Growth of (αTi) grain-boundary layers in Ti–Co alloys

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• 作者：A. S. Gornakova ; S. I. Prokofiev ; B. B. Straumal…
• 关键词：titanium alloys ; cobalt ; decomposition of supersaturated solid solution ; second phase precipitation ; grain boundaries ; kinetics ; diffusion ; coalescence
• 刊名：Russian Journal of Non-Ferrous Metals
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：57
• 期：7
• 页码：703-709
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials;
• 出版者：Allerton Press
• ISSN：1934-970X
• 卷排序：57

文摘

The influence of temperature on the formation of the (αTi) grain-boundary interlayer in alloys Ti–2 wt % Co and Ti–4 wt % Co in the two-phase region (αTi) + (βTi) of the Ti–Co phase diagram is studied in a temperature range of 690–810°C. The growth kinetics of the thickness (Δ) of the grain-boundary interlayer of the (αTi) phase in the Ti–2 wt % Co alloy is investigated at 750°C. Δ depends on the annealing time as ~ t1/3. The analysis of the results of experimental observations makes it possible to assume that an increase in Δ is the manifestation of coalescence of (αTi), which is controlled by the bulk diffusion.