Hot deformation behavior and microstructure of a 0.5 wt% graphene nanoplatelet reinforced aluminum composite

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2022-01-01 DOI:10.1515/secm-2022-0009

S. Lou, Xin Li, G. Guo, Ling Ran, Yongqiang Liu, P. Zhang, C. Su

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引用次数: 1

Abstract

Abstract Through hot compression experiments at temperatures ranging from 603 to 723 K and strain rates ranging from 0.01 to 10 s−1, the hot deformation behavior of a 0.5 wt% graphene nanoplatelet-reinforced aluminum (0.5 wt% GNP/Al) composite prepared by the powder metallurgy method was studied. The constitutive equations obtained by mathematical models and a neural network were evaluated. The deformation property of the composite can be better described by the Johnson–Cook (JC) constitutive model optimized by establishing a relationship between the coefficient and variables obtained in the hot compression test, with a correlation coefficient (R) reaching 99.97% with the average relative error of 0.37% (98.1 and 4.17%, respectively, before optimization). Compared with the JC model, the neural network has perfect calculation accuracy and whole-process effectiveness, providing expanded and more accurate constitutive equations for subsequent simulations and for building the dynamic recrystallization model of the composite. The dynamic recrystallization model, hot processing map, and EBSD results are in agreement with each other and indicate that the optimal strain rate and temperature range of the composite are 0.01–0.1 s−1 and 693–723 K, respectively.

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0.5的热变形行为和微观结构 wt%石墨烯纳米片增强铝复合材料

摘要通过在603到723温度范围内的热压缩实验 K和应变率范围从0.01到10 s−1，0.5 重量百分比石墨烯纳米片增强铝（0.5 wt%GNP/Al）复合材料。对通过数学模型和神经网络获得的本构方程进行了评估。Johnson–Cook（JC）本构模型通过建立热压缩试验中获得的系数和变量之间的关系进行优化，可以更好地描述复合材料的变形性能，相关系数（R）达到99.97%，平均相对误差为0.37%（优化前分别为98.1%和4.17%）。与JC模型相比，该神经网络具有完美的计算精度和全过程有效性，为后续模拟和建立复合材料动态再结晶模型提供了扩展的、更准确的本构方程。动态再结晶模型、热处理图和EBSD结果一致，表明复合材料的最佳应变速率和温度范围为0.01–0.1 s−1和693–723 K、分别。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.