时效处理对石墨烯/Al-Zn-Mg-Cu合金复合材料性能的影响  

Effect of aging treatment on properties of graphene/Al-Zn-Mg-Cu alloy composites

作　　者：郝莹 王明伟 Hao Ying;Wang Mingwei(College of Intelligent Engineering,Taishan College of Science and Technology,Taian Shandong 27100,China)

机构地区：[1]泰山科技学院智能工程学院,山东泰安271000

出　　处：《金属热处理》2025年第1期133-139,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(12102492);山东省自然科学基金(ZR2020KA007)。

摘　　要：以Al-Zn-Mg-Cu合金粉为基体,石墨烯为增强相,采用真空热压烧结和热挤压工艺制备0.5wt%石墨烯增强Al-Zn-Mg-Cu基复合材料,并对其进行固溶时效处理,研究时效工艺对复合材料性能的影响及石墨烯对Al-Zn-Mg-Cu基体的增强机制。结果表明,在120℃时效24 h条件下复合材料的力学性能最佳,抗拉强度达到505.92 MPa。由显微组织表征可知,120℃时效24 h条件下复合材料中黑色块状第二相最多,主要是石墨烯以及少量的析出相,石墨烯增强相弥散分布于大晶粒的晶界处,会钉扎晶界,减少亚晶界的合并,从而阻碍位错运动。经T6时效(120℃×24 h)的石墨烯/Al-Zn-Mg-Cu复合材料中MgZn_(2)相和Mg_(2)Si相较多。石墨烯的加入也有利于第二相的析出,更容易钉扎晶界,有利于力学性能的改善。Al-Zn-Mg-Cu matrix composites reinforced with 0.5wt% GNPs were prepared by vacuum hot pressing sintering and hot extrusion process with Al-Zn-Mg-Cu alloy powder as matrix and graphene as reinforcing phase.The effect of aging treatment on the properties of composites and the strengthening mechanism of graphene on the Al-Zn-Mg-Cu matrix were studied.The results show that the mechanical properties of the composites are the best after aging at 120 ℃ for 24 h,and the tensile strength reaches 505.92 MPa.From the microscopic characterization,it can be seen that the black block second phase in the composite material is the most,mainly graphene and a small amount of precipitated phase after aging at 120 ℃ for 24 h.The reinforced phase graphene is dispersed at the grain boundary of the large grain,which can pin the grain boundary and reduce the merging of the subgrain boundaries,thus hindering the dislocation movement.The MgZn_(2) and Mg_(2Si) phases in the composites aged at 120 ℃ for 24 h are the most.The addition of graphene is also beneficial to the precipitation of the second phase,which is easier to pin the grain boundary and improve the mechanical properties.

关 键 词：石墨烯/Al-Zn-Mg-Cu复合材料 时效热处理 力学性能 微观结构表征 

分 类 号：TG166.3[金属学及工艺—热处理]