Hardness, Electrical Conductivity and Thermal Stability of Externally Oxidized Cu-Al2O3 Composite Processed by SPD
Hardness, Electrical Conductivity and Thermal Stability of Externally Oxidized Cu-Al2O3 Composite Processed by SPD
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SPD处理的外部氧化Cu-Al2O3复合材料的硬度、电导率和热稳定性
DOI：
10.1007/s11665-017-2660-4
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发表时间：
2017
影响因子：
2.3
通讯作者：
Keming Liu
中科院分区：
文献类型：
--
作者：
Deping Lu;Jiang Jiang;Lei Lu;Xianjin Liao;Konstantin M. Nesterov;Rinat K. Islamgaliev;Ruslan Z. Valiev;Keming Liu
采用等通道转角挤压(ECAP)和高压扭转(HPT)等强塑性变形(SPD)工艺进一步强化了外氧化法制备的Cu-Al_2O_3复合材料。测试了SPD处理前后样品的高压硬度和电导率。结果表明，ECAP样品(等效应变约为5.34)的硬度增加相对较小，而电导率显著下降。HPT样品(当量应变约为6.94)不仅硬度有很大提高，而且电导率也有较高的提高。对SPD法制备的Cu-Al_2O_3复合材料的热稳定性进行了测试，发现HPT样品在600℃时仍保持了良好的高压硬度和较高的电导率。外氧化法和HPT工艺的结合提高了材料的力学性能、良好的导电性、良好的热稳定性和简化了氧化工艺。
Cu-Al2O3 composites prepared by external oxidation method were further enhanced by severe plastic deformation (SPD) processing, including equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) methods. The HV hardness and electrical conductivity of the samples before and after SPD processing were tested. Results revealed that ECAP samples (with an equivalent strain of about 5.34) showed a relative small increase in hardness, whereas a significant decrease in electrical conductivity. The HPT samples (with an equivalent strain of about 6.94) showed not only a much improved hardness but also a higher electrical conductivity. Thermal stability of the SPD-processed Cu-Al2O3 composites was tested, and the HPT samples maintained good HV hardness together with high electrical conductivity even at 600 °C. The combination of external oxidation method and HPT processing resulted in enhanced mechanical properties, good electrical conductivity, acceptable thermal stability, and much simplified oxidation process.