石墨烯含量和温度对纳米多晶铝拉伸力学性能的影响  

Influence of graphene content and temperature on tensile mechanical properties of nano-poly crystalline aluminum

作　　者：周浉懿 付永红[1,2] 郜向发 陈懿德 李攀 马志清 ZHOU Shi-yi;FU Yong-hong;GAO Xiang-fa;CHEN Yi-de;LI Pan;MA Zhi-qing(School of Mechanical and Electrical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Key Laboratory of Nanotechnology in Western Province,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学机电工程学院,陕西西安710055 [2]陕西省纳米重点实验室,陕西西安710055

出　　处：《塑性工程学报》2025年第4期225-235,共11页Journal of Plasticity Engineering

摘　　要：利用分子动力学方法对纳米多晶铝中掺杂含量0%~3.25%石墨烯进行了拉伸模拟实验。利用共邻分析法表征了纳米多晶铝基复合材料在拉伸载荷作用下的微观结构变化。拉伸模拟结果表明:随着石墨烯含量的提高,铝基复合材料的屈服应力呈先上升后下降趋势,且3%石墨烯含量能有效阻碍位错的运动,铝合金基体复合材料强度增强20%~30%;此外,当石墨烯含量为3%时,100~500 K单轴拉伸实验结果表明,随着温度的升高,铝基复合材料的剪切模量和屈服应力呈近似线性下降趋势。由此证实,温度升高时,材料在拉伸载荷下容易达到塑性阶段,在高温下高分子材料的力学性能下降。Molecular dynamics(MD)method was used to conduct tensile simulation experiments on nono-polycrystalline aluminum with graphene content of 0%-3.25%.The microstructure changes of nano-poly crystalline aluminum matrix composites under tensile loading were characterized by common neighbor analysis(CNA).The tensile simulation results show that with the increase of graphene content,the yield stress of aluminum matrix composite shows the trend of first increase and then decrease,and a 3%content of graphene can effectively hinder the movement of dislocations,resulting in a 20%-30%increase in the strength of aluminum matrix composites.In addition,when the graphene content is 3%,the uniaxial tensile experiment results at 100-500 K show that with the increase of temperature,the shear modulus and yield stress of aluminum base composites show an approximately linear decreasing trend.It is proved that the material easily reaches the plastic stage under tensile load when the temperature rises,and the mechanical properties of polymer materials decrease at high temperatures.

关 键 词：石墨烯/铝基复合材料 分子动力学 力学性能 位错 

分 类 号：TB331[一般工业技术—材料科学与工程]