Metallurgical and Materials Transactions back issues from February 2006:
Phase Diagram Calculations in Teaching, Research, and Industry
Feb 01, 2006; ... I have a long-standing interest in alloy thermodynamics/phase diagrams and in utilizing the principles of this subject for materials research and engineering applications. At the same time, I also have a long association with ASM International as a member and a former Trustee of the Society. The ...
Effects of Ru Additions on the Microstructure and Phase Stability of Ni-Base Superalloy, UDIMET 720LI
Feb 01, 2006; ... The effects of Ru additions on the microstructure and phase stability of the Ni-base superalloy U720LI were examined. The results show that the alloys with Ru contents of 0 to 6 wt pet had a dendritic structure, and the volume fraction of the primary γ solid-solution phase in the dendritic ...
High-Temperature Environmental Embrittlement of Thermomechanically Processed TiAl-Based Intermetallic Alloys
Feb 01, 2006; ... Thermomechanically processed TiAl-based intermetallic alloys with various alloy compositions and microstructures were tensile tested in various environmental media, including air, water vapor, and a gas mixture of 5 vol pct, H^sub 2^ + Ar, as functions of temperature and strain rate. All the ...
Fabrication of Lotus-Type Porous Carbon Steel by the Continuous Zone Melting Method and Its Mechanical Properties
Feb 01, 2006; ... A lotus-type porous carbon steel with cylindrical pores was fabricated by the continuous zone melting method in a pressurized mixture of hydrogen and helium gases. The porosity increases with increasing partial pressure of the hydrogen gas, while the pore diameter remains almost constant, ...
Influence of Topologically Closed Packed Phase Formation on Creep Rupture Life of Directionally Solidified Nickel-Base Superalloys
Feb 01, 2006; ... Several experimental superalloy compositions based on the alloy IN792 were investigated. Creep rupture properties were measured and microstructures in the as-heat-treated condition and after creep rupture testing were evaluated. Two types of topologically closed packed (TCP) phases have been ...
Prediction of Bending Limits in Friction-Stir-Processed Thick Plate Aluminum
Feb 01, 2006; ... Friction-stir processing (FSP) was used to modify surface microstructures, to enhance the bending of thick-plate 6061-T6 and 7050-T7451 aluminum alloys. Plates were bent at room temperature into a V-shaped die, to various angles. Bending performance in the friction-stir-processed plates was ...
Use of Neutron and Synchrotron X-Ray Diffraction for Evaluation of Residual Stresses in a 2024-T351 Aluminum Alloy Variable-Polarity Plasma-Arc Weld
Feb 01, 2006; ... The residual stress fields associated with variable-polarity plasma-arc (VPPA) welds in 2024-T351 aluminum alloy plates have been measured nondestructively using neutron and synchrotron X-ray diffraction. Neutron diffraction allows in-depth measurements of the full strain tensor to be made in ...
Residual Stresses in a Quenched Superalloy Turbine Disc: Measurements and Modeling
Feb 01, 2006; ... A series of neutron diffraction measurements have been carried out to determine the elastic residual strains deep within a large, 40-cm-diameter, forged and water-quenched IN718 aeroengine compressor disc. Neutron path lengths of up to 6 cm were necessary to probe the thickest parts of the ...
The Effect of Electrochemically Induced Annealing on the Pitting Resistance of Metastable Austenite Stainless Steel
Feb 01, 2006; ... Deformation-induced martensites in metastable austenite stainless steels affect their physical and chemical properties. Electrochemically induced annealing (EIA) is a recently discovered phenomenon. Although the reason why EIA treatment causes martensite to decrease or disappear is not clear, ...
Precipitation Hardening in Mg-Ca-Zn Alloys
Feb 01, 2006; ... Based on thermodynamic calculations, four alloys in the system Mg-Ca-Zn produced by gravity die casting were solution treated and aged at 175 °C for different times. The scanning electron microscopy and X-ray diffraction analyses of the solutionized alloys were in good agreement with the ...
Transient Liquid Phase Bonding of Ferritic Oxide-Dispersion-Strengthened Alloys
Feb 01, 2006; ... Joining of two ferritic oxide-dispersion-strengthened (ODS) alloys, MA956 and PM2000, using transient liquid phase (TLP) bonding is discussed. Thin-film boron coatings of different thicknesses were used as interlayers and different bond orientations with substrates cut along and normal to the ...
Severe Plastic Deformation of Nickel-Coated Aluminum Precursor Powders at Elevated Temperatures
Feb 01, 2006; ... Two nickel (Ni)-coated aluminum (Al) powders were consolidated to full or near-full density by using the equal-channel angular extrusion (ECAE) technique. Mixtures (in at. pct) of 78A1-22Ni (63Al-37Ni in wt pct), hereafter termed Al-22Ni, and of 39Al-61Ni (23A1-77Ni in wt pct), hereafter termed ...
Comparative Microstructural Characterization of a Friction-Stir-Welded Aluminum Alloy Using TEM and SEM-Based Techniques
Feb 01, 2006; ... Comparison is made between images collected using four different transmission electron microscopy (TEM) and scanning electron microscopy (SEM) techniques from the same region of a commercial Al alloy processed by friction-stir welding. The techniques include conventional bright-field TEM, ...
Phase Diagram Calculations in Teaching, Research, and Industry
Feb 01, 2006; ... I have a long-standing interest in alloy thermodynamics/phase diagrams and in utilizing the principles ., of this subject for materials research and engineering applications. At the same time, I also have a long association with ASM International as a member and a former Trustee of the Society ....
Electrical and Electronic Conductivity of CaO-SiO^sub 2^-FeO^sub x^ Slags at Various Oxygen Potentials: Part I. Experimental Results
Feb 01, 2006; ... The oxygen potential dependences of total electrical and partial electronic/ionic conductivities for 'FeO'-CaO-SiO^sub 2^ slags have been studied both experimentally and theoretically in the present work. In the first part of this two-part article, the experimental results are presented for ...
Alloy Shrinkage Factors for the Investment Casting Process
Feb 01, 2006; ... This study deals with the experimental measurements and numerical predictions of alloy shrinkage factors (SFs) related to the investment casting process. The dimensions of the A356 aluminum alloy casting were determined from the numerical simulation results of solidification, heat transfer, ...
Solid-Solid Reactions in the Ca^sub 3^(AsO^sub 4^)^sub 2^-Ca^sub 2^SiO^sub 4^-CaSO^sub 4^ Ternary System at Elevated Temperatures
Feb 01, 2006; ... Exploratory laboratory-scale tests were performed in order to identify the solid phases present in the Ca^sub 2^SiO^sub 4^-Ca^sub 3^(AsO^sub 4^)^sub 2^ binary system and in the Ca^sub 2^SiO^sub 4^-Ca^sub 3^(AsO^sub 4^)2-CaSO^sub 4^-CaO system. A microanalysis study from slow-cooled samples ...
The Fluctuations in Slag Foam Under Dynamic Conditions
Feb 01, 2006; ... In the present article, slag foaming phenomenon under dynamic conditions is critically analyzed on the basis of the results of high-temperature X-ray image analysis experiments. The results indicate that the mismatch between the gas generation rate and gas escape rate has a serious impact on the ...