In situ 3D characterization of high temperature fatigue damage mechanisms in a cast aluminum alloy using synchrotron X-ray tomography

SCRIPTA MATERIALIA

卷:113

Article

Dezecot, Sebastien^1,2,3  Buffiere, Jean-Yves¹  Koster, Alain²  Maurel, Vincent²  Szmytka, Fabien³  Charkaluk, Eric⁴  Dahdah, Nora^4,5  El Bartali, Ahmed^4,5  Limodin, Nathalie⁴  Witz, Jean-Francois⁴ 

[1] Inst Natl Sci Appl, MATEIS, CNRS UMR 5510, F-69621 Villeurbanne, France

[2] PSL Res Univ, MINES ParisTech, MAT Ctr Mat, CNRS UMR 7633, F-91003 Evry, France

[3] PSA Peugeot Citroen, Direct Rech & Innovat Automobile, F-78943 Velizy Villacoublay, France

[4] CNRS UMR 8107, LML, F-59650 Villeneuve Dascq, France

[5] Ecole Cent Lille, F-59650 Villeneuve Dascq, France

关键词: Tomography;    Fatigue;    High-temperature;    Aluminum alloy;    Cracks;   

DOI  :  10.1016/j.scriptamat.2015.11.017

来源: Elsevier

【 摘 要 】

Fatigue tests were performed at 250 degrees C on a cast AlSi7Cu3Mg aluminum alloy and monitored with Synchrotron in situ X-ray tomography in order to understand the micro-mechanisms of crack initiation and propagation. The analysis of the 3D images reveals that internal shrinkage pores are responsible for the main crack initiation. Crack propagation is mainly due to the complex and highly interconnected network of hard particles of the eutectic regions. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

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