Control of microstructure and fracture toughness improvement of NbSi2/MoSi2 duplex lamellar silicides by TaC particles dispersion

SCRIPTA MATERIALIA

卷:82

Article

Hagihara, Koji¹  Fushiki, Tatsuya¹  Nakano, Takayoshi² 

[1] Osaka Univ, Grad Sch Engn, Dept Adapt Machine Syst, Suita, Osaka 5650871, Japan

[2] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, Suita, Osaka 5650871, Japan

关键词: Transition-metal suicides;    Carbides;    Toughness;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2014.03.021

来源: Elsevier

【 摘 要 】

The floating-zone melting method enabled the dispersion of TaC particles in a C40-(Mo0.85Nb0.15)Si-2 single crystal. By annealing the C40 crystal, coarse C11(b) phases were formed around the TaC particles and the precipitation of the D8(8)-(Mo,Nb,Ta)(5)Si3C phase was also induced, in addition to the development of a C40/C11(b) lamellar microstructure. Such a microstructure containing TaC particles led to a reduction in the orientation dependence of the fracture toughness of duplex silicide crystals. (c) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free