采用电磁悬浮熔炼的深过冷凝固技术实现了Ti-48( at％) Al合金的深过冷,获得的最大过冷度为295K.采用红外测温仪记录实验过程的温度变化数据,OM技术观察不同过冷度下凝固合金的显微组织,结合深过冷凝固过程中的再辉行为分析了该合金的非平衡凝固路径.运用负熵模型、经典形核理论及瞬态形核理论,研究了Ti-48( at％)Al包晶合金中初生相与次生相的形核与过冷度之间的关系.通过对该合金熔体的β(bcc)相和α(hcp)相的临界形核功、稳态形核率、形核孕育时间和瞬态形核率的计算,并结合实验结果对β,α两相的形核进行了综合分析.结果表明,在～10K/s的较低冷速情况下,在整个过冷度(≤295K)范围内B(bcc)相总能作为初生相首先形核.
参考文献
| [1] | LAPIN J .TiAl-based alloys:present status and future perspectives[J].Hradec nad Moravicí,2009,19/21(05):1-12. |
| [2] | 李宝辉,孔凡涛,陈玉勇,陈子勇,张军伟.TiAl金属间化合物的合金设计及研究现状[J].航空材料学报,2006(02):72-78. |
| [3] | 刘志光,柴丽华,陈玉勇,孔凡涛.快速凝固TiAl化合物的研究进展[J].金属学报,2008(05):569-573. |
| [4] | WANG H W;ZHU D D;ZOU C M et al.Microstructure and nanohardness of Ti-48% Al alloy prepared by rapid solidification under different cooling rates[J].Transactions of Nonferrous Metals Society of China,2011,21(02):328-332. |
| [5] | H.P.Qu;H.M.Wang .Microstructure and mechanical properties of laser melting deposited γ-TiAl intermetallic alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):187-194. |
| [6] | Liu YC;Lan F;Yang GC;Zhou YH .Microstructural evolution of rapidly solidified Ti-Al peritectic alloy[J].Journal of Crystal Growth,2004(1/2):313-318. |
| [7] | ANDERSON C D;HOFMEISITER W H;BAYUZICK R J .Solidification kinetics and metastable phase formation in binary Ti-Al[J].Metallurgical Transaction (A),1992,23(10):2699-2714. |
| [8] | 刘永长 .快速凝固Ti-Al包晶合金的相选择与控制[D].西北工业大学,2000. |
| [9] | L(O)SER W;LINDEBKREUZ H G;HERMANN R et al.Recalescence behaviour of binary Ti-Al and ternary Ti-Al-Nb undercooled melts[J].Materials Science and Engineering A:Structural Materials:Properties Microstructure and Processing,2005,398:413-414. |
| [10] | O. Shuleshova;T.G. Woodcock;H.-G. Lindenkreuz .Metastable phase formation in Ti-Al-Nb undercooled melts[J].Acta materialia,2007(26):681-689. |
| [11] | Hartmann H;Galenko PK;Holland-Moritz D;Kolbe M;Herlach DM;Shuleshova O .Nonequilibrium solidification in undercooled Ti45Al55 melts[J].Journal of Applied Physics,2008(7 Pt.1):73509-1-73509-9-0. |
| [12] | 李明军;薛玉芳;宋广生 等.深过冷Fe-30at% Co合金的组织演化及亚稳相形成[J].金属学报,1999,35(05):517-522. |
| [13] | 刘宁,杨根仓,刘峰,陈豫增,杨长林,周尧和.深过冷Fe-Co合金的凝固规律[J].金属学报,2007(05):449-453. |
| [14] | HERLACH D M;FEUERBACHER B;S CHLEIP E .Phase seeding in the solidification of an undercooled melt[J].Materials Science and Engineering A:Structural Materials:Properties Microstructure and Processing,1999,133:795-798. |
| [15] | 陈豫增 .Fe-Ni包晶合金的非平衡凝固与相选择行为[D].西安:西北工业大学,2008. |
| [16] | OKAMOTO H .Al-Ti (aluminum-titanium)[J].Journal of Phase Equilibria,2000,14(01):120-121. |
| [17] | WANG H F;LIU F;CHEN Z et al.Analysis of non-equilibrium dendrite growth in bulk undercooled alloy melt;model and application[J].Acta Materialia,2007,55(02):497-506. |
| [18] | Fan, J.;Li, X.;Su, Y.;Chen, R.;Guo, J.;Fu, H. .Directional solidification of Ti-49 at.%Al alloy[J].Applied physics, A. Materials science & processing,2011(1):239-248. |
| [19] | CHRISTIAN J W.The theory of transformation in metals and alloys[M].Oxford:pergamon Press,1965:418-437. |
| [20] | ZHOU K;WANG H P;CHANG J et al.Specific heat measurement of stable and metastable liquid Ti-Al alloys[J].Applied Physics (A),2010,103(01):136. |
| [21] | WANG N;WEI B B .Thermodynamic properties of highly undercooled liquid TiAl alloy[J].Applied Physics Letters,2002,80(19):3516. |
| [22] | 傅恒志,李新中,刘畅,苏彦庆,李双明,郭景杰.Ti-Al包晶合金定向凝固及组织选择[J].中国有色金属学报,2005(04):495-505. |
| [23] | HERLACH D M .Non-equilibrium solidification of undercooled metallic melts[J].Materials Science and Engineering A:Structural Materials:Properties Microstructure and Processing,1994,12(4/5):177-272. |
| [24] | SPAEPEN F;MEYER R B .The surface tension in a structural model for the solid-liquid interface[J].Scripta Metallurgica,1976,10(03):257-263. |
| [25] | TUMBULL D .Under what conditions can a glass be formed[J].Contemporary Physics,1969,10(05):473-488. |
| [26] | THOMPSON C V;SPAEPEN F .Homogeneous crystal nucleation in binary metallic melts[J].Acta Metallurgica,1983,31(12):2021-2027. |
| [27] | SHAO G;TSKIROPOULOS P .Prediction of phase selection in rapid solidification using time dependent nucleation theory[J].Acta Metallurgica Et Materialia,1994,42(09):2937-2942. |
| [28] | ZELDVICH Y B .On the theory of new phase formation:cavitation[J].Acta Physicochimica URSS,1943,18:1-12. |
| [29] | HALL E L;HUANG S C .Microstructures of rapidly-solidified binary TiAl alloys[J].Acta Metallurgica Et Materialia,1990,38(04):539-549. |
| [30] | WILLNECKER R;GOKLER G P;WILDE G .Appearance of a hypercooled liquid requid region for completely miscible alloys[J].Materials Science and Engineering A:Structural Materials:Properties Microstructure and Processing,1997,226/228:439-442. |
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