|
|
|
| High-Temperature Oxidation Resistance of High-Nb TiAl-Based Alloy |
| Yong Shen |
| 大连理工大学材料工程系 |
|
|
|
|
Abstract Four alloys with different morphology and microstructure were prepared by adding different amount of niobium to equal atom-ratio TiAl-based intermetallic compound. Interrupted oxidation behavior of the four as-cast high-Nb TiAl alloys and binary TiAl alloy at 1000℃ in static air was studied using oxidation mass gain analysis. The structure and component of the oxide scales were analyzed by XRD\SEM and EPMA. Results indicate that Nb enhances oxidation resistance of the alloy. The alloy Ti-42.8Al-14.2Nb consisting of main phase of γand α2 forms the protective oxide scale. However, excessive addition of Nb results the existence of Nb-enriched phase in the alloy and the formation of Nb2O3 in oxide scale, simultaneously the oxide scale structure becomes porous. It leads to the multi-layered scale, accelerating the spallation of the oxide.
|
|
Received: 29 November 2002
|
|
|
|
Corresponding Authors:
Yong Shen
E-mail: echo8848@263.net
|
[1]ZhangYG ,HanYF ,ChenGL ,etal.IntermetallicStructureMaterials[M].Beijing:NationalDefenseIndustryPress,2001(张永刚,韩雅芳,陈国良等.金属间化合物结构材料[M].北京:国防工业出版社,2001)
[2]DimidukDM .Gammatitaniumaluminidealloys-anassessmentwithinthecompetitionofaerospacestructuralmaterials[J].Mater.Sci.Eng.A ,1999,263:281-288
[3]ShidaY ,AnadaH .RoleofW ,Mo,NbandSionoxidationofTiAlinairathightemperature[J].Mater.Trans.JIM ,1994,35:623
[4]ZhuYC ,ZhangY ,etal.Theinfluenceofmagnetron-sputteredSiO2coatingsonthethecyclicoxidationbehaviorofγ-TiAlalloys[J].Mater.Trans.JIM ,2000,41(9):1118-1120
[5]HaanappelVAC ,ClemensH ,StroosnijderMF .ThehightemperatureoxidationbehaviorofhighandlowalloyedTiAl-basedintermetallics[J].Intermetallics,2002,10:293-305
[6]WangXJ ,ChangHW ,LeiMK .ThermodynamicaspectsofoxidationforNballoyingγ-TiAlintermetalliccompounds[J].ActaMetall.Sin.,2001,37(8):813-814(王兴军,常海威,雷明凯.Nb合金化γ-TiAl的氧化热力学理论分析[J].金属学报,2001,37(8):813-814)
[7]QuHL ,ZhouL ,etal.HightemperatureoxidationofTi-Al-Cralloys[J].Chin.J .RareMetals,2001,25(2):81(曲恒磊,周廉等.低铬合金化TiAl的高温氧化[J].稀有金属,2001,25(2):81)
[8]LiXY ,ZhangYK ,etal.OxidationmechanismofbinaryTi-Alalloysatelevatedtemperature[J].ActaMetall.Sin.,1997,33(9):964(李向阳,张永康等.二元Ti-Al合金高温氧化机理[J].金属学报,1997,33(9):964)
[9]StroosmijderMF ,ZhengN ,QuadakkersWJ,HofmanR ,GilA ,LanzaA .Theeffectofimplantedniobiumontheoxidationbehaviourofγ-TiAlbasedintermetallics[J].Oxid.Met.,1996,46(1/2):19-35 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
