J Mater Sci Technol ›› 1994, Vol. 10 ›› Issue (3): 170-174.

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Mechanism and Kinetics of Phase Transformation in Two-phase TiAl-based Alloys

Shiming HAO+ and Wen tao WU(Dept. of Mater. Sci., Northeastern University, Shenyang, 110006, China)Chuanxi HAN(Northwest Institute for Nonferrous Metal Research, Bao ji, 721014, China)   

  • Received:1994-05-28 Revised:1994-05-28 Online:1994-05-28 Published:2009-10-10

Abstract: The aged and quenched microstructures of both alloys, Ti-42at-%Al and Ti-45at -%Al,homogenized in the disordered single phase field. were investigated And the results show that the quinched microstructure is a supersaturated single phase of ordered 22. When the supersaturated phase is aged in the two phase range at 1273 and 1373 K, it will transform to a lamellar microstructure of γ+α2. with a discontinuous decomposition mechanism in Ti-42at-%Al alloy and a semicontinuous decomposition mechanism in T1-45at-%Al alloy. With the methods of quantitative metallograph examination and X-ray diffraction analysis. the relationship between the amount of γ, phase precipitation and the time of isothermal transformation is agreed