Showing papers in "Materials Science and Engineering in 1977"

TL;DR: High voltage electron microscopy (HVEM) has been extensively applied in the field of materials science as discussed by the authors, covering the study of heavy metals, ceramics and minerals, large-scale structures, dynamic processes and radiation damage.

TL;DR: In this article, the tensile properties of various alloys of the FeMn-Cr-C system were studied and the effect of temperature on both twinning and f.c.p.

TL;DR: In this article, a rational phenomenological theory of fatigue life prediction under arbitrary variation of cycle amplitude is presented, based on the concept of damage curve families which are defined in terms of residual lifetimes for two stage cyclic loadings, and on an equivalent loading postulate.

TL;DR: In this article, the authors apply recent advances in understanding mechanisms of unidirectional deformation to fatigue and propose reinterpretations or new mechanisms for the following: the formation of dislocation veins and of persistent slip bands (PSB's), the behavior of dislocations in established PSB's, and the transformation of PSB dipolar walls into dislocation cells.

TL;DR: In this paper, the beginning of crystallization was determined as a function of time and temperature for amorphous alloys of Fe40Ni40P14B6, Fe40 Ni40B20, and Fe80B20.

TL;DR: In this article, the conditions of (Δ∈p/2, T) necessary to induce the γ → α′ phase transformation under low cycle fatigue conditions have been studied in an Fe 18Cr6.5Ni0.19C stainless steel, where the formation of α′ martensite was detected magnetically during testing and by using X-ray measurements at failure.

TL;DR: In this paper, the current status of the theory of yield strength was assessed at a workshop at Argonne National Laboratory (ANL) from May 29 to June 1, 1976, where six half-day sessions were held, each concentrating on one problem area, which was reported on by one or two speakers.

TL;DR: In this paper, the authors trace the development of graphite-metal bromide compounds, emphasising the preparative aspects, the compositions, the connection between the crystal structures of the metal halides and the distance of the carbon planes separated by intercalated metal halide, and the reactions of the inserted metal bromides.

TL;DR: In this article, a review on recent developments and results in the field of X-ray stress analysis in the Federal Republic of Germany is presented, where some interesting advances in instrumentation are discussed.

TL;DR: In this article, the authors used differential scanning calorimetry to study the isothermal crystallisation of an Fe80P13C7 metallic glass with additions of Ti and Cr. Between 768 and 781 K the crystallisation occurs in a single stage, the kinetics of which fit an Avrami-Johnson-Mehl relationship with exponent n = 5.1 ± 0.

TL;DR: In this article, a survey of graphite lamellar compounds as a cathode material for primary batteries is presented, where the broadest choice, corresponding to the maximum adjustable parameters, is offered by the "gp acids" intercalation compounds.

TL;DR: In this paper, the π orbitals of graphite seem to be necessary intermediates in the coupling between lithium atoms, and the screening by graphite π orbits is also evidenced by the quadrupolar results.

TL;DR: In this paper, the authors investigated the role of dislocation cell structures in stage III work hardening at the onset of fracture and provided evidence of microcracks at cell boundaries in particle free single crystal materials.

TL;DR: In this paper, a method of predicting long term service lives is developed which allows for structural changes occurring under creep conditions, which is based on measurements of the time to the onset of tertiary creep.

TL;DR: In this article, the second order Raman spectra of pyrolytic graphite has been obtained for both E∥c and Efc and the A2u out of plane mode is identified for the first time and occurs at 868 cm−1.

TL;DR: In this article, the electrostatic interaction between a dislocation and an impurity cation-cation vacancy complex is calculated and found to be too small to explain the observed solution hardening rates in the alkali halides, MgO, and Al 2 O 3.

TL;DR: In this paper, emissions from fatigue crack growth have been examined for three steels (A533B steel, low carbon steel and H1 weld metal) using ACEMAN, a system for acoustic emission source location and analysis.

TL;DR: In this article, a stress-aided, diffusion controlled, viscous boundary approach is adopted which predicts the correct kinetics and inter-dependence of variables, and the activation energy requirement of the model is reconciled with experimental data and the eventual loss of superplasticity is explained.

TL;DR: In this article, the degree of order in the product of a chemical intercalation reaction by X-ray diffraction techniques is outlined and applied to a number of graphite intercalations reactions.

TL;DR: In this article, the synthese des composes lamellaires and the conditions of insertion of reactifs are investigated. And the question of whether a reactif can be used for insertion is addressed.

TL;DR: In this article, the microstructure and low cycle fatigue (LCF) behavior of Al 3 Zr grain-refined AlZnMg alloy were investigated.

TL;DR: In this paper, the development of rolling textures at room temperature rolling of copper single crystals of the six important orientations was systematically investigated and the inhomogeneity of the texture development over the sheet thickness was carefully measured.

TL;DR: In this paper, the authors reported several phase transitions above room temperature, which consist of changes in metal layer stacking and ultimately, at 747 K, the onset of 2D liquid behavior.

TL;DR: In this article, the lattice modes of pure graphite can be divided into intraplanar displacements and interplanar displacement, and the symmetry changes associated with intercalation give rise to both inplane and c-axis zone folding effects.

TL;DR: In this article, a carrier-free radioactive 28Mg was prepared by using the photo-nuclear reaction, 30Si(γ, 2p)28Mg and its diffusivity in Al was determined by the residual-activity method in the temperature range 325 − 650 °C.

TL;DR: In this article, it was shown that very high electrical conductivities are possible in the acceptor compounds of intercalated graphite and that the acid is responsible for a marked increase in the density of charge carriers while the mobility remains high.

TL;DR: In this paper, it was shown that pyrolytic graphite intercalation starts in the interlayer regions next to the two basal planes and not throughout the whole graphite, and if one caps the ends to prevent this end reaction, then no expansion occurs in any region.

TL;DR: In this paper, the physics and chemistry of MoS2 intercalation compounds are investigated, and the structure of the electronic energy band and the normal state and superconducting properties of these compounds are discussed.

TL;DR: The microstructure and phase composition of seven splat-cooled Al alloys with Cr contents up to 7.1 at.% have been examined by light and electron microscopy, X-ray diffraction, and hardness measurements.