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Effects of High Temperature Oxidation on Mechanical Properties of Ti3AlC2
Li, Xichao; Zheng, Lili; Qian, Yuhai; Xu, Jingjun; Li, Meishuan; Li, MS (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2017-06-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume33Issue:6Pages:596-602
AbstractThe oxidation tests of Ti3AlC2 were conducted at 1100 and 1200 degrees C in air for 48 and 360 h, respectively, and the effects of high temperature oxidation on the flexural strength and hardness of Ti3AlC2 were investigated. The microstructure, grain size and phase compositions of Ti3AlC2 substrate didn't change after oxidation, hence the oxide removed Ti3AlC2 substrate maintained its initial flexural strength and hardness. However, the flexural strength of oxide retained Ti3AlC2 decreased by about 5%. Acoustic emission monitoring indicated that during the process of three-point bending test, the formed Al2O3 scale on Ti3AlC2 surface fractured firstly in a cleavage manner, then the substrate/oxide interface cracked, and finally the Ti3AlC2 substrate fractured. The mechanical degradation was caused by the preferential formation of cracks in brittle Al2O3 scale as well as at defective and lacunose grain boundaries of the substrate where stress concentration generated. The mechanical degradation was insensitive to oxidation temperature and time in the present conditions. In addition, the surface hardness increased significantly after oxidation due to the formed hard Al2O3 scale on the surface of Ti3AlC2 substrate. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; The oxidation tests of Ti3AlC2 were conducted at 1100 and 1200 degrees C in air for 48 and 360 h, respectively, and the effects of high temperature oxidation on the flexural strength and hardness of Ti3AlC2 were investigated. The microstructure, grain size and phase compositions of Ti3AlC2 substrate didn't change after oxidation, hence the oxide removed Ti3AlC2 substrate maintained its initial flexural strength and hardness. However, the flexural strength of oxide retained Ti3AlC2 decreased by about 5%. Acoustic emission monitoring indicated that during the process of three-point bending test, the formed Al2O3 scale on Ti3AlC2 surface fractured firstly in a cleavage manner, then the substrate/oxide interface cracked, and finally the Ti3AlC2 substrate fractured. The mechanical degradation was caused by the preferential formation of cracks in brittle Al2O3 scale as well as at defective and lacunose grain boundaries of the substrate where stress concentration generated. The mechanical degradation was insensitive to oxidation temperature and time in the present conditions. In addition, the surface hardness increased significantly after oxidation due to the formed hard Al2O3 scale on the surface of Ti3AlC2 substrate. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
description.department[li, xichao ; zheng, lili ; qian, yuhai ; xu, jingjun ; li, meishuan] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china ; [li, xichao] univ chinese acad sci, beijing 100039, peoples r china
KeywordTi(3)Aic(2) Oxidation Flexural Strength Hardness Bending Test Acoustic Emission
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51571205, 51271191]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78092
Collection中国科学院金属研究所
Corresponding AuthorLi, MS (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Li, Xichao,Zheng, Lili,Qian, Yuhai,et al. Effects of High Temperature Oxidation on Mechanical Properties of Ti3AlC2[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2017,33(6):596-602.
APA Li, Xichao,Zheng, Lili,Qian, Yuhai,Xu, Jingjun,Li, Meishuan,&Li, MS .(2017).Effects of High Temperature Oxidation on Mechanical Properties of Ti3AlC2.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,33(6),596-602.
MLA Li, Xichao,et al."Effects of High Temperature Oxidation on Mechanical Properties of Ti3AlC2".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 33.6(2017):596-602.
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