Microstructure evolution of rare earth rich phase of rapidly-solidified (RS) TiAl based alloys was investigated. The two rapid-solidification techniques employed are melt-spinning technique (MS) and Hammer-and-Anvil technique (HA). MS ribbons and HA foils were obtained in the experiment. The results demonstrate that with the increasing of cooling rates of TiAl based alloys great changes are taken place in the microstructures of rare earth rich phase, from scattering mainly on grain boundaries of as-cast ingot to distributing homogeneously as very fine fibers or powders (nanometer grade) on the matrix. The fine paralleling second phase fibers in the HA foils are considered to be connected with γ/α2 lamellar colonies. Selected area electronic diffraction (SAED) patterns of the rare earth rich phase is in accordance with that of intermetallic AlCe.
参考文献
| [1] | Duwez P;WILLENS R H;KLEMENT W .Continuous series of metastable solid solutions in silver-copper alloys[J].Journal of Applied Physics,1960,31:1136-1137. |
| [2] | CHI C S;WHANG S H.Mechanical Behaviour of Rapidly Solidified Materials[M].TMS-AIME,Warrendale,PA,1986:231. |
| [3] | CHI C S;WHANG S H.Rapidly solidified metastable materials[A].,1984:353. |
| [4] | Lu Y Z;GIESSENBC;WHANG S H.Rapidly solidified alloys and their mechanical and magnetic properties[A].,1986:58-377. |
| [5] | Larsen D E .Investment-cast processing of XDTM near γ-titanium aluminides[J].Materials Science and Engineering,1991,144:45-49. |
| [6] | JIA Jun .Titanium alloys and melting techniques[J].Special Foundry and Non-Ferrous Alloys(in Chin),1998,4:6-11. |
| [7] | MA Xue-zhu .Research on microstructure and thermal stability of rapidly solidified TiAl-based alloys[D].Harbin:Harbin Institute of Technol,2001. |
| [8] | Uhlmann D R;CHALMERS B .Interaction between particles and a solid-liquid interface[J].Journal of Applied Physics,1964,35:2986-2992. |
| [9] | LI Ge-ping.Study on morphology, structure, formation and micro-mechanics behavior of rare earth-rich phases in high temperature titanium alloys[A].,1995:101-109. |
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