Improving the tensile ductility and uniform elongation of high-strength ultrafine-grained Al alloys by lowering the grain boundary misorientation angle
Improving the tensile ductility and uniform elongation of high-strength ultrafine-grained Al alloys by lowering the grain boundary misorientation angle
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DOI：
10.1016/j.scriptamat.2014.01.020
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发表时间：
2014-05
影响因子：
6
通讯作者：
T. Hu;Kaka Ma;T. Topping;Brandon D. Saller;A. Yousefiani;J. Schoenung;E. Lavernia
中科院分区：
文献类型：
--
作者：
T. Hu;Kaka Ma;T. Topping;Brandon D. Saller;A. Yousefiani;J. Schoenung;E. Lavernia
通过低温球磨和固结（热等静压），然后采用两阶段形变热处理方法（高温旋锻和室温高应变率挤压）制备了具有层状结构的高强度超细晶铝合金。每个片层带由多个超细晶粒组成，通过低取向差角晶界连接。这种结构允许位错滑过低取向差角晶界并在带内积累，提供高均匀伸长率同时保持高强度。
A high-strength, ultrafine-grained Al alloy with a lamellar structure was fabricated via cryomilling and consolidation (hot isostatic pressing), followed by a two-stage thermomechanical processing approach (e.g. high temperature rotary swaging and room temperature high strain rate extrusion). Each lamellar band consisted of multiple ultrafine grains connected by low misorientation angle grain boundaries. This structure allows the dislocations to glide through low misorientation angle grain boundaries and to accumulate within the band, providing a high uniform elongation while retaining high strength.