Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming
Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming
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累积连续挤压成形细晶Al-Mg合金的显微组织演变及强化机制
DOI：
10.1016/j.jmst.2022.03.032
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发表时间：
2022-05
影响因子：
10.9
通讯作者：
Renguo Guan
中科院分区：
文献类型：
--
作者：
Bowei Yang;Yu Wang;Minqiang Gao;Changfeng Wang;Renguo Guan
研究了累积连续挤压成形（ACEF）流变挤压5087合金的力学性能和组织演变强化机制。利用电子背散射衍射（EBSD）和透射电子显微镜（TEM）对不同道次交流电场作用下合金的微观组织进行了表征。讨论了连续动态再结晶（CDRX）对晶粒细化的作用。结果表明，经过3道次交流电场处理后，合金的晶粒得到明显细化，平均晶粒尺寸从45.6 μm减小到2.5 μm，抗拉强度和屈服强度分别提高到362.8 MPa和234.6 MPa。形变过程中产生的位错胞/壁促进了低角度晶界的形成。累积应变加速了LAGB向大角度晶界（HAGB）的转变。位错堆积增强了晶粒的CDRX驱动力，晶界处的纳米Al 6（Mn，Fe）相由于钉扎效应抑制了晶粒的生长。定量分析表明，位错强化和晶界强化是提高合金屈服强度的主要原因。
In this work, the mechanical properties and strengthening mechanisms induced by microstructural evolution in a rheo-extruded 5087 alloy processed via accumulative continuous extrusion forming (ACEF) were investigated. Electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) were utilized to characterize the microstructure of the alloy subjected to ACEF with various passes. The grain refinement caused by continuous dynamic recrystallization (CDRX) was discussed. The results demonstrated that after 3 passes of ACEF, there was a significant grain refinement effect on the alloy, and the average grain size decreased from 45.6 μm to 2.5 μm; the ultimate tensile strength (UTS) and yield strength (YS) of the alloy increased to 362.8 MPa and 234.6 MPa, respectively. Dislocation cells/walls generated during deformation promoted the formation of low angle grain boundaries (LAGBs). The accumulative strain accelerated the transformation of LAGBs to high angle grain boundaries (HAGBs). Dislocation pile-up enhanced the driving force of CDRX, and nano-sized Al6(Mn, Fe) phases at the grain boundaries inhibited the growth of grains due to the pinning effect. Based on the quantitative estimation, dislocation strengthening and grain boundary strengthening dominated the enhancement in YS of the ACEFed alloy.
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