WC_p/2024铝合金复合材料界面反应的分析

采用真空热压法在不同温度下制备了体积分数为12%的WCp/2024Al复合材料,试验中所用WC原始粉末的平均粒径分别为2μm和8μm.利用XRD、SEM、EDS等方法对增强颗粒与基体金属之间的界面反应进行了研究.结果表明,界面反应的主要产物为WAl12,但是当制备温度较高时,界面反应产物中出现少量Al5W,并且WCp(2μm)/2024Al复合材料界面反应的起始温度低于WCp(8μm)/2024Al复合材料.硬度测试结果表明,界面反应发生后,复合材料的硬度提高,最高比例达50%.

Analyse of the interfacial reaction in WC_p/2024Al composites

12vol% WC_p/2024 aluminium composites were fabricated by hot-pressing method at different temperatures, with WC powders in average sizes of 2μm and 8μm. Investigation on the interfacial reaction between tungsten carbide particles and the aluminium matrix was performed using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectrometry. The results show that the primary interfacial reaction produc is Wal_(12). But when the composite is hot-pressed at high temperature, a little amount of Al_5W is formed as the interfacial reaction resultant. The interfacial reaction starting temperature of WC_p(2μm)/2024Al is lower than that of WC_p(8μm)/2024Al. The hardness results show that the hardness of composites increase after interfacial reaction by nearly 50%.