Combined effect of heat treatment and rolling on pre-strained and SPDed aluminum sheet
Combined effect of heat treatment and rolling on pre-strained and SPDed aluminum sheet
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DOI：
10.1016/j.msea.2014.06.044
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发表时间：
2014-08
期刊：
影响因子：
6.4
通讯作者：
H. Pouraliakbar;S. Firooz;M. Jandaghi;G. Khalaj;Ameneh Amirafshar
中科院分区：
文献类型：
--
作者：
H. Pouraliakbar;S. Firooz;M. Jandaghi;G. Khalaj;Ameneh Amirafshar
预应变和严重变形铝合金 AA1350 的样本在其最终加工过程中经过 125、200 和 275 °C 的轧制和热处理。研究了轧制和后退火对机械性能和微观结构演变的综合影响。主要工作集中在承受双重应变路径的样本的延展性上。结果表明，在 200 °C 和再结晶开始之前，充分的退火可以有效增强延展性，而不会明显降低样品的强度。在微观结构演化过程中，在较低温度下没有观察到晶粒/微晶的快速生长；然而，275°C 下的处理通过等轴层状结构显着改变机械特性。根据检验得出的结论是，通过应变为1.16的约束沟槽压制进行预应变，然后施加轧制应变直至应变为1.23，导致铝具有极其有限的延展性和无微裂纹的超细微观结构。通过在 200°C 下退火，伸长率得到显着恢复（高达 4.6%），与未经热处理且严重变形的铝的延展性（约 1%）相比，这一点非常明显。
Specimens of pre-strained and severely deformed aluminum alloy AA1350 are undergone rolling and heat treatment at 125, 200 and 275 °C on their final processing history. The combined effect of rolling and post-annealing on the mechanical properties and microstructural evolutions is investigated. The main effort is focused on the ductility of specimens tolerating duplex straining paths. Results show that adequate annealing can effectively enhance ductility without noticeable decrease in the strength of the specimens at 200 °C and before recrystallization starts. During microstructural evolutions, no rapid grain/crystallite growth is observed at lower temperatures; however, treatment at 275 °C considerably changes mechanical characteristics by equiaxing the lamellar structure. According to the examinations, it is concluded that pre-straining through constrained groove pressing with the strain of 1.16 and subsequently imposing rolling strain up to the strain of 1.23 results in aluminum having extremely limited ductility and ultra-fine microstructure free of micro-cracks. By annealing at 200 °C, the considerable recovery of elongation (up to 4.6%) is achieved and this is noticeable compared to the ductility of non-heat treated and severely deformed aluminum (approximately 1%).