Cu-Ni-Co-Si合金在制备过程中织构的演变

Evolution of Texture of Cu-Ni-Co-Si Alloy During Preparation

通过EBSD研究了Cu-1.6Ni-1.2Co-0.65Si合金板材在生产制备过程中织构的演变。结果表明:该合金固溶态试样的织构成分主要是α纤维织构的Brass织构,Goss织构,S织构及少量Copper织构。固溶后直接时效处理不改变试样的织构种类,但会显著降低Brass织构的强度,略微增强Copper织构的强度。冷轧变形态试样随着冷轧变形量的增加,Brass织构会逐渐取代其他原始类型织构,整体织构极密度增大,该合金加工硬化对于硬度的提升与Brass织构极密度的增加呈正相关。500℃时效初期织构种类保持不变,织构整体极密度略微增大,随着时效时间的延长,整体织构的极密度逐渐下降,织构种类趋于分散。时效过程中织构极密度先增大后减小的趋势与硬度的变化规律相同;随着时效温度的增加,冷轧试样发生再结晶以及晶粒长大,Brass织构趋于分散,强度逐渐减弱,再结晶织构形成并逐渐集中,极密度强度逐渐增大。

Texture evolution of Cu-1.6Ni-1.2Co-0.65Si alloy sheet during the production process was studied by EBSD. The results show that the texture composition of the solid solution sample of the alloy is mainly the Brass texture of the α fiber texture,the Goss texture, the S texture and a small amount of Copper texture. The direct aging treatment after solution does not change the type of texture of sample, but it will significantly reduce the strength of the Brass texture and slightly increase the strength of the Copper texture. As the cold-rolled deformation increases, the Brass texture of the cold-rolled deformed sample will gradually replace other original textures. The texture pole density increases, and the increase in hardness of the alloy by work hardening is positively correlated with the increase in texture pole density. The texture type remains unchanged at the initial stage of aging at 500 ℃, and the overall texture pole density increases slightly as the aging time increases. Extending, the extreme density of the overall texture gradually decreases, and the texture types tend to be dispersed. During the aging process, the texture density first increases and then decreases, the same as the hardness change rule. With the increases of the aging temperature, the cold-rolled samples recrystallize and the grains grow, the Brass texture tends to disperse, the strength gradually weakens, the recrystallized texture forms and gradually concentrates, and the extreme density strength gradually increases.