High-temperature isothermal nucleation of the metastable Ω phase in Zr-Nb alloys

被引：0
作者：
Aurelio, G
Guillermet, AF
Bozzano, PB
Cuello, GJ
机构：
[1] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[2] Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[3] Comis Nacl Energia Atom, Ctr Atom Constituyentes, RA-1650 Buenos Aires, DF, Argentina
[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
来源：
ARCHIVES OF METALLURGY AND MATERIALS | 2004年 / 49卷 / 03期
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中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
This paper presents an experimental study and an analysis of the isothermal nucleation of the metastable omega (Omega) phase in a high-Nb Zr-Nb alloy. The work combines in situ neutron thermodiffraction (NTD) with transmission electron microscopy (TEM) observations at room temperature in quenched/aged/quenched alloys. The NTD data are interpreted on the basis of a rather general lattice parameter vs. composition systematics,established very recently by ourselves. The results of the present study yield strong support to a picture of the isothermal bcc --> Omega phase transformation which involves the initial formation of significantly Nb-depleted Omega nucleii.
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页码：457 / 467
页数：11
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