Effect of chemical milling on low-cycle fatigue behavior of an Al-Mg-Si alloy

被引：10
|
作者：
Spear, Ashley D. [1 ]
Ingraffea, Anthony R. [1 ]
机构：
[1] Cornell Univ, Sch Civil & Environm Engn, Ithaca, NY 14853 USA
来源：
CORROSION SCIENCE | 2013年 / 68卷
基金：
美国国家科学基金会;
关键词：
Aluminum; SEM; Alkaline corrosion; Corrosion fatigue; Pitting corrosion; PITTING CORROSION; ALUMINUM-ALLOY; CRACK GROWTH; SURFACE-ROUGHNESS; INITIATION; CRYSTALLOGRAPHY; DAMAGE;
D O I：
10.1016/j.corsci.2012.11.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of alkaline chemical milling used for dimensionally reducing aluminum-alloy structures is assessed in terms of total fatigue life and crack-initiation mechanisms. Chemically milled Al-Mg-Si specimens exhibited a 50% reduction in average fatigue lives compared to electropolished Al-Mg-Si specimens at comparable peak-applied loads above macroscopic yield. The fatigue-life reduction of the chemically milled specimens is likely associated with early onset of crack initiation due to pit-induced-stress concentrations. Fractographic analyses suggest a transition in the crack-initiation mechanisms from predominantly {111}-slip plane cracking to partly or predominantly pit-induced-stress driven depending on the depth of surface pits. (C) 2012 Elsevier Ltd. All rights reserved.
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页码：144 / 153
页数：10
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