Acta Metallurgica (Acta Metall)

Publisher: American Society for Metals; American Institute of Mining, Metallurgical, and Petroleum Engineers; American Society for Testing and Materials, Elsevier

Current impact factor: 0.00

Impact Factor Rankings

2016 Impact Factor Available summer 2017
1997 Impact Factor 2.44

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Website Acta Metallurgica website
Other titles Acta metallurgica
ISSN 0001-6160
OCLC 1460926
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details


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    • Publisher last reviewed on 03/06/2015
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: ABSTRACT: Abstract The paper presents the structure characteristics of porous cellular aluminium alloys molded into metallic shapes which containing soluble granular material (NaCl). In order to reduce the heat losses of the shape into which the granular material has been introduced is necessary for it to be preheated to a temperature close of alloy casting temperature.
    No preview · Article · Jan 1998 · Acta Metallurgica

  • No preview · Article · Jan 1998 · Acta Metallurgica
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    ABSTRACT: High resolution transmission electron microscopy (HRTEM) was used to study the structure of annealing twins in α-Al2O3. A basal twin was found where each of the two twin boundaries with the matrix had a different two-dimensional structure. The energies of alternative twin boundary structures were calculated using an ionic model. The relative difference in the energy of the boundary structures is appreciable, and the relative energies of steps at the boundary required for twin formation and termination show large differences for opposite growth directions in the basal plane. This suggests that the different twin boundary structures are the result of anisotropic growth of alumina, which is related to the lack of centro-symmetry in the trigonal corundum structure. The model is important for an understanding of annealing twin formation and growth mechanisms in sapphire, and could be extended to predict anisotropic growth phenomena for other non-centro-symmetric structures.
    No preview · Article · Feb 1995 · Acta Metallurgica
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    ABSTRACT: A stochastic theory of normal grain growth is proposed. The model is based on the concept that the migration of kinks and ledges should cause a Brownian motion of the grain boundary. This motion results in a drift of the grain size distribution to larger sizes. The kinetics of grain growth is thus related to the kinetics of kinks and ledges; specifically, via the rates of nucleation, recombination and sink annihilation. A variety of growth exponents are obtained from a scaling analysis, but only one universal grain size distribution is applicable in all cases. The specific predictions of this model are in total agreement with the recent computer simulations of domain growth, and are consistent with experimental observations of normal grain growth. Peer Reviewed
    Preview · Article · Aug 1994 · Acta Metallurgica
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    ABSTRACT: Grain growth is analysed on the basis that the necessary boundary motion is random in its essentials. This analysis leads to a growth rate proportional to the reciprocal of the square root of time. It also leads to a common distribution function for grain diameters and grain edges. This distribution accords well with experiment.RésuméLa croissance des grains est analysée en supposant que le mouvement nécessaire des joints est de nature aléatoire. L'auteur trouve que la vitesse de croissance est proportionnelle à l'inverse de la racine carrée du temps, et obtient une fonction de distribution commune pur les diamètres et les arêtes des grains. Cette distribution est en bon accord avec l'expérience.ZusammenfassungKornwachstum wird auf der Grundlage analysiert, daβ die nötige Grenzschichtbewegung im Wesentlichen, dem Zufall überlassen, erfolgt. Diese Analyse führt zu einer Wachstumgeschwindigkeit, die dem Reziprokwert der Quadratwurzel der Zeit proportional ist. Sie führt auch zu einer gemeinsamen Verteilungsfunktion für Korndurchmesser und Kornkanten. Diese Verteilung stimmt mit dem Experiment gut überein.
    No preview · Article · Jan 1994 · Acta Metallurgica
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    ABSTRACT: The nonequilibrium growth of partially supersaturated ferrite plates in Fe-C alloys is examined as a function of the carbon concentration, using a published theory for coupled diffusional/displacive transformations. It is found that the theory correctly predicts the variation in the martensite-start temperature with carbon concentration, but fails to estimate the corresponding variations in the bainite-start temperatures of the same steels. This is attributed to the fact that the model does not include any variations in stored energy has been calculated by fitting against available data.
    No preview · Article · Mar 1993 · Acta Metallurgica
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    ABSTRACT: The change in viscosity of a Pd82Si18 glass during isothermal annealing has been measured in the temperature range of 424-537 K for times up to 325 h. It was observed that the viscosity increased linearly with time and that the rate of increase exhibited an Arrhenius-type temperature dependence with an activation energy of 31 ± 2 kJ/mole. The isoconfigurational viscosity exhibited an activation energy of 192 ± 17 kJ/mole for all states measured in this temperature range. The kinetics of the viscosity changes are explained quantitatively by a new model for structural relaxation, based on an extension of the free volume model for flow.
    No preview · Article · Jan 1993 · Acta Metallurgica
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    ABSTRACT: In this paper the high-temperature plastic deformation of 6 mol% Y[sub 2])[sub 3]-stabilized ZrO[sub 2] polycrystals with grain sizes of 1.8, 3.4 and 6.3 [mu]m are studied in compression between 1350 and 1450[degrees]C in air at constant strain rate (between 1 [times] 10[sup [minus] 5] and 2 [times] 10[sup [minus]4]S[sup [minus]1]) and under constant load (between 5 and 90 MPa). Two mechanical behaviors were observed depending on strain rate or stress levels: grain boundary sliding controlled by cation bulk diffusion, with an activation energy of 560 kJ/mol, and intergranular cavitation without plastic deformation of the grains.
    No preview · Article · Oct 1992 · Acta Metallurgica
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    ABSTRACT: This paper considers the evolution of equilibrium shape during the coarsening of a system of cubic precipitates in a cubic matrix with positive anisotropy [Delta] = C[sub 11] - C[sub 12] - 2C[sub 44] [gt] 0). The system is assumed to have homogeneous elastic constants and isotropic surface tension. The low-energy shapes include the sphere, and the octahedron, tetrahedron and plate with [l brace]111[r brace] faces. Minimization of the sum of the elastic and surface energies shows that the sphere is preferred at arbitrarily small sizes, but ordinarily transforms into a tetrahedron, and finally in a plate as size increases. When [Delta] [gt] 0.79C[sub 11] the octahedron is preferred for a small range of sizes between sphere and tetrahedron. Analytic expressions are given from the equilibrium shape transitions. The results are compared to experimental observations of shape changes during coarsening in (mg, Y)-ZrO[sub 2]. The experimentally observed absence of octahedral shaped precipitates and the size at which tetrahedral shaped precipitates become stable in this system are consistent with the theoretical predictions.
    No preview · Article · Oct 1992 · Acta Metallurgica
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    ABSTRACT: Neutron diffraction experiments were conducted on 15 vol.% whisker and 20 vol.% particulate reinforced aluminum/silicon carbide composites subjected to a rapid quench followed by various deformation histories. Corresponding numerical simulations were carried out using an axisymmetric unit cell model, with a phenomenological, isotropic hardening description of matrix plasticity. Thermal expansion and the temperature dependence of material properties were accounted for. For the whisker reinforced matrix, quantitative agreement was generally found between the measured and calculated residual elastic strains. For the particulate reinforced matrix, the calculations tended to overestimate the magnitude of the residual strains parallel to the deformation axis, but very good agreement was obtained transverse to the deformation axis. For the silicon carbide reinforcement both whisker and particulate, the variation of predicted residual elastic strains along the deformation axis was qualitatively consistent with the measurements, although quantitative agreement was often lacking. Measured and predicted residual strains perpendicular to the deformation axis for the silicon carbide typically were not in agreement. Parametric studies were carried out to ascertain the dependence of calculated flow strengths and residual strains on cell and reinforcement aspect ratio, and on reinforcement spacing and shape.
    No preview · Article · Sep 1992 · Acta Metallurgica
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    ABSTRACT: In this paper, toughening mechanisms in a laminate composite composed of alternating layers of brittle [gamma]-TiAl and ductile TiNb reinforcements are studied. The TiNb phase comprising about 20% of the composite volume, contributed to toughening by both crack renucleation and bridging mechanisms, yielding a steep resistance curve and effective toughness more than ten times higher than the matrix value. In part, the extraordinary toughening is derived from large scale bridging effects, which occur when the size of the bridging zone s not small compared to the crack and specimen dimensions. Large scale bridging model predictions based on independent evaluations of the fundamental composite properties, including the reinforcement stress---displacement function, were in good agreement with the experimental observations. The authors demonstrate how the models can be used to optimize the composite properties for specific applications.
    No preview · Article · Sep 1992 · Acta Metallurgica
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    ABSTRACT: An approximate computational scheme that accounts for boundary movement during diffusion of a surface-deposited tracer into a polycrystalline solid is presented. The method is compared to exact solutions for stationary boundaries and for rapidly-moving boundaries and found to be acceptably accurate. The proposed method bridges the transition between these two limiting cases. When applied to existing data for tracer diffusion into polycrystalline lead. the tracer grain boundary diffusivity is found to be approximately 5 times larger than the value deduced for stationary-boundary theories. The importance of measuring grain growth during the diffusion experiments is noted.
    No preview · Article · Jun 1992 · Acta Metallurgica
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    ABSTRACT: The morphological evolution of coherent inclusions in elastic media is studied in two-dimensions. The inclusions are simple dilations with isotropic surface energy in a system with homogeneous elastic constants of negative anisotropy. The equilibrium sizes at which a circular inclusion transforms to a rectangle or square, and at which a square splits into a doublet or quartet of separated inclusions are computed analytically. A finite-element model is then constructed to simulate the evolution of an arbitrary distribution of inclusions along the minimum-energy path. In the model, the circle evolves into a square, which splits into a doublet by hollowing from its center, or, if this is forbidden, by drawing in a perturbation on its surface. The sizes at which shapes spontaneously transform are compared to the equilibrium values. Finally, the simulation is used to study the evolution of a random distribution of inclusions. The first metastable state assumed by the distribution depends on the elastic interaction, surface energy and areal fraction of the inclusion phase through a single dimensionless parameter that groups these three effects. The results are compared to prior theoretical and experimental work on coarsening patterns in three dimensions.
    No preview · Article · Feb 1992 · Acta Metallurgica
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    ABSTRACT: An NbAl3 + Nb2Al composite reinforced with continuous zirconia-toughened alumina, PRD-166 fibers, was produced by pressure casting and was examined by optical and transmission electron microscopy and energy dispersive spectroscopy. Exposure of the fiber to the molten metal resulted in ZrO2 and Al2O3 grain growth, formation of a thin layer of an amorphous phase on the grain boundaries of Al2O3 and transformation of ZrO2. Preferential Al2O3 grain growth near the surface of the fiber led to the rejection of ZrO2 from this region into the molten metal. In NbAl3 slip occurred by the glide of a<110] superdislocations and to a lesser extent by the glide of a pair of <111BAR] + <311BAR] dislocations on the (112) planes and a/2<110] superpartial dislocations on the (001) plane. The operating slip system in Nb2Al was identified as {010)<100]. a<100] dislocations were dissociated into a/x<100] partial dislocations joined together by a stacking fault.
    No preview · Article · Feb 1992 · Acta Metallurgica