کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1573652 1514685 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Indentation creep behavior of cold sprayed aluminum amorphous/nano-crystalline coatings
ترجمه فارسی عنوان
رفتار خزش خمشی از پوشش های ضدعفونی / نانو کریستالی آلومینیوم اسپری شده
کلمات کلیدی
اسپری سرد آلیاژ آمورف آلومینیوم، خزش نانو تند، استرس، حجم فعال سازی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی
In this study, we report room temperature creep properties of cold sprayed aluminum amorphous/nanocrystalline coating using nanoindentation technique. Creep experiments were also performed on heat treated coatings to study the structural stability and its influence on the creep behavior. The peak load and holding time were varied from 1000 to 4000 µN and 0 to 240 s respectively. Stress exponent value (n) vary from 5.6 to 2.3 in as-sprayed (AS) coatings and 7.2-4.8 in heat treated (HT) coatings at peak load of 1000-4000 µN at 240 s hold time. Higher stress exponent value indicates heat treated coatings have more resistance to creep deformation than as-sprayed coatings. Relaxed, partially crystallized structure with less porosity, and stronger inter-splat boundaries restrict the deformation in heat treated coatings as compared to greater free volume generation in amorphous as-sprayed coatings. The computed activation volume of heat treated coatings is twice of as-sprayed coatings indicating greater number of atom participation in shear band formation in heat treated coatings. The proposed mechanism was found to be consistent with the stress exponent values.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 658, 21 March 2016, Pages 415-421
نویسندگان
, , , , ,