用电子探针对Ti-45Al-7Nb-0.15B-0.4W的铸态和经过热处理之后的显微组织进行了观察和分析,并分析了热处理工艺对Ti-45Al-7Nb-0.15B-0.4W显微组织的影响.结果发现:Ti-45Al-7Nb-0.15B-0.4W的铸态组织经过热等静压和均匀化处理后,其晶团尺寸减小,层片组织更为完整;Ti-45Al-7Nb-0.15B-0.4W合金的α相转变温度为(1 290±5)℃;Ti-45Al-7Nb-0.15B-0.4W合金在超过1 295℃的温度进行热处理时,其显微组织由近层片组织转变为全层片组织.经过热等静压和均匀化处理后Ti-45Al-7Nb-0.15B-0.4W合金的基本形貌为初生γ相+层片状晶团,有β相析出,其形貌为针状、点状、颗粒状.
参考文献
| [1] | Liu C T .Recent advances in ordered intermetallics[J].Materials Chemistry and Physics,1995,42(02):77-86. |
| [2] | F. Appel;M. Oehring .Novel design concepts for gamma-base titanium aluminide alloys[J].Intermetallics,2000(9/11):1283-1312. |
| [3] | Rainer Gerling;Arno Bartels;Helmut Clemens .Structural characterization and tensile properties of a high niobium containing gamma TiAl sheet obtained by powder metallurgical processing[J].Intermetallics,2004(3):275-280. |
| [4] | D. Hu .Effect of boron addition on tensile ductility in lamellar TiAl alloys[J].Intermetallics,2002(9):851-858. |
| [5] | T.T. Cheng .The mechanism of grain refinement in TiAl alloys by boron addition －－an alternative hypothesis[J].Intermetallics,2000(1):29-38. |
| [6] | Y. Mizuhara;K. Hashimoto;N. Masahashi .Microstructure and phase stability of TiAl-W ternary alloy[J].Intermetallics,2003(8):807-816. |
| [7] | R. Yu;L.L He;Z.Y. Cheng .B2 precipitates and distribution of W in a Ti-47Al-2W-0.5Si alloy[J].Intermetallics,2002(7):661-665. |
| [8] | Zhang G;Blenkinsop P A;Wise M L H .Phase transformations in HIPped Ti-48Al-2Mn-2Nb powder during heat-treatments[J].Intermetallics,1996,4(06):447-455. |
| [9] | D. Srivastava;I.T.H. Chang;M.H. Loretto .The effect of process parameters and heat treatment on the microstructure of direct laser fabricated TiAl alloy samples[J].Intermetallics,2001(12):1003-1013. |
| [10] | 刘自成,李书江,林均品,陈国良.热处理工艺对Ti46Al8.5Nb0.2W合金层片组织结构参数的影响[J].金属热处理学报,2000(01):1-5. |
| [11] | 郑瑞廷,张永刚,陈昌麒.循环热处理工艺对于双态复相γ-TiAl基合金室温拉伸性能的影响[J].稀有金属材料与工程,2002(06):472-475. |
| [12] | Yong Wang;J. N. Wang;Qiangfei Xia;Jie Yang .Microstructure refinement of a TiAl alloy by beat treatment[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):102-106. |
| [13] | J.N.Wang;K.Xie .Refining of coarse lamellar microstructure of TiAl alloys by rapid heat treatment[J].Intermetallics,2000(5/6):545-548. |
| [14] | Shida Y;Anada H .Role of W, Mo, Nb and Si on oxidation of TiAl in air at high temperature[J].Materials Transactions,1994,35(09):623-631. |
| [15] | Larson D J;Liu C T;Miller M K .Tungsten segregation in α2+γ titanium aluminides[J].Intermetallics,1997,5(07):497-500. |
| [16] | Wang JN.;Yang J.;Xia QF.;Wang Y. .On the grain size refinement of TiAl alloys by cyclic heat treatment[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(0):118-123. |
| [17] | Prasad U.;Xu Q.;Chaturvedi MC. .Effect of cooling rate and manganese concentration on phase transformation in Ti-45 at.% Al based alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(0):906-913. |
| [18] | Yua R;Hea L L;Chengb Z Y et al.P2 precipitates and distribution of W in a Ti-47Al-2W-0. 5Si alloy[J].Intermetallics,2002,10:661-665. |
| [19] | 郑运荣,汪小平.TiAl-Cr合金中的β2相[J].中国有色金属学报,1998(01):1-6. |
| [20] | 李臻熙,曹春晓.TiAl 合金中的γ→α析出转变行为[J].中国有色金属学报,2003(04):827-834. |
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