SPS工艺对石墨烯增强铝基复合材料拉伸性能的影响
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摘要
利用放电等离子烧结(SPS)技术在不同烧结温度及烧结时间下制备了石墨烯纳米片增强铝基复合材料(GNFs/Al),并对其微观组织及拉伸性能进行分析。结果表明,较低温度(500℃)烧结时,GNFs/Al复合材料界面结合力较弱,其拉伸性能差;较高温度(560及590℃)烧结可增强界面结合力,此时快速烧结能抑制界面反应的发生,有利于获得拉伸性能良好的GNFs/Al复合材料。560℃快速烧结制备的GNFs/Al依靠铝基体晶粒的细化及应力转移,其抗拉强度比纯铝提高了31%。
Graphene nanosheet reinforced aluminum composites(GNFs/Al) containing 0.5 wt% GNFs were fabricated by spark plasma sintering(SPS) with different temperatures and holding time. The microstructure and tensile properties of the composites were investigated. The results show that the composites sintered at lower temperatures(500 oC) possess weaker interfacial bonding, which results in lower tensile properties. When sintered at higher(560 and 590 oC) temperatures, the interfacial bonding of the composites is obviously enhanced. To avoid interfacial reactions at higher temperatures, rapid sintering is essential. Therefore, the composites sintered at 560 oC/4 min exhibit a tensile strength of 142 MPa, which is 31% higher than that of pure Al. The enhanced tensile properties of the GNFs/Al composites in this study can be ascribed to the refinement and stress transfer of the aluminum matrix grains.
Graphene nanosheet reinforced aluminum composites(GNFs/Al) containing 0.5 wt% GNFs were fabricated by spark plasma sintering(SPS) with different temperatures and holding time. The microstructure and tensile properties of the composites were investigated. The results show that the composites sintered at lower temperatures(500 oC) possess weaker interfacial bonding, which results in lower tensile properties. When sintered at higher(560 and 590 oC) temperatures, the interfacial bonding of the composites is obviously enhanced. To avoid interfacial reactions at higher temperatures, rapid sintering is essential. Therefore, the composites sintered at 560 oC/4 min exhibit a tensile strength of 142 MPa, which is 31% higher than that of pure Al. The enhanced tensile properties of the GNFs/Al composites in this study can be ascribed to the refinement and stress transfer of the aluminum matrix grains.
引文
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