Quench sensitivity of toughness in an Al alloy: Direct observation and analysis of failure initiation at the precipitate-free zone

被引：85
|
作者：
Morgeneyer, T. F. [1 ,2 ]
Starink, M. J. [1 ]
Wang, S. C. [1 ]
Sinclair, I. [1 ]
机构：
[1] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
[2] Alcan Ctr Rech Voreppe, F-38341 Voreppe, France
来源：
ACTA MATERIALIA | 2008年 / 56卷 / 12期
关键词：
AA6156; quench sensitivity; precipitate-free zone; synchrotron radiation computed tomography; intergranular failure;
D O I：
10.1016/j.actamat.2008.02.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An analysis of toughness in 6156 Al-Mg-Si-Cu sheet was performed using enhanced Kahn tear tests on samples quenched at different rates. Crack initiation energies were hardly affected by changing the water quench temperature from 20 degrees C to 60 degrees C; however, a significant reduction was evident on air cooling. Crack propagation energy was reduced for both 60 degrees C water-quenched and air-cooled materials. Observation of failure initiation through synchrotron radiation computed tomography for the 60 degrees C water-quenched material revealed failure ahead of the crack tip of grain boundaries oriented at 45 degrees to the main loading axis, and crack "tongues" extending into the material ahead of the main crack. Failure was predominantly intergranular. Fractographic assessment revealed predominantly voiding and shear decohesion in the 20 degrees C water-quenched material. With the aid of the new findings, past models on the influence of precipitate-free zone parameters on toughness were revised. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2872 / 2884
页数：13
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