Influences of yttrium on adhesion of oxide scale of Fe-Cr-Al alloy
Xin, L; Li, MS; Zhou, LJ; Wang, FH; Li, TF
AbstractThe 1100 degreesC isothermal oxidation behavior of Fe-23Cr-5Al alloy modified by yttrium addition was studied by means of thermogravimetric analysis, scanning electron microscopy and energy dispersive X-ray analysis. Yttrium was added to this alloy in the forms of metallic addition, yttrium oxide and ion implant. Cracking and spalling occurred on the convoluted scale formed on Y-free alloy and exposed the substrate. A flat dense scale without spallation was formed on the yttrium alloying addition or yttrium oxide dispersion alloy. The scale adhesion was also improved by 1x10(17)Y(+)/cm(2)-implantation. The results indicate the convoluted morphology of the scale on Fe-23Cr-5Al-0.21Ti alloy is related to the growth mechanism of the alumina scale, and the spallation of the scale is related to sulfur segregation at the scale/alloy interface. The main reason that the adhesion of alumina scale is improved by yttrium addition lies in the following. Yttrium is liable to form a stable yttrium sulfide with sulfur in the alloy and prevent sulfur interface from segregation. Another reason is that the growth mechanism of alumina scale is changed by yttrium addition.
Keywordrare earths yttrium Fe-Cr-Al alloy isothermal oxidation
Indexed BySCI
WOS Research AreaChemistry
WOS SubjectChemistry, Applied
WOS IDWOS:000168494900008
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Inst Corros & Protect Met, Corros Sci Lab, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Xin, L,Li, MS,Zhou, LJ,et al. Influences of yttrium on adhesion of oxide scale of Fe-Cr-Al alloy[J]. JOURNAL OF RARE EARTHS,2001,19(2):117-121.
APA Xin, L,Li, MS,Zhou, LJ,Wang, FH,&Li, TF.(2001).Influences of yttrium on adhesion of oxide scale of Fe-Cr-Al alloy.JOURNAL OF RARE EARTHS,19(2),117-121.
MLA Xin, L,et al."Influences of yttrium on adhesion of oxide scale of Fe-Cr-Al alloy".JOURNAL OF RARE EARTHS 19.2(2001):117-121.
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