Journal ArticleDOI
Evolution of microstructure and mechanical properties of NiAl-Diffusion coatings after thermocyclic exposure
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In this paper, the compositional and microstructural changes, which occur during the thermocyclic exposure, are correlated with the mechanical properties of NiAl diffusion coatings Prior to and after thermoclic exposure at 900, 1050 and 1100 °C for durations up to 1000h four-point bending flexural tests with in-situ acoustic emission measurement are used to determine the fracture strain of the coating.About:
This article is published in Intermetallics.The article was published on 2017-10-01. It has received 21 citations till now. The article focuses on the topics: Coating & Superalloy.read more
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Oxide scale formation and microstructural degradation of conventional, Pt- and Pt/Ir-modified NiAl diffusion coatings during thermocyclic exposure at 1100 °C
TL;DR: In this paper, the microstructural degradation of Pt- and Pt/Ir-modified NiAl coatings during thermocyclic exposure at 1100°C was investigated, and detailed micro-structural investigation revealed the different beneficial effects of Pt and Ir.
Creep, fatigue and their interaction in coated and uncoated René 80
TL;DR: In this paper, the effects of coating and fatigue on turbine blade creep and fatigue properties of Rene 80 at 900 °C were investigated, showing that coating reduced the high cycle fatigue life because of crack initiation at brittle particles in the coating.
Journal ArticleDOI
Effect of substrate alloy composition on the oxidation behaviour and degradation of aluminide coatings on two Ni base superalloys
TL;DR: In this paper, a coupled thermodynamic-kinetic model was employed to describe the effect of the base material on the depletion processes and microstructural changes in the aluminide coating thus providing a tool for coating life time prediction.
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Oxidation and concomitant effects on the microstructure and high temperature tensile properties of a DS Ni-base superalloy applied with different thicknesses of Pt-aluminide (PtAl) bond coat
TL;DR: In this paper, the microstructure changes occurring in the coating and superalloy substrate during oxidation for various durations were examined, and the concomitant tensile properties for the various oxidized samples were evaluated at 870°C and their fracture behavior ascertained.
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Evaluating the efficiency of grain boundary serrations in attenuating high-temperature hot corrosion degradation in Alloy 617
TL;DR: In this article, the influence of grain boundary serrations (GBS) on high-temperature hot corrosion in Alloy 617 was critically investigated by immersing both the as-received and GBS specimens in the salt mixture comprising of 75% Na2SO4 + 20% NaCl + 5% V2O5 at 1273 K for 24
References
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Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
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Overview No. 104 The physical and mechanical properties of NiAl
TL;DR: A critical review of the physical and mechanical properties of NiAl is presented in this paper, which includes electronic structure and bonding, crystal structure and phase stability, thermodynamic properties, elastic properties, and electrical, magnetic, and thermal properties.
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Physical and mechanical properties of the B2 compound NiAl
TL;DR: In this article, the authors summarize all available mechanical and pertinent physical properties on NiAl, stressing the most recent investigations, in an attempt to understand the behavior of NiAl and its alloys over a broad temperature range.
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Progress in coatings for gas turbine airfoils
TL;DR: In this article, the authors trace the history of protective coatings for superalloy airfoils beginning with simple aluminides, followed by modifications with silicon, chromium and platinum, then MCrAlY overlay coatings, and finally the elegant electron beam vapor deposited ceramic thermal barrier coatings recently introduced to service.
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The deformation properties and electron microscopy studies of the intermetallic compound NiAl
A Ball,R.E Smallman +1 more
TL;DR: In this paper, the properties of NiAl specimens were investigated as a function of testing temperature and composition, and it was shown that at low temperatures the polycrystalline specimens fail in a brittle manner along grain boundaries after little or no plastic deformation.