Short-process thixoforming of nano-particles reinforced aluminium matrix composites with a high solid fraction

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2021-01-02 DOI:10.1080/13640461.2020.1863538

Xiao-Hui Chen, Guiwu Liu, Ping Chen, Lei Liu, Senlin Rao, Yong Hu

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引用次数: 1

Abstract

ABSTRACT The composite components with complex-shape and containing different nanoparticle contents and sizes were successfully produced by the short-process thixoforming. Based on the developed constitutive model, numerical simulation of thixoforming for the composites with a high solid fraction was carried out, and the relevant experiments were performed. The influences of temperature and forming rate on strain-stress were analysed. Furthermore, the effects of temperature, moving rate of the die and holding time on the filling behaviour were discussed. Results of numerical simulation revealed that at high temperature and high forming rate, uniformly distributed stress-strain field and reduced maximum forming force could be obtained, which is advantageous for avoiding the non-uniform composition and incomplete filling caused by liquid-phase segregation; they were consistent with experimental results. After T6 heat treatment, the average yield strength and ultimate tensile strength of the parts were significantly improved. Moreover, the fracture mechanism of the part was discussed.

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高固相含量纳米颗粒增强铝基复合材料的短工艺触变成形

摘要采用短工艺触形成形技术，成功制备了形状复杂、纳米颗粒含量和粒径不同的复合材料。基于所建立的本构模型，对高固含量复合材料的触变成形进行了数值模拟，并进行了相关实验。分析了温度和成形速率对应变-应力的影响。讨论了温度、模具移动速度和保温时间对充型性能的影响。数值模拟结果表明:在高温、高成形速率下，可获得均匀分布的应力应变场和减小的最大成形力，有利于避免液相偏析引起的成分不均匀和充型不完全;它们与实验结果一致。经过T6热处理后，零件的平均屈服强度和极限抗拉强度均有显著提高。并对零件的断裂机理进行了探讨。

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.