Multi-scale iron-rich phases induce fine microstructures in Al-Zn-Mg-Cu-Fe alloys
Multi-scale iron-rich phases induce fine microstructures in Al-Zn-Mg-Cu-Fe alloys
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DOI：
10.1080/14786435.2021.1916114
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发表时间：
2021-06
影响因子：
1.6
通讯作者：
L. Yuan;M. Guo;K. Yu;Ji-shan Zhang;L. Zhuang
中科院分区：
文献类型：
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作者：
L. Yuan;M. Guo;K. Yu;Ji-shan Zhang;L. Zhuang
Al-Zn-Mg-Cu-Fe合金经热处理后形成多尺度Al7Cu2Fe和AlFeCu相。这些多尺度颗粒显著影响再结晶晶粒的尺寸、形貌和取向及其相应的力学性能。随着富铁相颗粒浓度的增加，合金的晶粒尺寸从29.3 μm （0.0Fe wt.%）显著减小到19.9 μm （0.2Fe wt.%）和17.5 μm （0.4Fe wt.%）。在2号合金中，铜、cuend和Q的体积分数均降低，R、黄铜和P织构的体积分数较高。合金的屈服强度和极限抗拉强度随富铁相浓度的增加而降低。2号合金由于多尺度富铁相改善了组织和织构分布，r值最高，为0.698。最后介绍了合金中富铁相演化、再结晶和高成形性的机理。
ABSTRACT Multi-scale Al7Cu2Fe and AlFeCu phases are formed in Al-Zn-Mg-Cu-Fe alloys after thermomechanical processing. These multi-scale particles significantly affect the size, morphology, and orientation of recrystallised grains and their corresponding mechanical properties. With increasing concentrations of iron-rich phase particles, the grain size in alloys is significantly reduced from 29.3 μm (0.0Fe wt.%) to 19.9 μm (0.2Fe wt.%) and 17.5 μm (0.4Fe wt.%). The volume fractions of copper, CubeND, and Q all decrease, and the R, Brass, and P textures form with high volume fractions in the #2 alloy. Both the yield and ultimate tensile strengths of the alloys decrease with an increasing iron-rich phase concentration. The highest r value (0.698) is obtained in the #2 alloy due to the improved microstructure and texture distributions from multi-scale iron-rich phases. Finally, the mechanisms of the iron-rich phase evolution, recrystallisation, and high formability in the alloys are introduced.