High Temperature Micromechanical Behavior of a Pt-Modified Nickel Aluminide Bond-Coating and of Its Interdiffusion Zone with the Superalloy Substrate

Metallurgical and Materials Transactions A - The micromechanical properties of a $$\beta $$-(Ni,Pt)Al bond-coating was investigated between $$700\,^\circ \hbox {C}$$ and $$1000\,^\circ \hbox {C}$$...     

In Situ Study of Temperature Stability and Precipitation Kinetics of $$\delta $$ and $$\eta $$ Phases in Nickel Base Superalloys

Metallurgical and Materials Transactions A - The present study aims at determining the temperature stability and precipitation kinetics of phases like $$\delta $$ -Ni $$_3$$ Nb, $$\delta $$ -Ni...     

Two-Phase Eutectic Growth in Al-Cu and Al-Cu-Ag

Metallurgical and Materials Transactions A - The microstructure developed by two-phase lamellar eutectics $$(\alpha )$$ – $$(\theta {\text {-Al}}_{2}{\text {Cu}})$$ in Al-Cu and Al-Cu-Ag...     

Phase Transformation and Atypical Variants in an Extruded Two Phase Zirconium Tube

Metallurgical and Materials Transactions A - The texture evolution of a Zr-2.5wt pctNb alloy pressure tube is characterized after the $$\alpha \rightarrow \beta $$ transformation and the $$\beta...     

Influence of Oxygen on the Kinetics of Omega and Alpha Phase Formation in Beta Ti–V

Metallurgical and Materials Transactions A - A detailed understanding of the kinetics of phase formation in $$\beta $$ -stabilised titanium is of decisive importance for the applicability of these...     

Mechanistic Modeling of Cyclic Softening and Slip Localization in Ni-Based Superalloys

Metallurgical and Materials Transactions A - Ni-based superalloys are typically strengthened with ordered fcc $$ \gamma^{\prime} $$ precipitates (L12 structure) which impart a number of hardening...     

Tensile Behavior of Air Plasma Spray MCrAlY Coatings: Role of High Temperature Agings and Process Defects

Metallurgical and Materials Transactions A - $$\beta $$-$$\gamma $$ MCrAlY coatings generally exhibit a brittle mechanical behavior below 600 °C. When exposed at elevated temperatures, the...     

In Situ Bulk Observations and Ab Initio Calculations Revealing the Temperature Dependence of Stacking Fault Energy in Fe–Cr–Ni Alloys

Metallurgical and Materials Transactions A - The dependence of stacking fault energy ( $${\gamma }_{\text{SFE}}$$ ) on temperature in austenitic Fe–Cr–Ni alloy powders was investigated...     

The Effect of Heating Rate on Discontinuous Grain Boundary Alpha Formation in a Metastable Beta Titanium Alloy

Metallurgical and Materials Transactions A - Continuous grain boundary α ( $$ \alpha_{\text{GB}} $$ ) is often observed in age-hardened metastable β titanium alloys and plays a...     

Elastic Properties of Novel Co- and CoNi-Based Superalloys Determined through Bayesian Inference and Resonant Ultrasound Spectroscopy

Metallurgical and Materials Transactions A - Bayesian inference is employed to precisely evaluate single crystal elastic properties of novel $$\gamma -\gamma '$$ Co- and CoNi-based superalloys...     

Laser Ultrasonic Measurements of Phase Transformation Kinetics in Lean Ti–Mo Alloys

Metallurgical and Materials Transactions A - Molybdenum (Mo) is one of the most common $$\beta $$ -stabilizing elements used in commercial titanium alloys. In comparison with other traditional...     

Calculation and Use of Variable Diffusivity for the Analysis of Transient Liquid Phase Bonding Behavior

Metallurgical and Materials Transactions A - A numerical forward simulation technique is used to calculate the concentration-dependent interdiffusion coefficient $$\left( {D = F\left( c \right)}...     

Mechanical and Microstructural Analysis of Friction Surfaced Aluminum Coatings on Silicon Nitride Ceramic Substrates

Metallurgical and Materials Transactions A - The lack of suitable techniques for joining Si $$_{3}{\text{N}}_{4}$$ ceramics with metals has limited the usage of this otherwise outstanding material...     

Thickness-Dependent Mechanical Behavior of 〈111〉-Oriented Cu Single Crystals

Metallurgical and Materials Transactions A - To explore the dependence of mechanical behavior on the crystal size, the $$ [\bar{1}11] $$-oriented Cu single crystal was selected as a target...     

Relationship between texture and DC magnetic induction after various stages of processing in a 1 pct Si steel

Hot-rolling using a finishing temperature of 1450°F (series A) produces at the mid-thickness a strong partial fiber texture with the [011] axis parallel with the rolling direction and a sharp texture gradient towards the surface. A finishing temperature of 1600°F (series C) results in a near random mid-thickness texture and less texture heterogeneity. The dc magnetic induction at 100 oe,B(100), was measured at 0, 45, and 90 deg to the rolling direction. For series A,B ₄₅>B ₀>B ₉₀ while for series C,B(100) was more isotropic in accordance with the observed texture. After rolling 25 through 50 pct and annealing, series A was less highly textured than series C with the principal differences between the two materials being the intensities of the (200), (220) and (222) planes. The individual magnetic properties of both series showed changes with increasing deformation in whichB ₄₅ decreased whileB ₀ andB ₉₀ increased in A and changed little in C. The averaged magnetic properties of each series based onB ₀ andB ₉₀, , differed from those based uponB ₀,B ₄₅, andB ₉₀, , since in the hot-rolled condition while . After annealing, with increasing prior cold reduction, increased more rapidly than while remained constant and decreased slightly.     

Thermodynamic properties of the vapor transport reactions in the Au−Cl system by a transpiration-mass spectrometric technique

A new transpiration-mass spectrometric technique is described for the study of vapor transport reactions, whereby the vapor transport species can be identified and their partial pressures determined from mass spectrometer ion intensity data. The vapor transport species in the Au?Cl system at low temperature (T<450°C) has been identified as Au₂Cl_8(g). For the reaction $$2Au_{(c)} + 3Cl_{2(g)} = Au_2 Cl_{6(g)} $$ the following results were obtained $$\Delta G_R^\circ = - 24,600( \pm 4400) + 59.8( \pm 8.2) T; \pm 1200 cal$$ A vapor pressure diagram for the Au?Cl system has been constructed from the experimental results and selected data from the literature. A new vapor transport species Au FeCl_8(g) was identified when chlorine was passed over a mixture of iron and gold. Formation of the vapor complex gives rise to increased transport rates.     

Thermodyn mics of oxygen in liquid tellurium from electrochemical me surements

The activity coefficient of oxygen in liquid tellurium at 753 nd 823 K w s measured by the coulometric titration method employing solid electrolyte. The oxygen was found to obey Henry’s law, and the standard Gibbs energy of solution of oxygen in liquid tellurium for l/2O₂ O (1 t. pct) was determined to be: 1 $$\Delta G^O (inTe ) = ---21,840 + 10.3T (cal/g--atom)$$ 2 $$ = ---91,380 + 43.1T (J/g--atom)$$ . The standard Gibbs energy of formation of TeO₂ was also determined by using similar electrochemical cell; the result is: 3 $$\Delta G^O (TeO_2 ) = - 79,920 + 46.5T(cal/mol)$$ 4 $$ = - 334,400 + 194.6T(J/mol)$$ The solubility of oxygen in liquid tellurium was calculated from the combination of these two results to be: 5 $$C_S = \exp (6.52 - 9119/T)(at.pct )$$ By comparison of the present results for tellurium with the published values for the other elements, thermodyn mic behavior of oxygen dissolved in liquid elements was discussed and compared with sulfur dissolved in liquid elements.