短碳纤维增强2024铝基复合材料微屈服行为研究  

Micro-Yield Behaviors of Short Carbon Fiber Reinforced 2024 Alloy Matrix Composites

作　　者：邓高生 杨瑞宾[1] 刘忠侠[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室

出　　处：《特种铸造及有色合金》2016年第6期637-640,共4页Special Casting & Nonferrous Alloys

摘　　要：采用液态搅拌铸造制出了纤维长度分别为2mm和3mm、含量为2%的短碳纤维增强的含Sc的2024铝基复合材料。用加载-卸载法研究了两种材料不同时效态的微屈服性能。结果表明,短碳纤维增强2024铝基复合材料的微屈服强度具有宏观强度时效强化规律特征。峰值时效的材料具有最高的微屈服强度;微屈服阶段硬化率先增大后减小,均远高于宏观屈服初期硬化率。相比于2mm碳纤维,3mm碳纤维增强的含Sc的2024铝基复合材料具有更高的微屈服强度。2% short carbon fiber with a length of 2mm and 3mm reinforced 2024 Al contained Sc matrix composites were fabricated by liquid stirring casting method.The micro-yield behaviors of the composites treated with various aging process were measured by load-unload method.The results reveal that the micro-yield strength of the short carbon fiber reinforced 2024 matrix composites exhibits the same aging hardening charateristics as the macroscopic strength.The composites treated with peak aging process have the highest micro-yield strength.The strain-hardening rate of the materials is the greater than macroscopic yield and always increased firstly and then decreased during micro yield.The materials strengthened with 3mm carbon fiber exhibit the higher micro-yield strength than that of ones reinforced with 2mm carbon fiber.

关 键 词：铝基复合材料 微屈服 碳纤维长度 时效工艺 

分 类 号：TB333[一般工业技术—材料科学与工程]