PHASE BOUNDARY OF α_2 PRECIPITATION IN Ti-Al-La TERNARY SYSTEM

Acta Metall Sin

1988, Vol. 24

Issue (4): 288-290 DOI:

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PHASE BOUNDARY OF α_2 PRECIPITATION IN Ti-Al-La TERNARY SYSTEM

YANG Rui;LI Dong;WAN Xiaojing Institute of Metal Research; Academia Sinica; Shenyang

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YANG Rui;LI Dong;WAN Xiaojing Institute of Metal Research; Academia Sinica; Shenyang. PHASE BOUNDARY OF α_2 PRECIPITATION IN Ti-Al-La TERNARY SYSTEM. Acta Metall Sin, 1988, 24(4): 288-290.

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Abstract The phase boundary of α_2 precipitation at 600℃ in Ti-Al-La ternary systemhas been determined by TEM examination, which shows three kinds of phase regions, namelythe single α phase region, the transitional region where there is superlattice reflection but no α_2precipitation and the α+α_2 region. A point of maximum aluminium content was found to exist onthe α/α+a_2 boundary and the track of the boundary was explained in terms of the internal oxida-tion of lanthanum and the electron concentration rule for α_2 formation

Key words: Ti-Al-La ternary system phase boundary α_2 precipitation internal oxidation electron concentration

Received: 18 April 1988

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