Fracture toughness and low cycle fatigue of 6061/A12O3p composites

Composites Engineering Pub Date : 1995-01-01 DOI:10.1016/0961-9526(95)00022-F

N.P. Hung, W. Zhou, E.T. Peh, C.S. Chan

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引用次数: 6

Abstract

This paper investigates the low cycle fatigue and fracture behavior of cast-then-hot-extruded 6061 aluminum reinforced with alumina particles. The effect of heat treatment and volume percentages of the particle (0–20%) on the axial fatigue behavior and fracture toughness was investigated. Cyclic hardening of the under-aged and the peak-aged samples was observed while cyclic softening of the over-aged specimens was recorded. Although fatigue data follow the Coffin-Manson's model, the fatigue resistance of the composites was lower than that of the matrix alloy regardless of aging and percentage of the reinforcement. Plane strain condition was marginally achieved due to insufficient sample thickness. The measured fracture toughness for these composites however was low compared with that of the matrix alloy and decreased with increasing reinforcement content. Scanning electron microscopy reveals that a crack starts at a machine defect and propagates through or avoids a particle depending on the relative position of the crack front and the particle. Three failure modes were found for this advanced material: cleavage fracture of a particle, cohesive delamination between matrix and particle and void coalescence in the matrix.

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6061/A12O3p复合材料的断裂韧性和低周疲劳性能

研究了氧化铝颗粒增强6061铝的先铸后热挤压低周疲劳和断裂行为。研究了热处理工艺和颗粒体积百分比(0 ~ 20%)对轴向疲劳性能和断裂韧性的影响。观察了欠时效和峰时效试样的循环硬化过程，记录了超龄试样的循环软化过程。尽管疲劳数据遵循Coffin-Manson模型，但无论时效和增强率如何，复合材料的抗疲劳性能都低于基体合金。由于样品厚度不足，平面应变条件勉强达到。与基体合金相比，复合材料的断裂韧性较低，且随增强量的增加而降低。扫描电子显微镜显示，裂纹从机械缺陷处开始，并根据裂纹前沿和颗粒的相对位置而通过或避开颗粒。这种先进材料的破坏模式有三种:颗粒解理断裂、基体与颗粒之间的内聚脱层和基体中的空洞聚并。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Composites Engineering

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