Shear banding and recrystallization texture development in a multilayered Al alloy sheet produced by accumulative roll bonding
Shear banding and recrystallization texture development in a multilayered Al alloy sheet produced by accumulative roll bonding
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DOI：
10.1016/j.actamat.2008.08.056
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发表时间：
2009
期刊：
影响因子：
9.4
通讯作者：
M. Z. Quadir;M. Ferry;O. Al-Buhamad;P. Munroe
中科院分区：
文献类型：
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作者：
M. Z. Quadir;M. Ferry;O. Al-Buhamad;P. Munroe
商业纯Al合金和Al-0.3wt.% Sc合金，后者在过饱和或人工时效条件下，被累积辊压键合，以产生0.5 mm厚的板，由多个交替层的Al和Al（Sc）。这两种组合的变形机制强烈影响相邻层的相对硬化行为。对于Al/Al（Sc）时效材料，在层间界面处存在较大的面内剪切应力，远远超过Al（Sc）的流动应力。这导致了RD-ND截面中的层的全厚度剪切带和显著曲率。剪切带还导致轧制织构组分的强度降低，并对Al层的再结晶织构具有随机化作用。在这两种条件下，Al（Sc）层在350°C下延伸退火后均抵抗再结晶，并产生直径为0.5-0.8μm的回复等轴晶粒的显微组织。
A commercial purity Al alloy and an Al–0.3wt.% Sc alloy, the latter in either the supersaturated or artificially aged condition, were accumulative roll bonded to produce 0.5-mm-thick sheet consisting of multiple alternating layers of Al and Al(Sc). The deformation mechanism of these two combinations was strongly influenced by the relative hardening behaviour of the adjacent layers. For the Al/Al(Sc)agedmaterial, a higher magnitude of in-plane shear stress, well exceeding the flow stress of Al(Sc), was operative at the interface between layers. This resulted in through-thickness shear banding and a marked curvature of the layers in the RD–ND sections. Shear banding also resulted in a reduction in intensity of the rolling texture components and had a randomizing effect on the recrystallization texture of the Al layers. In both conditions, the Al(Sc) layers were resistant to recrystallization after extended annealing at 350°C and produced a microstructure of recovered equiaxed grains ∼0.5–0.8μm in diameter.