摘要
采用挤压铸造工艺制得粒径分别为25μm和50μm、体积分数为50%的两种B4Cp/2024Al复合材料。测试了复合材料的密度、硬度、抗弯强度、静态压缩强度、断裂韧度;采用霍普金森压杆装置研究了复合材料在高应变速率下的压缩强度。研究结果表明,50%B4Cp/2024Al复合材料的密度约为2.7g/cm3,硬度(HRA)为60;25μmB4Cp增强的复合材料抗弯强度为527MPa,断裂韧度KIC达到13.56MPa.m1/2,而静态压缩强度为797.5MPa,其性能显著高于50μm粒度B4C增强的复合材料。细颗粒增强的复合材料动态压缩强度高于粗颗粒增强的复合材料;应变相关的损伤演化使得复合材料表现出应变软化现象,相关损伤导致压缩强度呈现应变率不敏感甚至是负敏感特征。
Two types of 50vol%B4Cp/2024Al composites with the particle size of 25 μm and 50 μm were prepared by squeeze casting. The density, hardness, flexural strength, quasi-static compressive strength, KIC of composites was tested, and the dynamic compressive strength under high strain rate load was examined by Split Hopkinson Pressure Bar system. The results show that: The density of 50vol%B4Cp/2024Al composite is 2.7 g/cm3, and the hardness is 60 HRA; When the size of B4C particles is 25 μm, the composite s flex...
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第S1期428-431,共4页
Special Casting & Nonferrous Alloys
关键词
挤压铸造
金属基复合材料
力学性能
高应变率
尺寸效应
squeeze casting
metal matrix composites
mechanical properties
high strain rate
size effect
