Interface Effects on the Fracture Mechanism of a High-Toughness Aluminum-Composite Laminate

被引：41
|
作者：
Cepeda-Jimenez, C. M. [1 ]
Pozuelo, M. [2 ]
Garcia-Infanta, J. M. [1 ]
Ruano, O. A. [1 ]
Carreno, F. [1 ]
机构：
[1] CSIC, Dept Met Fis, CENIM, E-28040 Madrid, Spain
[2] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 01期
关键词：
FATIGUE-CRACK PROPAGATION; METAL COMPOSITES; IMPACT TOUGHNESS; MATRIX COMPOSITES; LAYER THICKNESS; BEHAVIOR; MICROSTRUCTURES; PRECIPITATION; RESISTANCE; ALLOY;
D O I：
10.1007/s11661-008-9679-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and the mechanical properties of a multilayer composite laminate based on aluminum 7075 and 2024 alloys produced by hot roll bonding were examined. The composite laminate has been tested at room temperature under Charpy-impact tests, three-point bend tests, and shear tests on the interfaces. The toughness of the post-rolling tempered and T6-treated composite laminate, measured by impact-absorbed energy in the crack-arrester orientation, was more than 20 times higher than that of the monolithic Al 7075 alloy and 7 times higher than that of Al 2024 alloy. The outstanding toughness increase of the composite laminate in the post-rolling tempered and T6-treated condition is mainly due to the mechanism of "interface predelamination.'' By this fracture mechanism, the interfaces are debonded before the main crack reaches them, warranting delamination in all interfaces. Therefore, delamination and crack renucleation in every layer are responsible for the improvement in toughness.
引用
收藏
页码：69 / 79
页数：11
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