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采用TEM对Cu-0.22Cr-0.05Zr-0.05Sn合金不同形变热处理状态微观组织的演变以及时效过程中析出相的状态进行研究,并以此解释形变热处理过程中合金力学性能和导电性能的变化。结果表明,合金中存在2种析出相,分别是Cr相和Cu4Zr相。其中Cr相在时效过程中分别经历了固溶体、GP区、脱溶并与基体共格以及长大;而Cu4Zr相则以早期Cr析出相为核伴随析出,与基体半共格。由于析出相尺寸很小,且分布较为均匀,使合金具有很强的时效强化效果,经940℃固溶1h后冷加工至变形率为96%并在400℃时效4h,合金的抗拉强度和电导率可分别达到400MPa和84%IACS。对于该合金,时效温度是决定合金综合性能的关键,而时效时间对综合性能的影响并不显著。
The microstructure of the Cu-0.22Cr-0.05Zr-0.05Sn alloy under different deformation heat treatment conditions and the state of the precipitated phase during the aging process were studied by using TEM, and the changes of mechanical properties and electrical conductivity of the alloy during the deformation heat treatment were explained. The results show that there are two kinds of precipitates in the alloy, which are Cr phase and Cu4Zr phase respectively. The phase of Cr is undergone solid solution, GP zone, desolventize, and grow with the matrix during the aging process. However, the phase of Cu4Zr precipitates with the early Cr precipitation phase and is half-lattice with the matrix. Due to the small size and uniform distribution of the precipitated phase, the alloy has a strong aging strengthening effect. After being solid-solutioned at 940 ° C for 1h, the alloy is cold worked to a deformation rate of 96% and aged at 400 ° C for 4h. The tensile strength and electrical conductivity The rates can reach 400 MPa and 84% IACS, respectively. For the alloy, the aging temperature is the key to determine the overall performance of the alloy, and aging time on the overall performance is not significant.