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Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3
Cai, Ping; He, Qiming; Yang, Lihui; Huang, Zhengren; Liu, Xuejian; Yin, Jie; Huang, Yihua
2019-06-01
Source PublicationCERAMICS INTERNATIONAL
ISSN0272-8842
Volume45Issue:8Pages:9799
SubtypeArticle
Abstract(Nb1-xTax)(4)AlC3 (x = 0-0.5) ceramics were prepared by the hot press sintering method. The XRD results show that the second phase (Nb1-xTax)C is formed when the Ta content increases to 25 mol%. The SEM micrographs show that (Nb1-xTax)C has a core/rim structure, whose formation mechanism was also investigated. Substituting some Ta for Nb can significantly improve the mechanical properties of Nb4AlC3. (Nb0.75Ta0.25)(4)AlC3 exhibits an excellent fracture toughness of 8.3 +/- 0.3 MPa m(1/2) at room temperature (RT). The highest Young's modulus (349 +/- 16 GPa) and Vickers hardness (4.5 +/- 0.3 GPa) at RT are exhibited by the (Nb0.5Ta0.5)(4)AlC3 sample, which correlate to increases of 18% and 80%, respectively, compared with those of Nb4AlC3. The flexural strengths of (Nb0.5Ta0.5)(4)AlC3 are 439 +/- 18 MPa at RT and 344 +/- 22 MPa at 1100 degrees C, which correlate to increases of 27% and 45%, respectively, compared with those of Nb4AlC3. The solid solution of Ta and the formation of (Nb1-xTax)C are beneficial to the strengthening of Nb4AlC3. The coefficient of thermal expansion (CTE) increases slightly from 7.08 x 10(-6) K-1 for Nb4AlC3 to 7.24 x 10(-6) K-1 for (Nb0.75Ta0.25)(4)AlC3 at 25-1400 degrees C. The thermal conductivity of (Nb0.75Ta0.25)(4)AlC3 (28.4-29.8 W/m.K) is higher than that of Nb4AlC3 (18.1-21.2 W/m.K) over the whole test range (25-1000 degrees C). Owing to their excellent mechanical and thermal properties, Ta-doped Nb4AlC3 ceramics have good potential as structural materials.
KeywordTa-doped Nb4AlC3 Solid solution Phase composition Mechanical and thermal properties Microstructural evolution
DOI10.1016/j.ceramint.2019.02.017
Language英语
WOS Research AreaMaterials Science
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27091
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Cai, Ping,He, Qiming,Yang, Lihui,et al. Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3[J]. CERAMICS INTERNATIONAL,2019,45(8):9799.
APA Cai, Ping.,He, Qiming.,Yang, Lihui.,Huang, Zhengren.,Liu, Xuejian.,...&Huang, Yihua.(2019).Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3.CERAMICS INTERNATIONAL,45(8),9799.
MLA Cai, Ping,et al."Mechanical and thermal properties and microstructural evolution of Ta-doped Nb4AlC3".CERAMICS INTERNATIONAL 45.8(2019):9799.
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