退火温度对模压形变后冷轧Cu-35Zn合金热稳定性的影响

Effect of annealing temperature on thermal stability of Cu-35 Zn alloy processed by constrained groove pressing and cold rolling

对Cu-35Zn合金首先采用模压形变十道次后再进行30%冷轧,随后再进行不同温度的退火热处理,研究了经模压形变后冷轧的Cu-35Zn合金的热稳定性。结果表明:模压形变后冷轧可以细化Cu-35Zn合金的晶粒,并有效地提高其强度和硬度。经模压形变后冷轧的Cu-35Zn合金在200℃以下退火时,材料组织处于回复阶段;在220℃退火时,形成具有大角度晶界的亚晶;在300~400℃的温度范围内,完成再结晶及晶粒长大过程。

Cu-35Zn alloy deformed by constrained groove pressing( CGP) up to 10 passes and 30% cold rolling was annealed at different temperatures.The thermal stability of Cu-35Zn processed by CGP and cold rolling was studied.The results show that the grains of Cu-35Zn alloy are refined by CGP and cold rolling.After the deformation of CGP and cold rolling,the hardness and strength of the samples are improved.The recovery process of specimens deformed by CGP and cold rolling is dominants when annealing below 200 ℃.The crystallites with large angle grain boundary are formed at 220 ℃.The recrystallization and grain growth are completed at 300-400 ℃.