Mechanical properties ofB<sub>4</sub>C<sub>p</sub>/2024Al composites prepared by squeeze casting

Wang Yangwei; Zhang Weiguan; Tian Qiandong; Wang Yiming; Wang Fuchi

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Mechanical properties ofB₄C_p/2024Al composites prepared by squeeze casting
Issue S1, Pages: 428-431(2008)
Published： 2008 ，
DOI：

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[1]王扬卫,张维官,田擎东,王一鸣,王富耻.挤压铸造B_4C_p/2024Al复合材料力学性能研究[J].特种铸造及有色合金,2008(S1):428-431.

Wang Yangwei, Zhang Weiguan, Tian Qiandong, et al. Mechanical properties ofB₄C_p/2024Al composites prepared by squeeze casting. [J]. Special Casting & Nonferrous Alloys (S1):428-431(2008)
[1]王扬卫,张维官,田擎东,王一鸣,王富耻.挤压铸造B_4C_p/2024Al复合材料力学性能研究[J].特种铸造及有色合金,2008(S1):428-431. DOI：

Wang Yangwei, Zhang Weiguan, Tian Qiandong, et al. Mechanical properties ofB₄C_p/2024Al composites prepared by squeeze casting. [J]. Special Casting & Nonferrous Alloys (S1):428-431(2008) DOI：

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。

Abstract

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 flexural strength is 527 MPa

KIC is 13.56 MPa·m1/2 and the quasi-static compressive strength is 797.5 MPa

distinctly higher than that of the composite with particle size of 50μm. In addition

the dynamic compressive strength of fine-particle reinforced composite is relatively higher than that coarse-particle reinforced one. Strain dependent damage evolution leads to the strain softening

and rate dependent damage evolution caused the insensibility of strain rate or even negative strain rate effect.