Effects of Carbon Fiber Length on Creep Properties of C<sub>f</sub>/2024 Aluminum Matrix Composites Containing Sc

Du Mingzhe; Wang Jiefang; Zhang Yunjie; Yang Ruibin; Zhang Guopeng; Liu Zhongxia; Cai Bin

doi:10.15980/j.tzzz.2020.10.017

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Effects of Carbon Fiber Length on Creep Properties of C_f/2024 Aluminum Matrix Composites Containing Sc
Vol. 40, Issue 10, Pages: 1121-1126(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.10.017

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[1]杜明哲,王杰芳,张云杰,杨瑞宾,张国鹏,刘忠侠,蔡彬.碳纤维长度对C_f/2024Sc铝基复合材料蠕变性能的影响[J].特种铸造及有色合金,2020,40(10):1121-1126.

Du Mingzhe, Wang Jiefang, Zhang Yunjie, et al. Effects of Carbon Fiber Length on Creep Properties of C_f/2024 Aluminum Matrix Composites Containing Sc. [J]. Special Casting & Nonferrous Alloys 40(10):1121-1126(2020)
[1]杜明哲,王杰芳,张云杰,杨瑞宾,张国鹏,刘忠侠,蔡彬.碳纤维长度对C_f/2024Sc铝基复合材料蠕变性能的影响[J].特种铸造及有色合金,2020,40(10):1121-1126. DOI： 10.15980/j.tzzz.2020.10.017.

Du Mingzhe, Wang Jiefang, Zhang Yunjie, et al. Effects of Carbon Fiber Length on Creep Properties of C_f/2024 Aluminum Matrix Composites Containing Sc. [J]. Special Casting & Nonferrous Alloys 40(10):1121-1126(2020) DOI： 10.15980/j.tzzz.2020.10.017.

摘要

研究了不同长度（2、3、4、5mm）3%的镀铜短碳纤维增强含Sc的2024铝基复合材料的高温蠕变性能和微观结构。结果表明

在200℃、300MPa的蠕变条件下

添加了2mm碳纤维的复合材料的蠕变性能最优

其蠕变断裂时间为21.16h

稳态蠕变速率为1.05×10

-5

-1

。在不同温度（150～190℃）和不同应力（200～400MPa）蠕变条件下

复合材料的门槛应力随温度的升高而线性下降

其中添加2mm碳纤维增强复合材料的蠕变激活能最高

为83.9kJ/mol。碳纤维增强铝基复合材料的主要蠕变机制为位错攀移。

Abstract

The high temperature creep properties and microstructure of 2024 aluminum matrix composites containing Sc were investigated

which was reinforced by copper coated short carbon fiber（C

）with different lengths（2

5 mm）and the same content（3%）.The results show that the creep behavior of 2024 containing Sc composites reinforced by 2 mm carbon fiber is optimized under the creep condition of 200℃and 300 MPa

where the creep fracture time is 21.16 hand steady creep rate is 1.05×10

-5

-1

.The creep observation at different temperatures（150～190 ℃）and different stresses（200～400 MPa）shows that threshold stress of composites is decreased linearly with increasing in temperature

and 2024 containing Sc composites reinforced by 2 mm carbon fiber has the highest creep activation energy of 83.9 kJ/mol.The main creep mechanism of 2024 containing Sc aluminum matrix composites reinforced by short carbon fiber is characterized by dislocation climbing.