Ternary alloying study of MoSi{sub 2}

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0164-4· OSTI ID:605815

Yi, D; Li, C ^[1]; Lai, Z ^[2]; Akselsen, O M; Ulvensoen, J H ^[3]

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1. Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Engineering Metals
2. Swedish Inst. of Production Engineering Research, Goeteborg (Sweden)
3. SINTEF Materials Technology, Trondheim (Norway)

Ternary alloying of MoSi{sub 2} with adding a series of transition elements was investigated by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS). Iron, Co, Ni, Cr, V, Ti, and Nb were chosen as alloying elements according to the AB{sub 2} structure map or the atomic size factor. The studied MoSi{sub 2} base alloys were prepared by the arc melting process from high-purity metals. The EDS analysis showed that Fe, Co, and Ni have no solid solubility in as-cast MoSi{sub 2}, while Cr, V, Ti, and Nb exhibit limited solid solubilities, which were determined to be 1.4 {+-} 0.7, 1.4 {+-} 0.4, 0.4 {+-} 0.1, and 0.8 {+-} 0.1. Microstructural characterization indicated that Mo-Si-M{sub VIII} (M{sub VIII} = Fe, Co, Ni) and Mo-Si-Cr alloys have a two-phase as-cast microstructure, i.e., MoSi{sub 2} matrix and the second-phase FeSi{sub 2}, CoSi, NiSi{sub 2}, and CrSi{sub 2}, respectively. In as-cast Mo-Si-V, Mo-Si-Ti, and Mo-Si-Nb alloys, besides MoSi{sub 2} and C40 phases, the third phases were observed, which have been identified to be (Mo, V){sub 5}Si{sub 3}, TiSi{sub 2}, and (Mo, Nb){sub 5}Si{sub 3}.

• Sponsoring Organization: USDOE
• OSTI ID: 605815
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 29; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
COBALT ALLOYS
FABRICATION
HEAT RESISTING ALLOYS
IRON ALLOYS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ALLOYS
PHASE STUDIES
SILICON ALLOYS
TERNARY ALLOY SYSTEMS
TITANIUM ALLOYS
VANADIUM ALLOYS