New TiAl alloys, containing 45 at.% Al, 7 at.% Nb, x at.% W, and 0.15 at.% B (x = 0, 0.2, 0.4, and 0.7) were prepared by arc melting and drop casting consequently. Using optical microscopy, scanning electron microscopy (SEM), and electron superprobe technologies, the effects of tungsten on the microstructural evolution of the TiAl alloys, including the colony size and lamellar spacing, were analyzed. It was found that cellular structures and dendrites were formed in the as-cast TiAl alloys, and heavy metals, such as niobium and tungsten, tend to segregate strongly at the interface of the cellular structures and dendrites. Trace tungsten can effectively impede the grain growth and narrow the interlamellar spacing. 0.4 at.% tungsten is more effective in refining the microstructure of the TiAl alloys.
参考文献
| [1] | Kim Y W .Intermetallics alloys based on gamma titanium aluminide[J].JOM-Journal of the Minerals Metals and Materials Society,1989,41(07):24. |
| [2] | Kim Y W;Dimiduk D M .Progress in the understanding of gamma titanium aluminide[J].JOM-Journal of the Minerals Metals and Materials Society,1991,43(08):40. |
| [3] | Beddoes J C;Wallace W;de Malherbe M C .Technology for titanium aluminides for aerospace applications[J].Materials and Manufacturing Processes,1992,7:527. |
| [4] | Kim Y W .Gamma titanium aluminide:their status and future[J].JOM-Journal of the Minerals Metals and Materials Society,1995,47(07):39. |
| [5] | A. M. Hodge;L. M. Hsiung;T. G. Nieh .Creep of nearly lamellar TiAl alloy containing W[J].Scripta materialia,2004(5):411-415. |
| [6] | Yoshihara M;Kim Y W .Oxidation behavior of gamma alloys designed for high temperature applications[J].Intermetallics,2005,13(09):952. |
| [7] | Huang S C;Hall E L .On the temperature dependence of yield stress in TiAl base alloys[J].Scripta Metallurgica et Materialia,1991,25(08):1805. |
| [8] | Mitao S;Tsuyama S;Minakawa K .Effects of microstructure on the mechanical properties and fracture of γ-base titanium aluminides[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1991,143:51. |
| [9] | Gnanamoorthy R;Mutoh Y;Masahashi N;Mizuhara Y .Fracture toughness of gamma-base titanium aluminides[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1995,26:305. |
| [10] | Nobuki M;Vanderschueren D;Nakamura M .High temperature mechanical properties of vanadium alloyed γ base titanium-aluminides[J].Acta Metallurgica Et Materialia,1994,42:2623. |
| [11] | Maziasz P J;Ramanujan R V;Liu C T;Wright J.L .Effect of B and W alloying additions on the formation and stability of lamellar structures in two-phase γ-TiAl[J].Intermetallics,1997,5(02):83. |
| [12] | Beddoes J;Zhao L;Wallace W .High temperature compression behaviour of near γ-titanium aluminides containing additions of chromium of tungsten[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1994,184:L11. |
| [13] | Shida Y;Anada H .Role of W,Mo,Nb and Si on oxidation of TiAl in air at high temperature[J].Materials Transactions-Japan Institute of Metals,1994,35(09):623. |
| [14] | Larson D J;Liu C T;Miller M K .Tungsten segregation in α2 + γ Titanium Aluminides[J].Intermetallics,1997,5(07):497. |
| [15] | Chen X Y;Wan X J;Shen J N .Effect of alloy element Nb on high temperature oxidation behavior of TiAl alloy[J].Corros Prot,2002,22(02):69. |
| [16] | Kim HY.;Hong SH.;Sohn WH. .High temperature deformation of Ti-(46-48)A1-2W intermetallic compounds[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):216-225. |
| [17] | Recina V;Karlsson B .Tensile properties and microstructure of Ti-48Al-2W-0.5Si γ-titanium Aluminide at temperature between room temperature and 800℃[J].Materials Science and Technology,1999,15(01):57. |
| [18] | Martin P L;Rhodes C G;McQuary P A.Thermomechanical processing effects on microstructure in alloys based on γ-TiAl[A].Warrendale,PA,TMS,1993:177. |
| [19] | Liu C T;Maziasz P J;Larson D J.Effect of B and W Addition on microstructures and mechanical properties of dual phase lamellar TiAl alloys[A].Warrendale,PA,TMS,1998:179. |
| [20] | Liu Z C;Kim Y W;Li S J;Zhang W.J,Lin J.P, Chen G.L .Effect of Nb and Al on high temperature strength of γ-TiAl[J].J Nonferrous Met Soc China,2000,10(04):470. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%