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研究了Cu-3.2Ni-0.75Si-0.3Zn合金时效前固溶温度和时间对该合金硬度及电导率的影响,并且分析了不同固溶条件之后时效对Cu-3.2Ni-0.75Si-0.3Zn合金性能的影响。结果表明:时效前固溶温度的升高,材料的电导率先较快下降,之后又回升,而硬度呈下降的趋势,当固溶温度到达925℃时,硬度下降缓慢;随着固溶温度的增加,其再结晶程度越来越高,到900℃时组织已是完全再结晶组织,温度继续升高,晶粒会发生长大;通过扫描电镜及能谱分析仪观察900℃固溶后的试样,发现只有少量析出相存在。而相对于固溶温度,固溶时间对合金性能的影响不明显。在不同固溶制度下,合金试样经冷变形和时效后,其电导率随固溶温度的升高先降后升,而抗拉强度和延伸率随固溶温度的升高会先升高后下降,固溶温度为925℃时试样的抗拉强度到达峰值,延伸率则在850℃时达到峰值。与其他固溶处理制度相比,合金在900℃×60 min固溶处理,经60%的冷变形,450℃×4 h时效处理后,可得到较好的综合性能。此时,合金抗拉强度达到762 MPa,延伸率为6.1%,电导率为32.5%IACS。
The effect of solution temperature and time on the hardness and electrical conductivity of Cu-3.2Ni-0.75Si-0.3Zn alloy was studied. The effect of aging treatment on Cu-3.2Ni-0.75Si-0.3Zn Effect of alloy properties. The results show that when the solution temperature increases before aging, the electrical conductivity of the material first decreases rapidly and then increases, while the hardness decreases. When the solution temperature reaches 925 ℃, the hardness decreases slowly. With the increase of solution temperature The degree of recrystallization is higher and higher. When the temperature is 900 ℃, the microstructure is completely recrystallized and the temperature will continue to rise, and the grains will grow up. The microstructure of the microstructure after 900 ℃ solid solution is observed by SEM and EDS The sample was found to contain only a small amount of precipitates. Compared with the solution temperature, the effect of solution time on the properties of the alloy is not obvious. Under different solution conditions, the electrical conductivity of the alloy samples first decreased and then increased with the increase of solution temperature after cold deformation and aging, while the tensile strength and elongation increased first with the increase of solution temperature After dropping, the tensile strength of the sample reaches its peak at 925 ℃ and the elongation reaches its peak at 850 ℃. Compared with other solution treatment systems, the alloy obtained good comprehensive properties after solution treatment at 900 ℃ for 60 min, 60% cold deformation and 450 ℃ × 4 h aging treatment. At this point, the tensile strength of the alloy reaches 762 MPa, the elongation is 6.1% and the conductivity is 32.5% IACS.