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Al2O3颗粒弥散强化铜基复合材料因具有高强度和高导电性而在电子行业和电阻焊行业有着广阔的应用前景,本文利用扫描电子显微镜和透射电子显微镜对内氧化法制备的Al2O3/Cu复合材料的显微组织进行了分析,并用高温电子拉伸试验机测试了其高温拉伸力学性能。结果表明,Cu 0.6%Al2O3复合材料的室温拉伸屈服强度为442MPa,600℃时屈服强度为154MPa;试验温度低于300℃,其断面收缩率为22.2%～62.0%,温度高于400℃,其断面收缩率为4.5%～9.1%,呈现出明显的高温脆性。对其拉伸断口形貌和断裂机理进行了初步分析。
Al2O3 particle dispersion strengthened Cu-based composites have broad application prospects in the electronics industry and resistance welding industry because of their high strength and high electrical conductivity. In this paper, Al2O3 / Cu composites prepared by the internal oxidation method were characterized by scanning electron microscopy (SEM) and transmission electron microscopy The microstructures were analyzed and their high temperature tensile mechanical properties were tested by high temperature electronic tensile testing machine. The results show that the tensile yield strength of Cu 0.6% Al2O3 composites at room temperature is 442MPa and the yield strength at 600 ℃ is 154MPa. When the test temperature is lower than 300 ℃, the reduction of area is 22.2% -62.0%, the temperature is higher than 400 ℃, The cross-section shrinkage rate of 4.5% to 9.1%, showing a clear high temperature brittleness. The tensile fracture morphology and fracture mechanism were analyzed preliminarily.