高压时效处理对Cu-51.15W-0.24Cr合金组织和性能的影响

Effect of High-Pressure Aging Treatment on Microstructure and Properties of Cu-51.15W-0.24Cr Alloy

摘要:

针对Cu-W合金的强度和导热导电性偏低问题，对Cu48.61W51.15Cr0.24合金进行了高压时效处理，并对比了高压时效处理和常压时效处理后合金的微观组织，硬度，热导率以及导电率。结果表明：高压时效处理能增大Cu48.61W51.15Cr0.24合金的致密度，使组织中析出的Cr相更加弥散细小，改善合金的硬度及导热导电性能。该合金经960 ℃/1 h固溶后，再在3 GPa压力下500 ℃时效1 h处理可获得较高的硬度、热扩散系数及较低的电阻率，其值分别为1540 MPa、0.5236 cm²·s^-1和4.458×10^-8 Ω·m，较相同工艺常压时效处理后的硬度和热扩散系数分别增加了17.56%和10.74%，而电阻率却降低了4.85%。因此，高压时效处理是提高Cu-51.15W-0.24Cr合金力学性能、降低电阻率的有效途径。

Abstract:

Aiming at solving the problem of poor strength, low conductivity and thermal conductivity of Cu-W alloys, high pressure aging treatment was conducted to reinforce Cu-51.15W-0.24Cr alloy. The microstructure, hardness, thermal conductivity and conductivity of the alloy after high pressure aging treatment and normal pressure aging treatment were compared. The results show that high pressure aging treatment can increase the compactness of Cu48.61W51.15Cr0.24 alloy, eventually resulting in more dispersed distribution and finer grain size of Cr phase during the aging treatment, and improving the hardness and thermal conductivity of the alloy. After solution treatment at 960 °C for 1 h and aging at 500 °C for 1 h under a pressure of 3 GPa, the hardness, thermal diffusivity and resistivity are determined to be 1540 MPa, 0.5236 cm²·s^-1 and 4.458×10^-8 Ω·m, respectively, which are 17.56% and 10.74% higher than and 4.85% lower than those of alloy under normal pressure, respectively. Therefore, high pressure aging treatment can be an effective way to improve mechanical properties and to reduce resistivity of Cu-51.15W-0.24Cr alloy.