In situ Formed α-Al2O3 Nanocrystals Repaired the Preexisting Microcracks in Plasma-Sprayed Al2O3 Coating via Stress-Induced Phase Transformation

被引：6
作者：
Yang, Kai [1 ,2 ]
Feng, Jingwei [1 ,3 ]
Rong, Jian [1 ,2 ]
Liu, Chenguang [1 ,2 ]
Tao, Shunyan [1 ,2 ]
Ding, Chuanxian [1 ,2 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China
[2] Chinese Acad Sci, Key Lab Inorgan Coating Mat, Shanghai 201899, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Ceram, Inorgan Mat Anal & Testing Ctr, Shanghai 200050, Peoples R China
来源：
JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2016年 / 25卷 / 03期
关键词：
alpha-Al2O3; nanocrystals; Al2O3; coating; plasma spraying; stress-induced phase transformation; transmission electron microscopy (TEM); MECHANICAL-PROPERTIES; MICROSTRUCTURE; ALUMINA; BEHAVIOR;
D O I：
10.1007/s11666-015-0367-3
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the present study, the phase composition and generation mechanism of the nanocrystals located in the microcracks of plasma-sprayed Al2O3 coating were reevaluated. The Al2O3 coatings were investigated using transmission electron microscopy and x-ray diffraction. We supply the detailed explanations to support the new viewpoint that in situ formation of alpha-Al2O3 nanocrystals in the preexisting microcracks of the as-sprayed Al2O3 coating may be due to the stress-induced phase transformation. Owing to the partially coherent relationship, the phase interfaces between the alpha-Al2O3 nanocrystals with the preferred orientation and the c-Al2O3 matrix may possess better bonding strength. The alpha-Al2O3 nanocrystals could repair the microcracks in the coating, which further strengthens grain boundaries. Grain boundary strengthening is beneficial to the coating fracture toughness enhancement.
引用
收藏
页码：518 / 525
页数：8
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