Showing papers in "Intermetallics in 2005"

TL;DR: In this article, the authors reviewed the strengthening mechanisms which are provided by the phase diagram, such as solid-solution hardening, strengthening by precipitates, or ordering, for the binary and ternary alloys.

TL;DR: In this article, the ultrafine scale microstructure of three MA/ODS ferritic alloys (12YWT, 14YWT and MA957) was characterized by atom probe tomography in the as-received condition and after isothermal heat treatments at temperatures of up to 24h at 1300°C (∼85% T m ).

TL;DR: In this article, various models for the prediction of the occurrence and stability of Laves phases have been discussed and the need for careful experimental investigations of phase equilibria is demonstrated, and some general rules for the occurrence of different Laves phase polytypes are derived from a study of the results of experimental phase diagram investigations of various binary and ternary systems.

TL;DR: In this article, a new Ti-42Al-5Mn (at.%) alloy was developed, which features capabilities for hot forging and machining, and in this study hot forging was performed from an industrial perspective and it was ascertained that the objective components could be fabricated using this new alloy.

TL;DR: In this article, the phase equilibria among β/α(α 2 )/γ phases and phase transformations involving β-Ti phase in Ti-Al-M (M is β stabilizer against α phase in pure Ti) ternary systems at elevated temperatures were characterized.

TL;DR: In this paper, the authors investigated the oxidation behavior of gamma alloys in air and scale spallation, and found that the gamma alloy was superior in oxidation behavior to binary TiAl alloys under both isothermal and cyclic exposure.

TL;DR: In this paper, the effects of Cr (5 or 8 ǫ at.%) and Ta (6 or 8 ) in the microstructures of as-cast and heat-treated Nb-24Ti-18Si-5Al in situ composites have been studied.

TL;DR: In this article, the passive film behavior of CP Titanium, Ti-6Al-4V and Ti-based intermetallic Ti-13.4Al-29Nb was investigated as a function of immersion time in simulated body condition (Hank's solution), utilizing potentiodynamic polarization and electrochemical impedance spectroscopy techniques.

TL;DR: In this article, the effects of Aluminium and Niobium contents on tensile properties, on creep strength and on oxidation resistance of Ti2AlNb-based alloys have been investigated.

TL;DR: In this article, the authors show that the ductility of nickel-based superalloys can be improved by a two-step aging treatment, and the dependence of the secondary creep rate on the applied stress on the aged alloys is described by a power law if a threshold stress is introduced.

TL;DR: The fracture behavior of this Fe-based bulk glassy alloy is significantly different in comparison with the well-studied Zr-, Cu- or Ti-based good glass-formers as discussed by the authors.

TL;DR: In this article, a new kind of surface modification, called "laser interference metallurgy" is reported, which allows the creation of periodic pattern of features with a well defined long-range order on metallic surfaces in the scale of typical microstructures (i.e. from the sub micrometer level up to micrometers).

TL;DR: In this paper, the high-cycle fatigue behavior of bulk-metallic glass (BMG) was studied using an electrohydraulic machine at a frequency of 10 Hz with a R ratio of 0.1 in air at room temperature and under tension-tension loading.

TL;DR: A comprehensive review of recent work on the effect of minor alloying additions on glass formation in bulk metallic glasses can be found in this paper, where the beneficial effects of these elements are discussed in terms of physical metallurgy principles.

TL;DR: In this article, the corrosion behavior of two Mg-Al-Er alloys with increasing content of erbium (Mg 95 Al 3 Er 2 and Mg 95Al 2 Er 3 ) has been evaluated in borate buffer solution and compared with that of the commercial AM60 alloy (mg-6.0Al-0.13Mn, at%) employed in the automotive industry.

TL;DR: In this paper, the mechanical properties of Fe-15Al and Fe-26Al with alloying additions are investigated by means of hardness tests and tensile tests in order to determine the room temperature ductility and high temperature tensile strength at temperatures of possible industrial applications.

TL;DR: In this article, the fatigue properties of TiAl alloys, namely fatigue life, cyclic stress-strain behavior and fatigue crack growth resistance are reviewed, and the influence of different parameters (microstructure, defects, temperature and environment) on these properties is examined.

TL;DR: In this paper, the room temperature tensile properties of a number of cast TiAl-based alloys, which have been grain-refined either by additions of boron or by a new quenching and ageing treatment, have been assessed.

TL;DR: In this article, the effects of complex loading on fatigue strength have also been investigated with pre-creep deformations of 0.5, 3 and 5%, pre-exposure to 700 Â c for 24 and 150 Â h or pre-low cycle fatigue testing at 700 Ã c.

TL;DR: In this article, a high Nb containing γ-TiAl based sheet material with 46.5 at.%Al and 9.1 at.%.Nb has been tested in order to analyse the influence of microstructure and texture on creep.

TL;DR: In this article, the crystal structure and magnetic properties of Sm(CO,M)(7) (M = Si, Cu, Ti, Zr and Hf) compounds with the TbCu7-type structure have been investigated by means of X-ray powder diffraction and magnetic measurements.

TL;DR: In this article, a thermodynamic analysis indicated that the simultaneous formation of TiAl and Ti5Si3 increases the adiabatic flame temperature during the reaction between the powders.

TL;DR: In this article, two alloy systems, pure nickel and Be-B binary alloys, were studied and the results discussed. And they showed that an apparent inverse HP relationship is, in fact, an artifact caused by the presence of relatively soft amorphous Be−B phases when the grain size of Be was significantly refined by B alloying.

TL;DR: In this article, two-phase Fe-rich Fe-Al-Zr alloys have been prepared consisting of binary Fe−Al with a very low solubility for Zr and the ternary Laves phase Zr(Fe,Al).

TL;DR: In this article, room temperature fracture toughness was measured for polycrystalline, fully ordered, stoichiometric intermetallic compounds tested in room air of normal humidity, and the KIC values were found to be 12.0, 25.5, and 19.1 MPa m for YCu, DyCu and YAg.

TL;DR: In this paper, the effects of the casting conditions, including superheat, rotation speed at one mould temperature have been investigated in terms of the product integrity and porosity and the microstructure of the valves.

TL;DR: In this article, the ternary system Fe-Al-Ta allows the formation of the hard and brittle Laves phase Ta(Fe0.5+x,Al0.4+x)2 with hexagonal C14 structure.

TL;DR: The physical properties of the ternary intermetallic system Ni-Fe-Al in the ground state and at finite temperatures were investigated by combining ab initio electron theory and statistical mechanics.

TL;DR: In this paper, a state-of-the-art infrared-thermography camera has been used as a nondestructive evaluation (NDE) method to investigate the temperature evolutions in both crystalline and amorphous materials during fatigue experiments.

TL;DR: In this paper, the structure, physical properties, processing and related microstructure of RuAl and its alloys are presented in Part I of this overview, with a particular emphasis on the recent studies.