A transmission electron microscopy study of discontinuous precipitation in the high misfit system (Ti,Zr)C

被引：8
作者：
Babu, R. Prasath [1 ]
Ma, Taoran [1 ]
Hedstrom, Peter [1 ]
Odqvist, Joakim [1 ]
机构：
[1] KTH Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden
来源：
MATERIALS TODAY COMMUNICATIONS | 2020年 / 25卷 / 25期
关键词：
Transition metal carbides; Phase-separation; Discontinuous precipitation; Transmission electron microscopy; Interface strengthening; CELLULAR PRECIPITATION; PHASE-SEPARATION; MICROSTRUCTURE; DISLOCATIONS;
D O I：
10.1016/j.mtcomm.2020.101281
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
(Ti,Zr)C synthesized and aged in the immiscibility temperature range was investigated to improve understanding of the mechanism of phase separation, particularly the nucleation and early growth stages. The phase separation was observed to occur through discontinuous precipitation at grain boundaries. The nuclei were found enriched in titanium and associated with dislocations intersecting grain boundaries. During growth, zirconium enriched regions form subsequently and the semi-coherent interfaces of the Ti- and Zr-rich phases contain misfit dislocations. These observations suggest that dislocations play an important role for the nucleation and growth during discontinuous precipitation in the (Ti,Zr)C high misfit miscibility gap system.
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页数：6
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