摘要
将石墨填入纯铝1060板材中,通过旋转摩擦挤压(RFE)的方法实现石墨的原位剥离而制备石墨烯增强铝基复合材料,研究了石墨与基体组织的演变、复合材料的界面结构与力学性能。结果表明,石墨在RFE大塑性变形作用下分散于基体的同时,被破碎并原位剥离出大量5~12层的石墨烯,添加石墨使基体晶粒得到明显细化、大角度晶界增加;石墨破碎产生大量的边缘缺陷有利于原子的扩散,结果在石墨烯和基体间易形成扩散界面,比机械结合界面更有利于载荷的传递;可能主要归因于载荷传递和Hall-Petch强化,添加石墨使材料的力学强度明显提高,特别当添加石墨质量分数0.82%时,复合材料的屈服强度和抗拉强度达到76.4和163.2 MPa,较同等条件RFE的基体分别提高了91%和71.4%,取得了较好的增强效果,此时复合材料的延伸率虽比基体有所下降,但也达到25.3%,有较好的强塑性配合。
In this paper,a successful attempt was demonstrated to prepare graphene reinforced aluminum matrix composites by in situ exfoliation of graphite flakes(GFs)using rotational friction extrusion(RFE)method.It is found that the GFs are broken on a large scale and uniformly dispersed into the aluminum matrix during PRE.EBSD analysis indicates that the grain is significantly refined,the fraction of high angle grain boundaries is increased.As revealed by HRTEM that a number of 5~12 layer graphene can be peeled off from the GFs owing to the severe plastic deformation of RFE,and there exists obvious transition at the graphene-aluminum interface due to the diffusion of carbon atom at the broken graphene edge,which provides an efficient load transfer for the composites.The yield strength and ultimate tensile strength of the prepared composites with GFs addition of 0.82wt%are 76.4 and 163.2 MPa,which are 91%and 71.4%higher than those of the RFEed base metal(1060 Al),respectively.Meanwhile,the elongation of the composites is 25.3%,and a good strength-ductility balance is obtained.Combined with theoretical calculations,it is found that the main strengthening contribution is most likely attributed to the load transfer and Hall-Petch mechanism.
作者
曹建
缪宇
夏春
黄春平
柯黎明
Cao Jian;Miao Yu;Xia Chun;Huang Chunping;Ke Liming(National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第11期4289-4296,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52065047)
江西省自然科学基金(20202BABL204003)
南昌航空大学研究生创新专项基金(YC2020-028)。
关键词
石墨烯增强铝基复合材料
旋转摩擦挤压
石墨
原位剥离
力学性能
graphene/aluminum composites
rotational friction extrusion
graphite
in situ exfoliation
mechanical properties
