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首页> 外文期刊>Materials Science and Engineering >Bendability enhancement of an age-hardenable aluminum alloy: Part Ⅰ - relationship between microstructure, plastic deformation and fracture
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Bendability enhancement of an age-hardenable aluminum alloy: Part Ⅰ - relationship between microstructure, plastic deformation and fracture

机译：时效硬化铝合金的弯曲性能增强：第一部分-微观组织，塑性变形和断裂之间的关系

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摘要

In this study, the bendability of two 1 mm thick sheets of monolithic AA6016 and composite AA6016X alloys is investigated using a series of wrap-bend tests, with emphasis on understanding the relationship between microstructure, the nature of plastic deformation and fracture behavior. The composite AA6016X alloy consists of a central core of AA6016 sandwiched between 100 pm thick clad layers of AA8xxx series aluminum alloy, processed using thermomechanical roll-bonding. It is shown that the bendability of monolithic AA6016 alloy is limited due to the formation of severe surface undulations and surface cracking, which is associated with the heterogenous nature of slip that concentrates into 5 degrees-15 degrees misoriented coarse slip bands of very high dislocation content in the order of 10(14)/m(2), and intense shear bands originating from surface low cusps in the form of mutually orthogonal transgranular bands. The micro-cracks initiate at the surface and propagate along these intensely sheared regions, primarily consisting of grains with near S texture component. Grain boundary de cohesion occurs along boundaries that are highly misoriented with misorientations ranging from 40 degrees up to as high as 60 degrees, further assisting crack propagation. The composite AA6016X alloy exhibits unlimited bendability with no signs of fracture even after a maximum bend angle of 180 degrees. The extremely high bending strains in AA6016X are accommodated in a homogeneous manner through a grain subdivision process within the AA8xxx clad layers, promoting the formation of deformation induced high angle boundaries. This homogeneous accommodation of strain within the clad layers reduces surface roughness and further enhances the bendability of the alloy.
机译：在这项研究中，使用一系列绕弯试验研究了两块1 mm厚的整体式AA6016和复合AA6016X合金的可弯曲性，重点是了解微观结构，塑性变形的性质和断裂行为之间的关系。复合材料AA6016X合金由AA6016的中心芯组成，该芯夹在100 pm厚的AA8xxx系列铝合金包覆层之间，并采用热机械轧制工艺加工。结果表明，由于严重的表面起伏和表面裂纹的形成，整体式AA6016合金的弯曲能力受到限制，这与滑移的异质性有关，滑移的非均质性集中到位错含量非常高的5度至15度错向的粗滑带中剪切带的数量级为10（14）/ m（2），并且强烈的剪切带以相互正交的跨晶带的形式起源于表面低尖点。微裂纹在表面开始并沿着这些强烈剪切的区域传播，这些区域主要由具有接近S织构成分的晶粒组成。晶粒边界的脱粘现象发生在高度错位的边界上，其错位范围从40度到高达60度，进一步有助于裂纹扩展。复合材料AA6016X合金即使在最大180度弯曲角度后仍具有无限的可弯曲性，没有破裂迹象。 AA6016X中极高的弯曲应变通过晶粒细分过程以均匀的方式容纳在AA8xxx覆层中，从而促进了变形引起的高角度边界的形成。包层内应变的这种均匀适应降低了表面粗糙度，并进一步增强了合金的可弯曲性。

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