Oxidation behavior of TiAl-X (X = Cr, V, Si, Mo or Nb) intermetallics at elevated temperature

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00327-R· OSTI ID:237834

Kim, B G ^[1]; Kim, G M ^[2]; Kim, C J ^[3]

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1. Korea Atomic Energy Research Inst., Taejon (Korea, Republic of)
2. Chungnam National Univ., Taejon (Korea, Republic of). Dept. of Materials Engineering
3. Korea Research Inst. of Standards and Science, Taejon (Korea, Republic of)

Oxidation behavior of TiAl intermetallic compounds with the additions of Cr, V, Si, Mo, or Nb was investigated at 900--1,100 C under the atmospheric environment. The reaction products were examined by XRD and SEM equipped with WDX. The weight gain by continuous oxidation increased with the addition of Cr or V, but there was less weight gain when Mo, Si or Nb was added individually. Thus, it is concluded that the addition of Cr or V did not improve the oxidation resistance, whereas the addition of Si, Mo or Nb improved it. Nb strengthened the tendency to form Al{sub 2}O{sub 3} in the early stage of oxidation, due to the formation of the continuous Al{sub 2}O{sub 3} and dense TiO{sub 2}+Al{sub 2}O{sub 3} layers. According to the Pt-marker test of TiAl-5wt%Nb, oxides were formed mainly by inward diffusion of oxygen. Upon thermal cyclic oxidation at 900 C, it was shown that the addition of Cr or Nb improved the adherence of oxide scale to the substrate.

• OSTI ID: 237834
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 7 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
CHROMIUM ALLOYS
DIFFUSION
EARTH ATMOSPHERE
INTERMETALLIC COMPOUNDS
MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
OXIDATION
SCANNING ELECTRON MICROSCOPY
SILICON ALLOYS
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
VANADIUM ALLOYS
WEIGHT MEASUREMENT
X-RAY DIFFRACTION