کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7973116 | 1514624 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Creep deformation of Co-Re-Ta-C alloys with varying C content-investigated in-situ by simultaneous synchrotron radiation diffraction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The creep deformation of precipitation hardened Co-Re-Ta-C alloys is investigated during in-situ synchrotron diffraction experiment at 1373â¯K. At room temperature, the alloys have a structure consisting of ϵ-Co (hcp) and metastably retained γ-Co (fcc) and are strengthened by precipitates of the mono-carbide of Ta, which are finely dispersed in the alloy matrix. The alloy exhibits an allotropic ϵâγ-Co phase transformation when heating to >1173K. A lower C content in the alloy generally promotes this transformation. It is shown that this transformation is strongly influenced by application of compressive load. The transformation ϵâγ-Co at high temperature under load leads to microstructure refinement and subsequently to dissolution of hardening precipitates. This results in a considerable acceleration of the creep rate. Further, the equilibrium ratio of γ/ϵ-Co phase is significantly altered under compressive load. This behavior is attributed to a volume relaxation as the ϵ- and γ-Co phase have different unit cell volumes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 719, 14 March 2018, Pages 124-131
Journal: Materials Science and Engineering: A - Volume 719, 14 March 2018, Pages 124-131
نویسندگان
Lukas Karge, Ralph Gilles, Debashis Mukherji, Andreas Stark, Premek Beran, Norbert Schell, Michael Hofmann, Pavel Strunz, Johannes Häusler, Joachim Rösler,