材料科学
复合材料
极限抗拉强度
碳纳米管
延展性(地球科学)
石墨烯
氧化物
复合数
挤压
冶金
蠕动
纳米技术
作者
Zhiyuan Xu,C.J. Li,Z. Wang,Fang Dong,Peng Gao,Jingmei Tao,Jianhong Yi,Jürgen Eckert
标识
DOI:10.1016/j.msea.2020.140067
摘要
Graphene oxide-carbon nanotubes hybrid reinforced aluminum matrix composites (GO-CNT/Al) were prepared by powder metallurgy followed by hot extrusion. The strength of the composites was improved by the synergistic effect of carbon nanotubes, in-situ Al4C3 and graphene oxide. Moreover, due to the partially recrystallization of Al matrix promoted by Al4C3, the matrix exhibits a bimodal grain distribution, which helps to enhance strain-hardening and consequently uniform tensile ductility at high flow stresses. Hence the bimodal grain structure of the matrix combined with the nano-reinforcements leads to enhancing of the strength and ductility synergy. The composite shows a high tensile strength of 249 MPa (175 MPa of pure Al) and keeps almost similar tensile ductility with pure Al (uniform elongation of ~23.1%).
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