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利用单晶研究了Al-Cu合金在弹性应力、屈服应力及塑性变形应力等加载条件下的应力时效行为,并分别通过透射电子显微镜(TEM)和压缩试验研究了应力时效后的显微组织与屈服强度。结果表明:15 MPa的弹性应力就足够影响Al-Cu合金单晶在180°C时效过程中θ′相的析出分布。沿着[16]_(Al)方向加载的应力会增加Al-Cu合金单晶(001)_(Al)惯析面上θ′相的析出密度。随着外加应力的增大,(001)_(Al)惯析面上θ′相的析出密度则会随之增加,进而导致Al-Cu合金单晶的屈服强度降低。通过应力产生的位错的影响及θ′相与Al基体之间的错配度作用的影响两个方面对应力时效时析出相择优分布的产生进行了讨论,结果更加符合θ′相与Al基体之间错配度作用的影响。
The stress aging behavior of Al-Cu alloy under the loading conditions of elastic stress, yield stress and plastic deformation stress was studied by single crystal. The microstructure and mechanical properties of Al-Cu alloy after stress aging were studied by transmission electron microscopy (TEM) Yield Strength. The results show that the elastic stress of 15 MPa is enough to affect the precipitation distribution of θ ’phase in Al-Cu alloy single crystal at 180 ° C. The stress applied in [16] _ (Al) direction will increase the precipitation density of θ ’phase on the (001) _ (Al) inertial surface of Al-Cu alloy. With the increase of applied stress, the precipitation density of θ ’phase on the (001) _ (Al) inertial surface increases with the increase of the applied stress, which leads to the decrease of the yield strength of Al-Cu alloy single crystal. The influence of dislocation caused by stress and the influence of the mismatch between θ ’phase and Al matrix are discussed. The results show that the phase distribution is more in line with that of Al matrix The effect of mismatch between the role.