کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5440310 | 1398227 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase transformations and microstructural features in hafnium nitrides
ترجمه فارسی عنوان
تغییرات فاز و ویژگی های ریز ساختاری در نیتریت هافنیم
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کلمات کلیدی
سرامیک درجه حرارت بالا، نیترید هفنیوم، فشار داغ داغ، زوج پراکندگی، ریز ساختار،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
Two sets hafnium nitride diffusion couples processed by hot-isostatic pressing at 1200 °C and 1900 °C were formed by reacting Hf with HfN. The 1900 °C couple consisted of Hf grains next to ε-Hf3N2 grains with fine Hf laths. These were followed by refined ζ-Hf4N3 grains abutted to the equaxied HfN grains that had a precipitated crisscross pattern of ζ-Hf4N3 laths on the close-packed planes of HfN; this microstructure agreed with a model's prediction that these interfaces are the most thermodynamically favorable nucleation sites. The 1200 °C couple revealed similar regions except for a lack of this crisscross ζ-Hf4N3 lath morphology in HfN. The lower temperature is suspected to kinetic limit the condensation of nitrogen vacancies necessary to facilitate lath precipitation. A range of lattice parameters were found to occur for the ε-Hf3N2 and ζ-Hf4N3 phases within the couple indicting that these nitrides are not line compounds but accommodate some amount of stoichiometry variation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 37, Issue 15, December 2017, Pages 4532-4538
Journal: Journal of the European Ceramic Society - Volume 37, Issue 15, December 2017, Pages 4532-4538
نویسندگان
Bradford C. Schulz, Steve DiPietro, Christopher Weinberger, Gregory B. Thompson,