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In-situ formation of NbC in nanocrystalline Cu
Zeng, Wei1,4; Xie, Jingwen1; Zhou, Dengshan2,3; Fu, Zhiqiang4; Zhang, Deliang1,2,3; Lavernia, Enrique J.4
2017
Source PublicationJournal of Alloys and Compounds
ISSN09258388
Volume725Pages:334-341
AbstractWe report on an investigation of the in-situ formation of NbC nanoparticles in a Cu nanocrystalline matrix, paying particular attention to the role played by NbC on stabilizing and strengthening the matrix. The material was prepared by milling a Cu-5wt%Nb powder mixture with 1 wt% stearic acid for 36 h, followed by annealing of the milled powder at temperatures ranging from 400 to 1000 °C. Our results show that the NbC nucleates at an approximate temperature of 700 °C and that the associated enthalpy of formation and activation energy of NbC are approximately −0.8 kJ/mol and +312 kJ/mol, respectively. Moreover, the initial size of NbC particles formed at 700 °C was 8 nm, and showed limited coarsening (to 21 nm) even when annealed at 1000 °C for 1 h. With the presence of NbC, dislocation annihilation was impaired and grain boundary mobility was hindered, resulting in a dislocation density as high as 1014m−2following annealing at 1000 °C, and a grain size of 96 nm after annealing at 900 °C. The high thermal stability of NbC nanoparticles and the Cu matrix lead to appreciable strengthening of the composite powders as evidenced by a microhardness increase from 2128 MPa for the as-milled powder to 2665 MPa for the powder annealed at 700 °C for 1 h. © 2017 Elsevier B.V.
DOI10.1016/j.jallcom.2017.07.179
EI Accession Number20173003969361
EI KeywordsIndium compounds
EI Classification Number537.1 Heat Treatment Processes - 544.1 Copper - 641.1 Thermodynamics - 761 Nanotechnology - 933 Solid State Physics - 933.1 Crystalline Solids
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25729
Collection中国科学院上海硅酸盐研究所
Affiliation1.The State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China;
2.Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang; 110819, China;
3.Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang; 110819, China;
4.Department of Chemical Engineering & Materials Science, University of California, Irvine; CA; 92607, United States
Recommended Citation
GB/T 7714
Zeng, Wei,Xie, Jingwen,Zhou, Dengshan,et al. In-situ formation of NbC in nanocrystalline Cu[J]. Journal of Alloys and Compounds,2017,725:334-341.
APA Zeng, Wei,Xie, Jingwen,Zhou, Dengshan,Fu, Zhiqiang,Zhang, Deliang,&Lavernia, Enrique J..(2017).In-situ formation of NbC in nanocrystalline Cu.Journal of Alloys and Compounds,725,334-341.
MLA Zeng, Wei,et al."In-situ formation of NbC in nanocrystalline Cu".Journal of Alloys and Compounds 725(2017):334-341.
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