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)s^(-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。
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(Cf)with different lengths(2,3,4,5 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)s^(-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.
作者
杜明哲
王杰芳
张云杰
杨瑞宾
张国鹏
刘忠侠
蔡彬
Du Mingzhe;Wang Jiefang;Zhang Yunjie;Yang Ruibin;Zhang Guopeng;Liu Zhongxia;Cai Bin(Key Laboratory of Materials Physics Ministry of Education,Zhengzhou University)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第10期1121-1126,共6页
Special Casting & Nonferrous Alloys
基金
河南省高等学校重点科研基金资助项目(17A430001)
关键词
铝基复合材料
短碳纤维
时效
蠕变
Aluminum Matrix Composites
Short Carbon Fiber
Aging
Creep
作者简介
第一作者:杜明哲,男,1995年出生,硕士研究生,郑州(450052),电话:17671802570,E-mail:dmzwall@163.com;通信作者:王杰芳,女,1968年出生,教授,郑州(450001),电话:13623712015,E-mail:wangjfrose@126.com
