کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10155477 | 1666351 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ultra-high temperature deformation in TaC and HfC
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
TaC and HfC bars were thermo-mechanically tested up to 2900â°C using a non-contact loading method based on the Lorentz force. It was observed that HfC deflected more than TaC up to 2300â°C, which has been contributed to a difference in grain size facilitating diffusional creep, either Nabarro-Herring or Coble creep. Above 2500â°C, TaC continued to deflect more with temperature whereas HfC showed a reduced deflection. This reduced deflection was found to be an artifact of a preload plastic deformation response. Though both sets of samples were identified to have a prevalence of <110>{110} slip, at elevated temperatures, it appears that mass transport and diffusional creep mechanisms dominate evident by porosity in the grain boundaries. The activation energies of TaC were found to be 946â±â157âkJ/mol (between 2500-2700â°C) and HfC to be 685â±â54âkJ/mol (between 2100-2300â°C).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 16, December 2018, Pages 5319-5332
Journal: Journal of the European Ceramic Society - Volume 38, Issue 16, December 2018, Pages 5319-5332
نویسندگان
Chase J. Smith, Morgan A. Ross, Nicholas De Leon, Christopher R. Weinberger, Gregory B. Thompson,