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Precipitation strengthening of stress-aged Al-Cu-Mg-Ag alloy single crystals

机译：沉淀强化应激老化的Al-Cu-Mg-Ag合金单晶

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摘要

Al-Cu-Mg-Ag single crystals with five different orientations were used to study the precipitation behavior during stress aging under a stress range from 0 to 150 MPa. TEM characterization of the aged samples indicated that three kinds of precipitates Ω, S and θ' formed, and the number density of S precipitates increased with the applied stress. The distribution of two Ω variants Ω_1/Ω_2 behaved preferentially oriented under higher applied stress and the anisotropic degree was various between 0.3 and 1.4, which depends on the plane orientation of single crystal. As the stress loading directions of single crystals with (6510), (313) and (212) plane orientations are more perpendicular to the dislocation slide planes {111}, the distribution of Ω_1/Ω_2 in these single crystals is more homogeneous with the number ratio between 1.0 and 1.2. Considering the coupling effects of crystallographic anisotropy, stress-oriented precipitates and stress induced dislocations on precipitates, the size and distribution of Ω, S and θ' were quantitatively counted and analyzed. The increments of precipitation strengthening were calculated and compared with the measured hardness results, indicating that the hardness of single crystal with (6510) orientation increase by most with 15 HV after stress aging. The trend of hardness changes with applied stress and plane orientations was well modeled in stress-aged Al-Cu-Mg-Ag single crystals.
机译：使用具有五种不同取向的Al-Cu-Mg-Ag单晶用于研究应力范围为0至150MPa的应力老化期间的沉淀行为。老化样品的TEM表征表明，形成了三种沉淀物ω，s和θ'，并且S沉淀的数量密度随着施加的应力而增加。在较高施加的应力下优先取向的两个ω变型ω_1/ω_2的分布优先取向，各向异性程度在0.3和1.4之间，这取决于单晶的平面取向。作为具有（6510）的单晶的应力加载方向，（313）和（212）平面取向更垂直于位错滑坡{111}，在这些单晶中的ω_1/ω_2的分布更加均匀比率在1.0和1.2之间。考虑到结晶各向异性的偶联效果，应应力取向沉淀物和应激诱导的沉淀物，ω，s和θ'的尺寸和分布量被定量计数和分析。计算沉淀强化的增量，并与测量的硬度结果进行比较，表明单晶与（6510）取向的硬度大多数在应激老化后的15 HV增加。用施加的应力和平面取向的硬度变化的趋势在压力老化的Al-Cu-Mg-Ag单晶中良好地建模。

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