کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447181 988638 2011 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase separation and formation of omega phase in the beta matrix of a Ti–V–Cu alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Phase separation and formation of omega phase in the beta matrix of a Ti–V–Cu alloy
چکیده انگلیسی

The formation of the ω phase in the presence of simultaneous development of compositional modulations (or phase separation) within the body-centered cubic β matrix phase of a Ti–10V–6Cu (wt.%) alloy during continuous cooling has been investigated using a combination of transmission electron microscopy and atom probe tomography. While a water quench from the high-temperature β phase field allows apparently athermal formation of ω domains without any significant partitioning of solute or modulation in matrix composition, subsequent annealing at 500 °C for just 60 s leads to unusually rapid growth of the ω domains concurrent with, but apparently independent of, a slower development of finer-scale modulations in solute composition occurring apparently uniformly across both ω and β phases. In contrast, on slower air cooling from the solution treatment temperature, there are pronounced compositional fluctuations within the β phase, presumably as a product of spinodal decomposition, that are detectable prior to the formation of ω phase. The ω phase subsequently forms preferentially in solute-depleted regions of the matrix β, with a composition reflecting the local matrix composition and a solute content significantly lower than the average matrix composition. As a result, it has a cuboidal morphology, distinguishably different from the elliposoidal form that is observed in samples water-quenched and annealed at 500 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 8, May 2011, Pages 2981–2991
نویسندگان
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