Nanoscale perspective on the stress-corrosion cracking behavior of a peak-aged 7XXX-Al alloy

被引：7
|
作者：
Freixes, Marti Lopez [1 ]
Peguet, Lionel [2 ]
Warner, Timothy [2 ]
Gault, Baptiste [1 ,3 ]
机构：
[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
[2] C TEC Constellium Technol Ctr, Parc Econ Centralp,CS 10027, F-38341 Voreppe, France
[3] Imperial Coll London, Royal Sch Mines, Dept Mat, Prince Consort Rd, London SW7 2BP, England
来源：
CORROSION SCIENCE | 2024年 / 229卷
基金：
欧洲研究理事会;
关键词：
Stress corrosion; Aluminium; Hydrogen embrittlement; ENVIRONMENTALLY ASSISTED CRACKING; MELTING POINT ELEMENTS; PERSISTENT SLIP BANDS; CU ALUMINUM-ALLOYS; HYDROGEN EMBRITTLEMENT; ELECTROCHEMICAL-BEHAVIOR; INDUCED DISSOLUTION; AL; MICROSTRUCTURE; PRECIPITATION;
D O I：
10.1016/j.corsci.2024.111904
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High -strength 7xxx Al -alloys are used in aerospace and are expected to be increasingly employed in the automotive sector for "lightweighting" but they can be sensitive to stress -corrosion cracking (SCC) depending on temper and loading conditions. Here, we performed double cantilever beam (DCB) crack growth tests and study at the nanoscale stress -corrosion cracks on two compositional variants of AA7140 from different regions of a thick -plate. We report on precipitate dissolution, matrix solute enrichment near the crack tips and a modified microstructure ahead of the crack. We relate our findings with the SCC behaviour on both samples and propose an array of active mechanisms.
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收藏
页数：11
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