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In situ reaction and solid solution induced hardening in (Ti,Zr)B 2 ‐(Zr,Ti)C composites
Author(s) -
Huo Sijia,
Wang Yujin,
Kong Qingyi,
Chen Lei,
Yao Mianyi,
Gu Hui,
Ouyang Jiahu,
Fu Yudong,
Zhou Yu
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17355
Subject(s) - materials science , solid solution strengthening , solid solution , microstructure , fracture toughness , hardening (computing) , composite material , indentation , sintering , composite number , ceramic , hot pressing , zirconium , metallurgy , layer (electronics)
(Ti,Zr)B 2 ‐ (Zr,Ti)C ceramics were synthesized by reactive hot‐pressing and solid solution coupling effect using ZrB 2 and TiC powders as starting materials. Effects of sintering temperature on phase relations, microstructure and mechanical properties were reported. The equimolar ZrB 2 and TiC reactants ensured a complete in situ reaction to form (Ti,Zr)B 2 and (Zr,Ti)C solid solutions. The (Ti,Zr)B 2 ‐ (Zr,Ti)C composite sintered at 1750°C was fully densified, and exhibited a high hardness of 29.1 GPa due to fine‐grain hardening and solid solution hardening. The optimized comprehensive mechanical properties such as a hardness of 27.9 GPa, a strength of 705 MPa and an indentation fracture toughness of 5.3 MPa m 1/2 were achieved in (Ti,Zr)B 2 ‐ (Zr,Ti)C composites sintered at 1800°C for 1 hour.