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Effect of the initial ECAP passes on crystal texture and residual stresses of 5083 aluminum alloy
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-06-10 , DOI: 10.1007/s12613-020-2017-0
L. Romero-Reséndiz , A. Flores-Rivera , I. A. Figueroa , C. Braham , C. Reyes-Ruiz , I. Alfonso , G. González

To produce a highly refined microstructure, several metals or alloys have been processed via equal-channel angular pressing (ECAP). In this work, the mechanical and microstructural changes of the 5083 aluminum alloy in H11 condition after processed by two ECAP passes were investigated. An ECAP H13 steel die with an inner angle (α) of 120° and outer curvature (β) of 20° was used. The microstructural changes were associated with the loss of texture symmetry. The morphologies of the Mg2Si and α-Al(Mn,Fe)Si precipitates for the sample at the initial condition were similar to those subjected to two ECAP passes. The peak broadening measured by X-ray diffraction revealed an increment of both grain refinement and microstrain. After the second extrusion pass, the hardness increased by 62% compared with the initial condition. Moreover, the heterogeneous hardness behavior was compatible with a highly localized dislocation density. After two ECAP passes, shear parallel bands were observed to be at nearly 45° to the extrusion direction. The evaluation of first-order residual stress as a function of the depth of the analyzed sample displayed compressive or tensile values, depending on the measured face. With the plastic deformation applied, the first and second-order residual stresses exhibited significant increment. Williamson-Hall plots showed positive slopes, indicating an increment in the microstrain.



中文翻译:

ECAP初始通过对5083铝合金的晶体织构和残余应力的影响

为了产生高度精细的微观结构,已经通过等通道角压(ECAP)处理了几种金属或合金。在这项工作中,研究了在两次ECAP加工后在H11条件下5083铝合金的力学和显微组织变化。使用内角(α)为120°,外曲率(β)为20°的ECAP H13钢模具。微观结构的变化与纹理对称性的丧失有关。Mg 2的形态样品在初始条件下的Si和α-Al(Mn,Fe)Si沉淀与经过两次ECAP处理的沉淀相似。通过X射线衍射测量的峰展宽揭示了晶粒细化和微应变的增加。在第二次挤出后,硬度比初始条件提高了62%。此外,异质硬度行为与高度局部位错密度兼容。在经过两次ECAP之后,观察到平行于剪切方向成45°的剪切平行带。根据所测样品的深度,对一阶残余应力的评估显示出压缩或拉伸值,具体取决于被测面。通过施加塑性变形,一阶和二阶残余应力表现出显着的增加。

更新日期:2020-06-10
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