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Synthesis and Characterization of TiAl‐Based Nanocomposites by a Melt Electromagnetic Stirring Process
Author(s) -
Zhang Zhiyong,
Wang Yanli,
Xu Xiangjun,
Liang Yongfeng,
Zhang Laiqi,
Lin Junpin
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400557
Subject(s) - materials science , nanocomposite , lamellar structure , mixing (physics) , alloy , ceramic , wetting , nanoparticle , dissolution , composite material , vickers hardness test , precipitation , characterization (materials science) , particle (ecology) , liquid metal , metallurgy , chemical engineering , microstructure , nanotechnology , physics , oceanography , quantum mechanics , geology , meteorology , engineering
Ceramic nanoparticles were considered difficult to be dispersed well in liquid metal, especially in non‐reactive systems, by stir mixing methods due to their high specific surface energy. In this paper, an electromagnetic stirring process was exploited to disperse ceramic nanoparticles in an active TiAl alloy melt. The results indicate that finely dispersed nanoparticles can be obtained by stir mixing with the aid of reactive wetting. The presence of nanoparticles during solidification can refine the primary dendrites dramatically, which was primarily determined by the extent of particle pushing at the liquid–solid interface. Among the studied particles, TiC can refine the (γ + α 2 ) lamellar colonies, which is attributed to the dissolution of carbon and subsequent precipitation of Ti 2 AlC during L + β → β + α. The Vickers hardness of the nanocomposites as a function of stirring time was tested, and the Ti–45Al/TiC nanocomposite produced by 10 min stir mixing has the highest value, measuring 450 HV.