Metallurgical and Materials Transactions back issues from November 2002:
On the constitution of the system Al-Mn-Si
Nov 01, 2002; ... The constitution of the ternary system Al-Mn-Si over the entire composition range is investigated using metallography, X-ray diffraction (XRD), and differential thermal analysis (DTA). Ten stable ternary phase are identified and characterized. Isothermal sections for 550 C and 700 TC, the ...
Rapid synthesis of ternary carbide Ti(3)SiC(2) through pulse-discharge sintering technique from Ti/Si/TiC powders
Nov 01, 2002; ... Ti/Si/TiC powders with molar ratios of 1:1:2 (Ml) and 2:2:3 (M2) were prepared for the synthesis of a ternary carbide Ti^sub 3^SiC^sub 2^ by using the mixture method for 24 hours in an Ar atmosphere. The synthesis process was conducted at 120deg C to 140deg C under a pressure of 50 MPa, using ...
A discrete approach to grain growth based on pair interactions: Effect of local grain-boundary curvature
Nov 01, 2002; ... The concept of.local grain-boundary curvature has been introduced in a discrete model for grain growth based on pair interactions. A Rayleigh-shaped quasi-stationary grain-size distribution (GSD) in a free system and log-normal-like distributions in the presence of inhibition have been obtained ....
Modeling M(6)C precipitation in niobium-alloyed ferritic stainless steel
Nov 01, 2002; ... Niobium is used as an important alloying element in the design of heat-resistant stainless steels for automotive exhaust systems. When in solid solution, the niobium improves both the high-temperature strength and the resistance to thermal fatigue life. However, it also forms coarse Fe^sub ...
Dopant particle charactization and bubble evolution in aluminum-potassium-silicon-doped molybdenum wire
Nov 01, 2002; ... The present article describes the creation of dopant inclusions in aluminum-potassium-silicon (AKS)doped molybdenum powder and the generation of potassium bubbles in doped molybdenum wire. Molybdenum wire is used extensively in the incandescent lamp industry for coiling mandrels, filament ...
Statistical self-similarity in Rhines' concept of unique multiphase diffusion paths on the ternary Gibbs' isotherm
Nov 01, 2002; ... For ternary systems with infinite boundary values encompassing supersaturation, interface instability is inevitable with the emergence of internal microstructural order parameters that exhibit autonomy from the initial and/or boundary conditions in accord with tie-line degrees of freedom. A ...
The coarsening kinetics of (gamma') particles in nickel-based alloys
Nov 01, 2002; ... The present article describes a method for calculating the coarsening rate of y' in Ni-based superalloys, which has been applied to both binary Ni-Al alloys and a wide range of multicomponent alloys. A standard coarsening equation is utilized, but innovative methods for calculating the critical ...
Diffusion studies in the (beta)(B(2)), (beta') (Bcc), and (gamma)(FCC) Fe-Ni-Al alloys at 1000 (degree C)
Nov 01, 2002; ... Diffusion studies were carried out in the Fe-Ni-Al system at 1000deg C with solid-solid diffusion couples assembled with Beta (132),Beta' (bcc), and gamma (fcc) single-phase alloys for the development of diffusion structures, diffusion paths, and for the determination of interdiffusion and ...
Change of critical events of cleavage fracture with variation of microscopic features of low-alloy steels
Nov 01, 2002; ... Two steels with different contents of carbon and impurity elements are heat treated to produce various ferrite grain sizes. Four-point-bend (4PB) tests of specimens are carried out at low temperatures. Microscopic observations of metallographic sections and fracture surfaces combined with ...
Some observations of the influence of (delta)-ferrite content on the hardness, galling resistance, and fracture toughness of selected commercially available iron-based hardfacing alloys
Nov 01, 2002; ... Iron-based weld hardfacing deposits are used to provide a wear-resistant surface for a structural base material. Iron-based hardfacing alloys that are resistant to corrosion in oxygenated aqueous environments contain high levels of chromium and carbon, which results in a dendritic microstructure ...
Improvement of gigacycle fatigue properties by modified ausforming in 1600 and 2000 MPA-class low-alloy steels
Nov 01, 2002; ... Fatigue tests were conducted for a modified ausformed and tempered JIS-SCM440 low-alloy (denoted as AF) steel with tensile strengths of 1600 and 2000 MPa, respectively, and were compared with normally quenched and tempered (QT) steel. The 1600 MPa-class modified ausformed steel (AF 1600) ...
Fatigue deformation-induced response in a superduplex stainless steel
Nov 01, 2002; ... The cyclic deformation behavior of SAF 2507 superduplex stainless steel (SDSS) was studied under constant plastic-strain amplitudes. The cyclic hardening/softening curves show initial hardening, followed by softening and, finally, saturation behavior. Two regimes can be differentiated in the ...
Anisotrophy of intermetallic particle cracking damage evolution in an Al-Mg-Si base wrought aluminum alloy under uniaxial compression
Nov 01, 2002; ... Particle cracking is an important damage mode in numerous engineering alloys having anisotropic microstructures. In this contribution, cracking of anisotropic Fe-rich intermetallic particles in an extruded 6061 (T651) Al-alloy is quantitatively characterized as a function of compressive strain ...
Simulation of cavitation processes in superplastic deformation
Nov 01, 2002; ... Cavitation behavior during superplastic deformation is simulated by developing a three-dimensional model which incorporates the continuous nucleation, plastic growth, and coalescence of cavities. The cavity growth rate is determined by using an empirical relationship between the Poisson's ratio ...
The effect of grain boundaries on the athermal stress of tantalum and tantalum-tungsten alloys
Nov 01, 2002; ... The temperature dependence of the yield stress of polycrystalline Ta, Ta-2.47 wt pct W (Ta-2.SW), and Ta-9.80 wt pct W (Ta-lOW) was measured to study the effect of grain boundaries and tungsten concentration on athermal strength components. Compression tests were performed over a temperature ...
Effect of prolonged isothermal exposure on elevated-temperature, time-dependent fatigue-crack propagation in INCONEL alloy 783
Nov 01, 2002; ... The effect of isothermal exposure on the elevated-temperature, time-dependent fatigue-crack propagation (FCP) in INCONEL Alloy 783 is investigated. Commercially produced Alloy 783 was annealed and aged following the standard heat-treatment procedure. One set of specimens was then isothermally ...
Effect of martensite content on friction and oxidative wear behavior of 0.42 Pct carbon dual-phase steel
Nov 01, 2002; ... In order to explore the tribological potential of the dual-phase (DP) steel as a wear-resistant material, the friction and wear characteristics have been investigated for this steel with varying amounts of martensite from 42 to 72 vol pct, developed by varying holding time at the intercritical ...
TiB whisker coating on titanium surfaces by solid-state diffusion: Synthesis, microstructure, and mechanical properties
Nov 01, 2002; ... The study demonstrates the feasibility of synthesizing TiB whiskers on titanium (Ti) surfaces by solid-state diffusion to form a hard and wear-resistant coating. The microstructural and mechanical properties of the TiB coating layer have also been investigated. The TiB coating was formed by the ...
Primary dendrite distribution and disorder during directional solidification of Pb-Sb alloys
Nov 01, 2002; ... Pb-2.2 wt pet Sb and Pb-5.8 wt pct Sb alloys have been directionally solidified from a single-crystal seed with its [100] orientation parallel to the growth direction, to examine the primary dendrite distribution and disorder of the dendrite arrays. The dendrite distribution and ordering have ...
Solidification behavior of Sn-15 Wt Pct Pb alloy under a high shear rate and high intensity of turbulence during semisolid processing
Nov 01, 2002; ... Microstructural evolution under intensive forced convection is of importance to the development of new semisolid processing technologies. Although efforts have been made to understand the nucleation and growth behavior of the primary phase under forced convection, important aspects of ...
Self-propagating reaction induced by ball milling in a mixture of Cu(2)O and Al powders
Nov 01, 2002; ... The mechanochemical reduction of Cu^sub 2^O with Al was induced via ball milling. A self-propagating reaction took place in two distinctly different ways. If the mass of the reactant powder mixture was large enough, ignition happened within a few seconds after starting the mill. Neither the ...
The kinetics of static globularization of Ti-6Al-4V
Nov 01, 2002; ... The kinetics of the evolution of the lamellar-colony microstructure to an equiaxed morphology during heat treatment of a hot-worked, two-phase titanium alloy were established. For this purpose, the alpha/ beta alloy Ti-6A1-4V was isothermally upset forged at 900 deg C or 955 deg C and ...
Large self-thermal-plastic deformation in a NiTi shape-memory alloy fiber-actuated aluminum metal-matrix composite
Nov 01, 2002; ... The present work reports macroscopic thermal-mechanical and in-situ neutron diffraction measurements from a NiTi fiber-actuated aluminum-matrix composite and homogeneous aluminum control materials. Test specimens were subjected to an initial room-temperature, 5 pct tensile elongation and a ...
Mechanical, intergranular corrosion, and wear behavior of aluminum-matrix composite materials reinforced with nickel aluminides
Nov 01, 2002; ... This article presents experimental results of important properties of aluminum-matrix (AA 2014) composite materials reinforced with different intermetallics of the Ni-Al system. For the present study, the intermetallics are prepared either by mechanical alloying (MA) or by gas atomization (GA) ....
Pressure effects on flow and fracture of Be-Al alloys
Nov 01, 2002; ... The flow and fracture behavior of Be-Al alloys were determined in tension with different levels of superimposed pressure. The Be-Al alloys were prepared by Brush Wellman, Inc. (Cleveland, OH) from prealloyed powders processed to either a hot isostatically pressed ("hipped") or cold isostatically ...
Effects of macroscopic pores on the damping behavior of foamed commerically pure aluminum
Nov 01, 2002; ... Experiments have been carried out to study the effects of macroscopic pores on the damping behavior of foamed commercially pure aluminum (FA). The damping characterization was conducted on a multifunction internal friction apparatus (MFIFA). The FA specimens were prepared by an air pressure ...
Phase transformations in FeMnAlC austenitic steels with Si Addition
Nov 01, 2002; ... Alloys of the FeMnAlC system have been studied for over 40 years, and one of the more important aspects for their application in the chemical and aeronautic industries is the possibility of obtaining satisfactory combinations of mechanical strength, fracture toughness, and microstructural ...
Strengthening of virgin martensite through cryogenic deformation
Nov 01, 2002; ... Owing to their significant engineering importance, the strengthening mechanisms of steels have been of lasting research interest.[1-10] Carbon atoms have been found to play a critical role in making the steels strong and their redistribution during aging/tempering following the martensitic ...
Depth profiling of Hf-doped aluminide coating by glow-discharge mass spectromety
Nov 01, 2002; ... As previously elaborated,[1] the dynamic versatility of aluminizing the surface of a Ni-based superalloy by chemical vapor deposition (CVD) provides a potential avenue of uniformly doping the beta-NiA1 coating matrix with a reactive element (e.g., Hf) via proactive control of the gas-phase ...