INTERFACIAL CHARACTER OF PRIMARY α_2/γLAMELLAE FOR γ-TiAl-BASED(α_2+γ) TWO-PHASE AllOY

Acta Metall Sin

1998, Vol. 34

Issue (12): 1279-1283 DOI:

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INTERFACIAL CHARACTER OF PRIMARY α_2/γLAMELLAE FOR γ-TiAl-BASED(α_2+γ) TWO-PHASE AllOY

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QIN Gaowu; HAO Shiming(School of Material & Metallurgy; Northeastern University; Shenyang 110006)SONG DanMaterials Test Center; Northeastern University; Shenyang 110006)Correspondent:QIN Gaowu; Tel: (oB4)-2389000- : (o4)23906316;E-mail: gwqin@mail neu.edu cnManuscript received 1997-12-16; in revised form 1998-04-02. INTERFACIAL CHARACTER OF PRIMARY α_2/γLAMELLAE FOR γ-TiAl-BASED(α_2+γ) TWO-PHASE AllOY. Acta Metall Sin, 1998, 34(12): 1279-1283.

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Abstract The interfacial character and formation of primary α2/γ lamellae in the or orsupersaturated α2 matrix for γ-TiAl-based (α2+γ) two-phase alloy were investigated by opticalmicroscopy and TEM. The formation of primary α2/γ lamellae is through either α-α2γorα- α+γ -α2+γ transformation. Theγ lamella nucleates at grain boundary and growsthrough the ledge mechanism controlled by volume diffusion process. The growth velocity of 7lamellae along the longitudinal direction in the matriX is about (1.0 - 3.33) x 10(-7) m/s. Theprimary or2/7 interface was determined to be sendcoherent, and the α2/γ interfacial energy wasestimated to be about 0.274 J/m2.

Key words: ledge mechanism interfacial dislocation TiAl alloy primary α2/γ lamellae misfit

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