轧制及后续热处理对5052铝合金拉伸性能与晶体取向的影响

Effect of Rolling and Subsequent Heat Treatment on Tensile Property and Crystal Orientation of 5052 Al Alloy

采用轧制技术对退火态5052铝合金进行大应变加工,并进行后续200℃/1 h、350℃/1 h、500℃/1 h的热处理,研究了轧制及热处理对5052铝合金的硬度、拉伸性能和晶体取向的影响。结果表明,轧制可以有效提高5052铝合金的硬度与屈服强度。由于材料在244.8℃时再结晶,350℃/1 h和500℃/1 h的后续热处理使5052铝合金的硬度和拉伸性能持续下降。XRD分析得出轧制及后续热处理未能有效调控合金的晶体取向。基于Taylor公式的定量计算说明,轧制变形过程中所引入的位错只是5052铝合金强度提升的因素之一。

Hardness, tensile property and crystal orientation of 5052 A1 alloy after rolling process and different subsequent heat treatments （200℃/I h, 350 ℃/I h, 500 ℃/I h, respectively） were studied. The study indicates that the hardness and the yield strength of commercial purity aluminium can be effectively improved by rolling process. As the material recrystallization occurs at 244.8 ℃, the subsequent heat treatments of 350 ℃/1 h and 500 ℃/1 h will make the hardness and the tensile property of 5052 AI alloy continue to drop. The results of analysis based on XRD show that crystal orientation has little improvement by rolling process and its subsequent heat treatment. Quantitative calculation based Taylor＇s formula shows that the dislocation of 5052 A1 alloy strength enhancing. introduced by rolling deformation process is one of the factors