The crack propagating behavior of composite coatings prepared by PEO on aluminized steel during in situ tensile processing

被引：24

作者：

Chen, Zhitong ^{[1
,2
]}

Li, Guang ^{[1
]}

Wu, Zhenqiang ^{[1
,3
]}

Xia, Yuan ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[3] Beijing Inst Struct & Environm Engn, Beijing 100076, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 03期

关键词：

Plasma electrolytic oxidation; Composite coatings; In situ tensile test; Thickness ratio; Crack opening displacement; PLASMA ELECTROLYTIC OXIDATION; MECHANICAL-PROPERTIES; MICROARC OXIDATION; CERAMIC COATINGS; MAGNESIUM ALLOY; OXIDE COATINGS; AL2O3; COATINGS; MG ALLOY; CORROSION; SUBSTRATE;

D O I：

10.1016/j.msea.2010.10.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper investigates the in situ tensile cracks propagating behavior of composite coatings on the aluminized steel generated using the plasma electrolytic oxidation (PEO) technique. Cross-sectional micrographs and elemental compositions were investigated by scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The composite coatings were shown to consist of Fe-Al, Al and Al2O3 layers. The cracks propagating behavior was observed in real-time in situ SEM tensile test. In tensile process, the cracks were temporarily stopped when cracks propagated from Fe-Al layer to Al layer. The critical crack opening displacement delta(c) was introduced to quantitatively describe the resistance of the Al layer. There was a functional relation among the thickness ratio t(Al)/t(Al2O3), the delta(c) of composite coatings and tensile cracks' spacing. The delta(c) increased with the increasing of the thickness ratio (t(Al)/t(Al2O3)). The high delta(c) value means high fracture resistance. Therefore, a control of the thickness ratio t(Al)/t(Al2O3) was concerned as a key to improve the toughness and strength of the aluminized steel. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1409 / 1414

页数：6

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