In situ observation of small fatigue cracks in SiCp/Al2024 composites

被引：0

作者：

Akiniwa, Yoshiaki

Tanaka, Keisuke

Shimizu, Kenichi

Hagiwara, Takaaki

机构：

来源：

Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A | 1996年 / 62卷 / 603期

关键词：

Aluminum alloys - Crack initiation - Crack propagation - Fatigue of materials - Fatigue testing - Fracture - Scanning electron microscopy - Silicon carbide;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Fatigue tests were conducted on aluminum alloy (2024-T6) reinforced with 20 volume percent and two different sizes of SiC particles using a specially designed servo-hydraulic fatigue testing equipped machine in a scanning electron microscope. The influence of reinforcement-particle size on the initiation and propagation behavior of small fatigue cracks in a smooth specimen was examined. In the case of fine particle-reinforced composites, crack initiation was associated with matrix slip in a particle-rich region. When the crack propagated from the particle-rich region to a matrix-rich region, sub-crack and crack bridging by particles were observed. In the case of coarse particle-reinforced composites, cracks were mainly initiated by particle cracking, and particle fracture ahead of a main crack and crack bridging by an uncracked ligament were observed.

引用

页码：2506 / 2512