(1.上海交通大學(xué) 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室，
上海 200030;
2.上海大學(xué) 材料科學(xué)與工程學(xué)院，上海 200072)
摘 要: 研究了用于電車線材料的自生復(fù)合Cu-Cr合金的綜合性能及其熱穩(wěn)定性。實(shí)驗(yàn)表明：自生復(fù)合Cu-Cr合金不僅在室溫下具有優(yōu)良的綜合性能M指標(biāo)(σ2b· σr)， 而且還具有良好的熱穩(wěn)定性。室溫下，自生復(fù)合Cu-Cr合金線的綜合性能可高達(dá)18.3×106MPa2·%，高于目前所知各種銅合金電車線；而在500℃，3h加熱保溫條件下，自生復(fù)合Cu-Cr合金的綜合性能僅下降3%。同時分析了自生復(fù)合合金熱穩(wěn)定性與強(qiáng)化機(jī)制的關(guān)系。
關(guān)鍵字: 自生復(fù)合；Cu-Cr合金；熱穩(wěn)定性；M指標(biāo)
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
