کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1660459 1008403 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of fracture behaviour of bond coats on nickel superalloy by three-point bending of microbeams
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Study of fracture behaviour of bond coats on nickel superalloy by three-point bending of microbeams
چکیده انگلیسی

A microbeam testing geometry is designed to study the variation in fracture toughness across a compositionally graded NiAl coating on a superalloy substrate. A bi-material analytical model of fracture is used to evaluate toughness by deconvoluting load–displacement data generated in a three-point bending test. It is shown that the surface layers of a diffusion bond coat can be much more brittle than the interior despite the fact that elastic modulus and hardness do not display significant variations. Such a gradient in toughness allows stable crack propagation in a test that would normally lead to unstable fracture in a homogeneous, brittle material. As the crack approaches the interface, plasticity due to the presence of Ni3Al leads to gross bending and crack bifurcation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 204, Issue 5, 15 December 2009, Pages 586–592
نویسندگان
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