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应用新型生产线固溶处理工艺对Cu-2.8N i-0.7S i-0.1Mg合金进行处理,研究了时效温度、时效时间和时效前不同变形量对Cu-2.8N i-0.7S i-0.1Mg合金微观组织和性能的影响。结果表明,合金在450℃时效时,第二相呈细小弥散状态分布在基体上,能获得较好的综合性能,在450℃时效4 h时,其导电率和显微硬度分别可达38.13%IACS和212.6 HV。经过对选区电子衍射花样的标定,析出相为N i2S i。合金经冷轧变形后内部出现大量的晶体缺陷,能在时效初期促进第二相的析出,使合金具有更好的综合性能,合金经60%变形后在450℃时效1 h后其导电率和显微硬度分别可达38.78%IACS和232.1 HV。继续升高时效温度或延长时效时间会引起第二相长大而导致显微硬度的升降。通过对生产线固溶和常规实验室固溶处理的合金进行性能比较,生产线固溶态合金的显微硬度时效后低于常规固溶处理合金,这可能是由生产线固溶时的不彻底性所导致。
The Cu-2.8N i-0.7S i-0.1Mg alloy was treated by a new production line solution treatment. The effect of aging temperature, aging time and different deformation before aging on Cu-2.8N i-0.7S i-0.1Mg alloy was studied. Effect of Alloy Microstructure and Properties. The results show that when the alloy is aged at 450 ℃, the second phase distributes in a finely dispersed state on the matrix, and good comprehensive properties can be obtained. At 450 ℃ for 4 h, the electrical conductivity and microhardness of the second phase are up to 38.13% IACS and 212.6 HV. After the election area electron diffraction pattern calibration, precipitation phase is N i2S i. After cold deformation, the alloy has a large number of internal crystal defects, which can promote the precipitation of the second phase at the initial stage of aging, resulting in a better overall performance of the alloy. After 60% deformation, the conductivity and Microhardness up to 38.78% IACS and 232.1 HV, respectively. Continue to raise the aging temperature or extend the aging time will cause the second phase grew up leading to micro-hardness rise and fall. By comparing the performance of the production line with that of the conventional laboratory solution treatment, the microhardness of the production line solid solution alloy is lower than that of the conventional solution treatment alloy after aging, which may be caused by the incompleteness of the production line resulting in.