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Vol.36, No.4, 546 ~ 553, 1998
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| Title |
| Effect of Cr addition on the high temperature oxidation resistance of TiAl |
| 원재훈 , 김영직 , 안상우 , 이동복 Jae Hoon Won , Young Jig Kim , Sang Woo An , Dong Bok Lee |
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| Abstract |
| Alloys of TiAl+(0, 2, 6. 10%)Cr manufactured by a mechanical alloying- plasma active sintering method (MAPAS) were oxidized at 800. 900 and 1000℃ isothermally and cyclically in air up to 72 hrs. It was found that the oxidation resistance increased in the order of TiAl+2%Cr, pure TiAl, TiAl+6%Cr and TiAl+10%Cr. The increase in the oxidation rate of TiAl+2%Cr compared with pure TiAl is considered to be due to the doping effect of Cr₂O₃ dissolved in TiO₂, which increases the overall growth rate of scales formed. In contrast with this deleterious Cr effect in TiAl+2%Cr, the decrease in the oxidation rate of TiAl+(6, 10%)Cr compared with pure TiAl is considered to be due to the formation of a sufficient amount of Cr₂O₃ beyond the solubility limit in TiO₂. Chromic was mainly present inside the Al₂O₃ rich. TiO₂-deficient inner scale. |
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