(1.上海交通大学 金属基复合材料国家重点实验室，
上海 200030;
2.上海大学 材料科学与工程学院，上海 200072)
摘 要: 研究了用于电车线材料的自生复合Cu-Cr合金的综合性能及其热稳定性。实验表明：自生复合Cu-Cr合金不仅在室温下具有优良的综合性能M指标(σ2b· σr)， 而且还具有良好的热稳定性。室温下，自生复合Cu-Cr合金线的综合性能可高达18.3×106MPa2·%，高于目前所知各种铜合金电车线；而在500℃，3h加热保温条件下，自生复合Cu-Cr合金的综合性能仅下降3%。同时分析了自生复合合金热稳定性与强化机制的关系。
关键字: 自生复合；Cu-Cr合金；热稳定性；M指标
properties of in-situ composite
Cu-Cr alloy
（1.State Key Laboratory for Metal Matrix Composites,
Shanghai Jiaotong University, Shanghai 200030, China;
(2. School of Materials Science and Engineering,
Shanghai University, Shanghai 200072, China）
Abstract:The synthetic properties and the thermal stability of in-situ composite Cu-Cr alloy, which is potentially used for trolley cables, were reported. T he results show that in-situ composite Cu-Cr alloy has not only high mechanical properties (ultimate tensile strength σb and elongation rate (δ)) and good relative conductivity σr, i.e., good synthetic property that is scaled by M index (σ2b·σr), under condition of room temperature, but also excellent thermal stability of the synthetic property. At room temperature, the synthetic property of in-situ composite Cu-Cr could be up to 18.3×106MPa2·%, which is higher than those of commonly used copper contact cables. Being heated for 3h at 500℃, the synthetic property of in-situ composite Cu-Cr alloy only decreased by 3%. And the relationship between thermal stability and strengthening mechanism of in-situ composite alloy were also analyzed.
Key words: in-situ composite; Cu-Cr alloy; thermal stability; M index
