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Materials 2016, 9(9), 764; doi:10.3390/ma9090764

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

1
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3
Electric Power Research Institute of Liaoning Electric Power Co., Ltd., Shenyang 110006, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yoshiharu Mutoh
Received: 12 July 2016 / Revised: 5 September 2016 / Accepted: 5 September 2016 / Published: 8 September 2016
(This article belongs to the Special Issue Fracture and Fatigue Mechanics of Materials)
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Abstract

Fatigue properties and cracking behavior of cold-drawn commercially pure aluminum wires (CPAWs) widely used as the overhead transmission conductors were investigated. It was found that the fracture surface of the CPAWs shows an obvious four-stage fracture characteristic, i.e., crack initiation, planar crack propagation, 45°-inclined crack propagation and final rapid fracture. The crack growth mechanisms for the CPAWs were found quite different from those for the conventional coarse-grained materials. The cracks in the CPAWs firstly grow along the grain boundaries (Stage I crack growth), and then grow along the plane of maximum shear stress during the last stage of cycling (Stage II crack growth), leading to the distinctive fracture surfaces, i.e., the granular surface in the planar crack propagation region and the coarse fatigue striations in the 45°-inclined crack propagation region. The grain boundary migration was observed in the fatigued CPAWs. The increase in fatigue load enhances the dislocation recovery, increases the grain boundary migration rate, and thus promotes the occurrence of softening and damage localization up to the final failure. View Full-Text
Keywords: commercially pure aluminum conductor; cold drawing; tension–tension fatigue; grain boundary migration; fracture commercially pure aluminum conductor; cold drawing; tension–tension fatigue; grain boundary migration; fracture
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MDPI and ACS Style

Hou, J.-P.; Wang, Q.; Yang, H.-J.; Wu, X.-M.; Li, C.-H.; Zhang, Z.-F.; Li, X.-W. Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire. Materials 2016, 9, 764.

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