的平均拉伸应力（OP-TMF，η＜0）和同相TMF的平均压缩应力（IP-TMF，η＞ 0）。 IP-TMF的疲劳寿命比OP-TMF更长，除了有更高的约束因子外，TMF的寿命随着η绝对值的增加而降低。在约束TMF下有两种不同的裂纹萌生机制：主要是为OP-TMF破坏的主要相和主要为IP-TMF去除粘结的基质。考虑到脱脂或破碎的初相会造成明显的损坏，氧化可能对裂纹行为和TMF寿命影响很小。张应力是周期性变形下疲劳裂纹萌生和初生相（硅和金属间化合物）生长的关键因素。通过应变能模型可以很好地预测不同约束条件下的TMF寿命。

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