Showing papers in "Materials Characterization in 2002"

TL;DR: In this article, the continuous stiffness measurement (CSM) technique was used for the characterization of layered materials and nonhomogeneous composites and applied to the measurement of contact stiffness, elastic modulus, hardness, creep resistance, and fatigue properties of the materials used in magnetic storage devices.

TL;DR: In this article, a systematic characterization study has been carried out on different materials such as commercial purity titanium, Ti-6Al-4V, 316L stainless steel, and a cobalt-based alloy under simulated body fluid conditions at 37 °C.

TL;DR: In this article, the use of dilatometry in solid-solid phase transformation research in steel is described, with an emphasis on continuous heating and cooling transformation diagrams, showing the microstructural constituents that result from given heat and cooling conditions, and are an invaluable tool for the metallurgist in characterizing steels with respect to their response to heat treatments.

TL;DR: In this paper, the HP steels modified with Nb and Nb-plus-Ti, produced in the form of centrifugally cast tubes, were characterized by means of light optical microscopy, scanning electron microscopy (SEM) with secondary and backscattered electron imaging, and transmission electron microscope with energy-dispersive spectroscopy (EDS) and selected area diffraction.

TL;DR: In this paper, the surface structures of a Nb(100) single crystal in the initial stages of oxidation have been investigated by ultrahigh vacuum (UHV) scanning tunneling microscopy (STM).

TL;DR: In this article, the effect of specimen roughness on the accuracy of the indentation results is taken into account, and the results introduced show that the defined material elastoplastic deformation characteristics, based on the nanoindentation test results, are independent of the indenter type (Vickers or Berkovich) when deviations in the indent tip geometry from the ideal are considered.

TL;DR: In this article, the bonding properties of Al and interstitial free steel and Al and stainless steel friction-welded components were studied through optical and electron microscopy, and tensile strength measurements.

TL;DR: The phase equilibria in the Fe-Al-Si ternary system have been studied in the temperature range 600-900 °C using ternaries diffusion couple experiments with pure Fe and high purity Al-Si eutectic alloy.

TL;DR: In this paper, several quantitative methods, which determine the relative volume fraction of α-Al(FeMn)Si and β-AlFeSi, are compared and an assessment of each method is made.

TL;DR: In this paper, high-resolution synchrotron X-ray diffraction was used to study the phase transformations in titanium alloys and the results were used to trace the kinetics of surface oxidation and the concurrent phase transformations taking place under different conditions.

TL;DR: In this article, an object-oriented finite element approach to microstructure-based modeling is provided with two examples: SiC particle-reinforced Al matrix composites and double-cemented WC particle-resinforced Co-matrix composites.

TL;DR: In this paper, the surface oxide films on titanium were characterized and the relationship between the characterization and the adsorption of bovine serum albumin (BSA) on titanium was studied.

TL;DR: In this paper, the advantages and disadvantages of thermal etching for revealing the prior-austenite grain boundaries in microalloyed steels are discussed. But, they do not consider the impact of the grain boundaries on the grain size.

TL;DR: In this article, the effect of the microstructure of nickel-aluminum-bronze (NAB) alloy on its cavitation corrosion behaviour in seawater using a 20-kHz ultrasonic induced cavitation facility was investigated.

TL;DR: In this paper, solid-state direct bonding between commercially pure titanium and type 304 austenitic stainless steel has been carried out in the temperature range of 850-950 °C, under a uniaxial pressure of 3 MPa for 1 h.

TL;DR: The conformation of the bubbles was influenced by the atomic steps of the graphite substrate and shadows found around the bubbles were attributed to the interactions between a bubble adhered to the tip and the bubbles on the surface as discussed by the authors.

TL;DR: In this paper, a macro-crack in one of the samples provided an opportunity to study the mechanism of crack propagation and the sequence of oxidation of the constituent elements in the material.

TL;DR: In this article, the characterization of powder injection molding (PIM) feedstock consisting of 91 wt.% M2 high speed steel (HSS) powder and 9 wt% PAN250 polymer binder is presented.

TL;DR: In this article, secondary cleavage cracks in the A 508 C1.3 bainitic steel were analyzed using electron backscattering diffraction (EBSD) and scanning electron microscopy (SEM).

TL;DR: In this article, the dissolution of Al2Cu in two AlSi-Mg-Cu aluminum alloys was investigated by calorimetric analysis and metallographic measurements, and the results obtained were in agreement with metallodynamic measurements.

TL;DR: In this article, the relationship of the bond parameters and tensile strength of the joints was discussed, and the optimum bond parameters were obtained for diffusion-bonded TiAl-based alloy to steel was carried out at 850-1100 °C for 1-60 min under a pressure of 5-40 MPa.

TL;DR: In this article, the average height of the roughness between the pores of a polishing pad was measured using white light interferometry (WLI) using an ATR/FTIR method, which was found to provide a novel opportunity for the nondestructive surface analysis of pad materials.

TL;DR: The phase equilibria in the Ti-Al-Si system have been studied in the temperature range 700-1000 °C using ternary diffusion couple experiment with pure titanium and high-purity Al-Si eutectic alloy.

TL;DR: In this paper, serial sectioning and 3D reconstruction techniques were used to reveal the three-dimensional morphology, connectivity and distribution of the intermetallic microstructure, and the evolution of these parameters during homogenisation.

TL;DR: In this article, the carburization phenomenon in two tubular materials made from Fe-Cr-Ni-based HK40 alloy was investigated after a service life of approximately 25,000 h in an ethylene pyrolysis furnace and compared with the original as-cast structure.

TL;DR: In this article, the ion nitriding behavior of AISI 5140 low-alloy steel was investigated under different process parameters including time (1, 4, 8, and 12 h), temperature (400, 450, 500, and 550 °C), and gas mixture ratio (0.05, 0.33, and 3 N2/H2).

TL;DR: In this paper, a series of wear-resistant irons were cast, and in some cases heat treated, to study and characterize their microstructure, and a rational criterion for the selection of the most adequate material for wear and erosion applications was derived.

TL;DR: In this paper, the residual macroscopic stresses in titanium nitride (TiN) coatings deposited by DC planar magnetron sputtering (DCPMS) on a ternary copper alloy were determined under different conditions of applied current intensity, Ar/N 2 flow ratio and bias voltage.

TL;DR: In this article, the authors focused on the production of a dual-phase steel structure in the core of a surface-carburized AISI 8620 cementation steel and the effect of martensite volume fraction (MVF) and particle size (MPS) on tensile properties.

TL;DR: In this article, the historical perspectives and fundamental physics involved in this field are reviewed and the experimental techniques and theoretical approach are discussed in detail, as well as the experimental results and theoretical framework are discussed.