An experimental method of evaluating the fatigue behavior of alloys in different particle environments was designed, and the effects of four kinds of particles (i.e., graphite, CaO, Al₂O₃, and MnO₂) on the crack propagating behavior of 7N01-T6 behaviour alloys were investigated. The results show that the particles deposited on the crack surface exert significant influence on the fatigue crack propagation behavior thereof. This influence strongly depends on the elastic moduli of the particles (E_p). As E_p is less than that of aluminium alloy (E_Al), the particle accelerates the fatigue-crack-growth rate (FCGR) in the alloys due to the lubrication of the particles on the mating fracture surfaces. When the difference between E_p and E_Al is small, the particle effect on the FCGRs of the alloys is small due to the counteraction between the decrease in friction and the promotion on the crack closure of mating fracture surfaces. When E_p is greater than E_Al, the particles slow down the FCGRs of the alloys on account of significant crack closure effect. As E_p is much greater than E_Al, the particles increase the FCGRs because of the increasing stress concentration at the crack tip.

设计了一种评估合金在不同颗粒环境下疲劳行为的实验方法，并研究了四种颗粒（石墨，CaO，Al ₂ O ₃和MnO ₂）对7N01-T6裂纹扩展行为的影响。研究了行为合金。结果表明，沉积在裂纹表面上的颗粒对其疲劳裂纹扩展行为产生重大影响。这种影响在很大程度上取决于颗粒的弹性模量（E _p）。由于E _p小于铝合金（E _Al），由于在相配合的断裂表面上润滑了颗粒，因此颗粒加速了合金中的疲劳裂纹扩展速率（FCGR）。当E _p和E _Al之间的差异较小时，由于摩擦减小与配合断裂面的裂纹闭合促进之间的反作用，对合金FCGR的颗粒效应较小。当E _p大于E _Al时，由于明显的裂纹闭合效果，颗粒会减慢合金的FCGR。因为E _p比E _Al大得多，由于裂纹尖端处应力集中的增加，颗粒增加了FCGR。