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| EFFECTS OF ELEMENT Si ON OXIDATION RESISTANCE OF TiAl ALLOYS |
| DONG Limin; CUI Yuyou; YANG Rui; WANG Fuhui |
| Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
DONG Limin; CUI Yuyou; YANG Rui; WANG Fuhui. EFFECTS OF ELEMENT Si ON OXIDATION RESISTANCE OF TiAl ALLOYS. Acta Metall Sin, 2004, 40(4): 383-387 .
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Abstract The effects of alloying element Si on oxidation resistance of several γ--TiAl based alloys containing different Nb contents have been studied. The results reveal that the lower the Nb content of the alloy, the more obvious the beneficial effect of Si. The improvement of oxidation resistance by Si is mainly attributed to promoting the formation
of continuous and dense Al2O3 layers in the binary alloy. In addition, more homogeneous and finer oxidation products appear on the surface of higher Si--bearing alloys than on lower Si--bearing alloys, leading
to further improvement of oxidation resistance
in Nb--containing alloys. As a result, the parabolic rate constant decreases
with increasing Si content. Isothermal oxidation experiment, X--ray
diffraction (XRD) and scanning electron microscopy (SEM) analysis of the
oxidation products are presented.
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Received: 18 April 2003
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