کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445136 1509557 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of nitrogen vacancies on the high temperature behavior of (Ti1−xAlx)Ny alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Impact of nitrogen vacancies on the high temperature behavior of (Ti1−xAlx)Ny alloys
چکیده انگلیسی

Substoichiometric solid solution alloys of cubic (Ti1−xAlx)Ny with x = 0.26, 0.48 and 0.60, and y ranging from 0.93 to 0.75 were grown by cathodic arc deposition. The influence of nitrogen deficiency on their thermal stability was studied by X-ray diffractometry, differential scanning calorimetry, scanning electron microscopy, and atom probe tomography. The nitrogen deficiency did not significantly affect the columnar growth nor the as deposited hardness. At elevated temperatures, alloys with x = 0.48 and 0.60 decompose isostructurally into cubic c-TiN and cubic c-AlN domains, which is consistent with spinodal decomposition. The decomposition is retarded by decreasing the nitrogen content, e.g. the formed isostructural domains in (Ti0.52Al0.48)N0.92 at 900 °C are similar in size to (Ti0.52Al0.48)N0.75 at 1200 °C. The formation of hexagonal w-AlN is shifted to higher temperatures by decreasing nitrogen content. Nucleation and growth of Al-Ti clusters in a Ti rich matrix were observed for the alloys with high Ti content, x = 0.26. These results suggest that nitrogen deficiency reduces the driving force for phase separation.

Impact of nitrogen vacancies on TiAlN thin films. Reconstructed 3D APT tips of (Ti0.52Al0.48)Ny, with y = 0.92, 0.87 and 0.75, after heat treatment at 1200 °C.Figure optionsDownload high-quality image (1097 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 119, 15 October 2016, Pages 218–228
نویسندگان
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