Showing papers in "Acta Metallurgica in 1966"

TL;DR: In this paper, a superimposed dislocation network is proposed for the cubic system, which is a natural extension of previous dislocation models and models based on coincidence relationships, and explains many of the observed properties of grain boundaries.

TL;DR: In this paper, it is shown that there exists an elastic interaction between the Ni-6.71 wt.% Al alloy particles arising from the difference between the elastic moduli in the precipitate and the matrix.

TL;DR: In this article, an empirical model has been developed to relate the flow stress of the drawn wire to the spacing of substructural barriers in terms of the drafting strain, which indicates that this type of strengthening mechanism is operative in the case of drawn iron wire of commercial purity.

TL;DR: The slip system operating in the β-compound NiAl deformed at temperatures less than 0.45 Tm has been determined by slip trace and contrast analysis using electron microscopy, and the observed slip system compared with general predictions of the slip system in CsCl-type structures from anisotropic elasticity theory as mentioned in this paper.

TL;DR: In this paper, the deformation of tungsten single crystals of various orientations and high purity was investigated in the temperature range of 77°K-450°K and it was concluded that the temperature sensitive yield strength is due to a lattice friction stress.

TL;DR: In this article, the later stages of spinodal decomposition leading to two phases and particle coarsening can be obtained by considering terms in the diffusion equation that originate from a composition dependent diffusion coefficient.

TL;DR: In this paper, the properties of NiAl specimens were investigated as a function of testing temperature and composition, and it was shown that at low temperatures the polycrystalline specimens fail in a brittle manner along grain boundaries after little or no plastic deformation.

TL;DR: In this paper, the stacking fault energy has been measured as a function of temperature between 20°C and 710°C in hexagonal and cubic Co, hexagonal 85% Co 15% Ni and cubic 67% Co 33% Ni.

TL;DR: In this article, the concept of interaction coefficients is generalized to apply to the enthalpy and entropy functions, as well as to the free energy function, and to cover terms of different orders in the expansion of these functions in Taylor's series.

TL;DR: In this paper, it has been verified that the internal twinning resulting from first-stage growth is the inhomogeneous shear of the phenomenological crystallographic theory; i.e. the observed twinning shear gives rise to an invariant (habit) plane consistent with the observed midrib plane trace.

TL;DR: In this article, the precipitation kinetics of six alloys containing 1.00 −2.69 wt. % cobalt were determined at small departures from equilibrium and the results were interpreted in terms of classical nucleation theory and were consistent with the expectation of the chemical model.

TL;DR: In this article, the authors measured the flow stresses and the initial work-hardening slopes in all 24 slip systems by isoaxial compression tests on plates out of aluminum single crystals which had previously been deformed in single slip to a standard stress in stage III.

TL;DR: In this article, a spinodal decomposition of a binary solid solution during continuous cooling should lead to a structure similar to that resulting from isothermal decomposition, consisting of a superimposition of sinusoidally varying composition modulations clustered about a wavelength λmax that has received maximum amplification.

TL;DR: In this paper, a systematic study has been made of strain-ageing in a range of austenitic alloys based on the ironnickel-carbon system and it has been established that the presence of carbon is essential for strainageing to occur.

TL;DR: Binary alloys of Sn with fifteen other metals were rapidly quenched from the melt and examined by X-ray diffraction techniques at low temperatures as discussed by the authors. But none of the new phases were found to be stable at room temperature; they decomposed over a wide temperature range between −100°C and −40°C.

TL;DR: In this paper, the authors used the pulse-echo method to measure the Snoek damping peaks of nitrogen and carbon in α-iron at 6.65 Mc/sec.

TL;DR: In this article, the authors studied the mechanisms through which equilibrium θ precipitates are formed and transitional θ′ precipitates were dissolved in an Al-4% Cu alloy by means of high temperature transmission electron microscopy and found that the diffusion coefficients calculated from these studies are about an order of magnitude higher than values for volume interdiffusion in bulk specimens.

TL;DR: In this paper, the effect of carbon on the yield stress and temperature dependence of yield stress from 300° to 20°K was investigated in high-purity iron single crystals of various orientations.

TL;DR: In this article, the latent hardening in iron single crystals was studied as a function of Burgers' vector combination, amount of prestrain, deformation temperature, and strain rate.

TL;DR: In this article, an examination of the tensile deformation behavior of a commercial aluminium-5% magnesium alloy has been made and regions of uneven yielding, as exhibited in load-extension curves, have been correlated with the occurrence of markings on the specimen surface.

TL;DR: In this paper, the creep characteristics of two purities of nickel have been examined in the temperature range 800dg-965°C using compressive stresses in the range 2000-4000 psi.

TL;DR: In this paper, the grain size dependence of the yield and flow stresses for mild steel have been investigated over the temperature range 20°C2-400°C and dislocation densities of fine grained specimens have also been measured over the same temperature interval.

TL;DR: In this article, the activation energy and activation volume of tantalum and tantalum-base solid-solution alloys were obtained from both constant stress (creep) tests and constant strain rate (tensile or compression) tests.

TL;DR: The steady state creep behavior of three compositions of alpha-brass (90, 80, and 70 at.% Cu) was investigated in the temperature range 550-700°C as mentioned in this paper.