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首页> 外文期刊>Materials Science and Engineering >Asymmetric cryorolling of AA6061 Al alloy: Strain distribution, texture and age hardening behavior
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Asymmetric cryorolling of AA6061 Al alloy: Strain distribution, texture and age hardening behavior

机译：AA6061铝合金的不对称冷轧：应变分布，织构和时效硬化行为

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摘要

Asymmetric rolling combines direct compression and shear strain imposed by working rolls with different diameters or different rotations speeds. Processing at cryogenic temperatures may partially suppress dynamic recovery mechanisms, modifying the work-hardening rate and increasing the amount of accumulated strain. In this work, samples of AA6061 Al alloy were processed by asymmetric and conventional rolling, at room and cryogenic temperatures. The effects of asymmetric cryorolling were analyzed in terms of strain distribution, grain refinement, hardness, tensile strength and crystallographic texture after post-deformation heat treatments. Artificial aging after conventional rolling at room temperature proved to be more effective in increasing hardness and tensile strength, while the same heat treatment after asymmetric rolling at cryogenic temperature increased uniform elongation and reduced texture intensity. This behavior was associated with recovery and recrystallization phenomena after aging, which cause small dislocation-free grains to be generated inside deformation bands. This was observed directly by TEM and indirectly by texture analysis.
机译：非对称轧制结合了具有不同直径或不同转速的工作辊所施加的直接压缩和剪切应变。在低温下加工可能会部分抑制动态恢复机制，从而改变加工硬化率并增加累积应变的量。在这项工作中，在室温和低温下，通过不对称和常规轧制对AA6061铝合金样品进行处理。在变形后热处理后，根据应变分布，晶粒细化，硬度，抗拉强度和晶体织构分析了不对称低温轧制的影响。实践证明，在室温下常规轧制后的人工时效在提高硬度和抗拉强度方面更为有效，而在低温下非对称轧制后进行的相同热处理可提高均匀伸长率并降低织构强度。该行为与时效后的恢复和再结晶现象有关，这会导致在变形带内生成小的无位错晶粒。这可以通过TEM直接观察到，也可以通过纹理分析间接观察到。

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