洪起虎 燕绍九 陈 翔 李秀辉 彭思侃

(北京航空材料研究院石墨烯及应用研究中心)

摘 要：采用湿法球磨+热等静压烧结的方法制备了石墨烯含量为0.5%的Al-Li基复合材料，并对其在热压缩过程中的流变应力和变形组织进行了研究。结果表明，应力应变曲线呈“应变软化”型，应变速率越高、变形温度越低，流动应力越大。基于Arrhenius方程计算获得了石墨烯/Al-Li基复合材料热变形激活能为222.15 kJ/mol，建立了复合材料的热变形本构方程。

关键词：石墨烯/Al-Li基复合材料；热变形行为；流变应力方程

中图分类号：TB333  文献标志码A

DOI：10.15980/j.tzzz.2020.07.024

Preparation and Hot Deformation Behavior of Graphene/Aluminum Lithium Matrix Composite

Hong Qihu, Yan Shaojiu, Chen Xiang, Li Xiuhui, Peng Sikan

(Research Center of Graphene Applications, Beijing Institute of Aeronautical Materials)

Abstract: Graphene/aluminum lithium matrix composites were prepared by wet milling and hot isostatic pressing process, and then the hot deformation behavior of graphene/aluminum lithium matrix composites was investigated by Gleeble 3500 thermal simulation machine at deformation temperature in range of 400~430 ℃and strain rate in range of 0.001~10 s^-1. The results reveal that stress strain curves are presented as strain soften behavior, where with increasing in strain rate and decreasing in deformation temperature, the flow stress is increased. Based on the Arrhenius equation, the hot deformation activation energy Q was calculated as 222.15 kJ/mol, and the hot deformation constitutive equation was established.

Key Words: Graphene/Aluminum Lithium Matrix Composite, Hot Deformation Behavior, Flow Stress Constitutive Equation