کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8044054 | 1518915 | 2018 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of phase transformation on the damage tolerance of Ti-Al-N coatings
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
In contrast to earlier work, where we focused on the evolution of fracture toughness upon annealing of free-standing Ti-Al-N films using cantilever bending experiments, here we study the practically more relevant case of thin Ti-Al-N films firmly attached to a stiff substrate. We found - experimentally and by continuum mechanics modelling using the Transformation Field Analysis - that the formation of even tiny fractions of hcp (ZnS-wurtzite type) AlN during decomposition of supersaturated fcc (NaCl-type) Ti-Al-N gives rise to high in-plane compressive stresses in both the matrix and the precipitates. These eigenstresses impede the formation and propagation of cracks as evidenced by cube corner nanoindentation experiments - the measured fracture toughness (KIC) increases from the as-deposited value of â¼4.4â¯MPaâm to â¼8.0â¯MPaâm when annealed at 900â¯Â°C. The (apparent) toughening effects combine with less pronounced inherent toughening and concomitant age hardening effects to enhanced damage tolerance of annealed Ti-Al-N.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 155, September 2018, Pages 153-157
Journal: Vacuum - Volume 155, September 2018, Pages 153-157
نویسندگان
M. Bartosik, H.J. Böhm, C. Krywka, Z.L. Zhang, P.H. Mayrhofer,