OMEGA PHASE FORMATION IN Ti ALLOYS

Acta Metall Sin

1993, Vol. 29

Issue (2): 13-19 DOI:

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OMEGA PHASE FORMATION IN Ti ALLOYS

CUI Yuyou;LI Dong;WAN Xiaojing Institute of Metal Research; Academia Sinica; Shenyang

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CUI Yuyou;LI Dong;WAN Xiaojing Institute of Metal Research; Academia Sinica; Shenyang. OMEGA PHASE FORMATION IN Ti ALLOYS. Acta Metall Sin, 1993, 29(2): 13-19.

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Abstract The experimental results for three selected ternary alloy systems: Ti-Al-V,Ti-Al-Mo and Ti-Al-Nb show that the formation of ω-phase obeys the electron concentra-tion rule. The valence electron number is N_(Ti)=4(s~2d~2), N_v=5(s~2d~3), N_(Mo)=6(s~1d~5),N_(Nb)=5(s~1p~4) for the transition elements Ti, V, Mo, Nb, respectively, and N_(Al)=3(s~2p~1) for thenon-transition element Al. Furthermore, the electronegativities and atomic radii of the al-loying elements will still have some influence upon the ω-phase formation. Sythesizing thevalence electron number, electronegativity and atomatic radius of the alloying element, thecharacteristic value may be fixed at 4.223 in Ti alloy, and which may be expressed as4.223=∑N_if_i+0.310△x / x_(Ti)+0.551 △r / r_(Ti)

Key words: ω-phase Ti-alloy electron concentration electronegativity atomic radius

Received: 18 February 1993

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