Microstructural aspects of crack nucleation during cyclic loading of AA7075-T651

被引：35

作者：

Weiland, H. ^{[1
]}

Nardiello, J. ^{[2
]}

Zaefferer, S. ^{[3
]}

Cheong, S. ^{[1
]}

Papazian, J. ^{[2
]}

Raabe, Dierk ^{[3
]}

机构：

[1] Alcoa Inc, Alcoa Ctr, PA 15069 USA

[2] Northrop Grumman AEW EW Syst, Bethpage, NY 11714 USA

[3] Max Planck Inst Iron Res, D-40237 Dusseldorf, Germany

来源：

ENGINEERING FRACTURE MECHANICS | 2009年 / 76卷 / 05期

关键词：

Crack initiation; AA7075; 3D microstructure; Fatigue; ALLOY;

D O I：

10.1016/j.engfracmech.2008.11.012

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A series of fatigue test samples made of 7075-T651 aluminum were interrupted at various life fractions and the number of debonded, cracked particles and cracks in the metal matrix was determined quantitatively as a function of load cycles. It was found that only cracked constituent particles nucleate a matrix crack. The crystallography of one individual crack and its three-dimensional shape was determined by serial sectioning in a scanning electron microscope by applying focused ion beam (FIB) milling in combination with orientation imaging microscopy (OIM). The limited data suggest that the initial growth direction of a crack is influenced by the crystallographic orientation of the matrix into which the crack is growing. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：709 / 714

页数：6

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