کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990848 | 1516131 | 2018 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of the ageing conditions and the initial microstructure on the precipitation of α phase in Ti-17 alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The precipitation of α phase during ageing was investigated in the near-β titanium alloy Ti-17 considering either a fully βmetastable initial microstructure or a 35% αprimary + 65% βmetastable initial microstructure. In-situ electrical resistivity and high energy X-ray diffraction measurements revealed the influence of the initial microstructure, with different α morphologies (size and distribution of αprimary), as well as the heating rate on the precipitation sequences and kinetics following the decomposition of the β-metastable phase. Various amounts of metastable phases (Ïisothermal and αâ³isothermal) precipitate in temperature ranges that increase with the heating rate. From temperatures about 500â¯Â°C, the orthorhombic αâ³isothermal structure evolved towards the hexagonal close-packed α as temperature increased. SEM microstructure characterisations showed that slow heating rates promoted a fine and dense α precipitate distribution through the formation of Ïisothermal and/or αâ³isothermal, leading to higher hardness values. A higher heating rate restricted the precipitation of αâ³isothermal and shifted to the one of α at a higher temperature, leading to coarser precipitates. Furthermore, precipitation kinetics of αâ³isothermal/α were quicker considering an initial intragranular α precipitation as compared to α colonies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 763, 30 September 2018, Pages 446-458
Journal: Journal of Alloys and Compounds - Volume 763, 30 September 2018, Pages 446-458
نویسندگان
Nicolas Maury, Benoît Denand, Moukrane Dehmas, Claude Archambeau-Mirguet, Jérôme Delfosse, Elisabeth Aeby-Gautier,