Texture, microstructure and formability of SC and DC cast Al–Mg alloys
Texture, microstructure and formability of SC and DC cast Al–Mg alloys
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DOI：
10.1016/s0921-5093(01)01393-4
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发表时间：
2002-01
期刊：
影响因子：
6.4
通讯作者：
Xiang Cheng;J. Morris
中科院分区：
文献类型：
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作者：
Xiang Cheng;J. Morris
研究了直冷（DC）铸造和带坯铸造（SC）Al-Mg合金（AA 5754和AA 5182）的织构、显微组织和成形性，发现它们在很大程度上取决于生产工艺（DC与SC）和化学成分。DC热带通常完全再结晶，因此具有强的再结晶织构，而SC热带具有变形结构，因此具有强的变形织构。SC热轧带钢高温退火难以获得强的再结晶织构。然而，退火SC 5754热轧带比退火SC 5182热轧带具有更强的再结晶织构成分。这是由于退火过程中SC 5182热带中发生了较强的动态析出。结果，退火后的SC 5754热轧带具有小的90°制耳，而SC 5182热轧带在退火后具有90°制耳和45°制耳。具有变形结构的材料的交叉轧制导致最终冷轧样品中的显著织构变化，而具有再结晶结构的材料的交叉轧制不引起织构变化。与直轧相比，斜轧降低了变形织构组分（尤其是铜组分）的体积分数，而再结晶织构组分变化不大。铝镁合金强度大，加工困难。然而，在高温下退火后，可加工性可以显著改善。
Texture, microstructure and formability were studied in direct chill (DC) cast and strip cast (SC) Al–Mg alloys (AA5754 and AA5182) and were found to largely depend on the production processes (DC versus SC) and chemical compositions. DC hot bands are usually fully recrystallized and thus have strong recrystallization textures while SC hot bands have deformation structures and thus strong deformation textures. It is difficult to obtain strong recrystallization textures in SC hot band materials with elevated temperature annealing. However, annealed SC5754 hot bands have stronger recrystallization texture components than annealed SC5182 hot bands. This is due to the fact that a stronger dynamic precipitation occurs in SC5182 hot bands during annealing. As a result, annealed SC5754 hot bands have small 90° earing while SC5182 hot bands have both 90° earing and 45° earing after annealing. Cross rolling of materials with a deformation structure causes a significant texture change in the final cold rolled samples while it causes no texture change in materials with a recrystallized structure. Compared to samples after straight rolling, cross rolling reduces the volume fraction of the deformation texture components (especially the copper component) with little change in recrystallization texture components. Al–Mg alloys are strong and difficult to work. However, the workability can be significantly improved after annealing at an elevated temperature.