Influence of SiC Particle Volume Fraction on the Compressive Behavior of SiC<sub>p</sub>/2024 Composites in Semi-solid State

Luo Shoujing Zu Lijun Du Zhiming

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Influence of SiC Particle Volume Fraction on the Compressive Behavior of SiC_p/2024 Composites in Semi-solid State
Issue S1, Pages: 145-147(2001)
Published：2001
DOI：
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[1]罗守靖,祖丽君,杜之明.SiC颗粒对SiC_p/2024复合材料半固态下压缩行为的影响[J].特种铸造及有色合金,2001(S1):145-147. DOI：

Luo Shoujing Zu Lijun Du Zhiming. Influence of SiC Particle Volume Fraction on the Compressive Behavior of SiC_p/2024 Composites in Semi-solid State[J]. Special Casting & Nonferrous Alloys, 2001, (S1): 145-147. DOI：

摘要

研究了部分重熔SiCp/2024复合材料的微观组织特征和压缩行为

SiC颗粒体积分数分别为10％和20％。复合材料采用粉末冶金法制备

并经高温挤压得到复合材料棒

挤压比为16:1。挤压态复合材料加热到半固态温区在应变速率为0.012 s-1～0.060 s-1范围内进行单轴压缩试验

研究了SiC颗粒体积分数、加热温度和应变速率对复合材料半固态压缩行为的影响规律。流变学分析表明

部分重熔复合材料类似非牛顿流体

可用Norton-Hoff定律来描述

σ=Kεm值在0.25～0.45范围内。

Abstract

This paper is concerned with the microstructural characterization and compressive behavior of partially remelted 2024 alloys reinforced with 10% and 20% SiC particle. The composites were fabricated by the powder metallurgy technique and subsequently extruded at high temperature with an extrusion ratio of 16:1. Specimens obtained from the extruded bars were therefore deformed in uniaxial compression in the semi-solid state at different constant strain rates ranging from 0.012 s-1 to 0.060 s-1. The influence of SiC particle volume fraction

remelted temperature and strain rates on the compressive behavior of SiCp/2024 composites were investigated. A reheological analysis shows that the partially remelted composites behave as non-newtonian fluids

following Norton-Hoff law of the type with m in the range 0.2- 0.45. The compressive stress of composites decreases strongly with increasing the remelted temperature and increases with increasing the SiC particle volume fraction. The strain rate sensitivity m is independent of particle volume fraction.