The influence of the addition of 2.3 at.-% Y and of 0.8 at.-% Zr + 0.2 at.-% Y on the properties of TiAl43Nb4Mo1B0.1 (TNM-B1) titanium aluminide alloy is investigated. Energy-dispersive X-ray spectroscopy analysis shows that the Y content of the β, γ, and α2 phases is low, and nearly all of the Y is in the Al2Y phase. The Zr content in the alloy phases is the same as that in alloy. Tensile tests show that Y addition decreases tensile strength and elongation, but only minor effects on these properties are observed after the addition of Zr and Y. It is shown that the addition of Y leads to a decrease in the heat resistance of TiAl43Nb4Mo1B0.1 alloy at 900°C.
SchwaighoferEClemensHMayerSMicrostructural design and mechanical properties of a cast and heat-treated intermetallic multi-phase γ-TiAl based alloy. Intermetallics. 2014; 44:128–140. doi: 10.1016/j.intermet.2013.09.010
2.
ClemensHSmarslyW.Lightweight intermetallic titanium aluminides – status of research and development. Adv Mat Res. 2011; 278:551–556.
3.
AppelFWagnerR.Microstructure and deformation of two-phase γ-titanium aluminides. Mat Sci Eng R. 1998; 22(5):187–268. doi: 10.1016/S0927-796X(97)00018-1
4.
MayerSSailerCSchmoelzerTOn phase equilibria and phase transformations in β/γ-TiAl alloys – a short review. BHM Berg-und Hüttenmännische Monatshefte. 2011; 156(11):438–442. doi: 10.1007/s00501-011-0033-0
5.
HuangZW.Ordered ω phases in a 4Zr–4Nb-containing TiAl-based alloy. Acta Mater. 2008; 56(8):1689–1700. doi: 10.1016/j.actamat.2007.12.013
6.
HashimotoKDoiHKasaharaKEffects of additional elements on mechanical properties of TiAl-base alloys. J Jpn I Met Mater. 1988; 52(11):1159–1166.
7.
ChengTTLorettoMH.The decomposition of the beta phase in Ti–44Al–8Nb and Ti–44Al–4Nb–4Zr–0.2Si alloys. Acta Mater. 1998; 46(13):4801–4819. doi: 10.1016/S1359-6454(98)00113-X
8.
BelovNAAkopyanTKBelovVDThe effect of Cr and Zr on the structure and phase composition of TNM gamma titanium aluminide alloy. Intermetallics. 2017; 84:121–129. doi: 10.1016/j.intermet.2017.01.006
9.
ZhuBXueXKouHEffect of thermal stresses on the microstructure of the continuous cooling TiAl alloys. Intermetallics. 2017; 90:152–158. doi: 10.1016/j.intermet.2017.07.013
10.
XuWHuangKWuSInfluence of Mo content on microstructure and mechanical properties of β-containing TiAl alloy. T Nonferr Metal Soc China. 2017; 27(4):820–828. doi: 10.1016/S1003-6326(17)60094-3
11.
WuYHwangSK.Microstructural refinement and improvement of mechanical properties and oxidation resistance in EPM TiAl-based intermetallics with Y addition. Acta Mater. 2002; 50(6):1479–1493. doi: 10.1016/S1359-6454(02)00006-X
12.
StringerJ.The reactive element effect in high-temperature corrosion. Mater Sci Eng A Struct. 1989; 120–121:129–137. doi: 10.1016/0921-5093(89)90730-2
13.
KongFTChenYYLiBH.Influence of Y on the high temperature deformability of TiAl alloys. Mater Sci Eng A Struct. 2009; 499(1–2):53–57. doi: 10.1016/j.msea.2007.09.093
ClemensHWallgramWKremmerSDesign of novel β-solidifying TiAl alloys with adjustable β/B2-phase fraction and excellent hot-workability. Adv Eng Mater. 2008; 10(8):707–713. doi: 10.1002/adem.200800164
16.
AnderssonJOHelanderTHöglundLThermo-Calc and DICTRA, Computational tools for materials science. CALPHAD. 2002; 26:273–312. doi: 10.1016/S0364-5916(02)00037-8
17.
ThermoTech TiAl-based alloys database, Version 1.0.
18.
WuX.Review of alloy and process development of TiAl alloys. Intermetallics. 2006; 14(10–11):1114–1122. doi: 10.1016/j.intermet.2005.10.019
19.
AppelFClemensHFischerFD.Modeling concepts for intermetallic titanium aluminides. Prog Mater Sci. 2016; 81:55–124. doi: 10.1016/j.pmatsci.2016.01.001
20.
SokolovskyVSStepanovNDZherebtsovSVHot deformation behavior and processing maps of B and Gd containing β-solidified TiAl based alloy. Intermetallics. 2018; 94:138–151. doi: 10.1016/j.intermet.2018.01.004
21.
NonakaKKawabataTNakajimaHEffects of Be additions on microstructures of TiAl intermetallic compounds. Mater Trans. 1997; 38(12):1047–1056. doi: 10.2320/matertrans1989.38.1047
22.
YaoTLiuYLiuBInfluence of carburization on oxidation behavior of high Nb contained TiAl alloy. Surf Coat Tech. 2015; 277:210–215. doi: 10.1016/j.surfcoat.2015.07.058
23.
ZhangZGTengXMaoYLImprovement of oxidation resistance of γ-TiAl at 900 and 1000°C through hot-dip aluminizing. Oxid Met. 2010; 73(3–4):455–466. doi: 10.1007/s11085-009-9187-5
24.
MassetPJSchützeM.Oxidation tests with untreated and F-treated TNBV5 alloys. ECS Trans. 2010; 25(25):45–56. doi: 10.1149/1.3315795
25.
DettenwangerFSchumannERühleMMicrostructural study of oxidized γ-TiAl. Oxid Met. 1998; 50(3/4):269–307. doi: 10.1023/A:1018892422121
26.
ChinnappanR.Thermodynamic stability of oxide phases of Fe–Cr based ODS steels via quantum mechanical calculations. Calphad. 2014; 45:188–193. doi: 10.1016/j.calphad.2013.12.008
