Showing papers in "Materials Science and Engineering in 1974"

TL;DR: In this paper, the authors conducted compressive plastic deformation experiments between 77°K and 520°K on a bulk Pd0.775 Cu0.06 Si0.165 glass.

TL;DR: In this article, a general interpretation of cyclic response in two-phase alloy has been obtained, interpreted by unidirectional concepts and softening by a disordering hypothesis, a new application with respect to fatigue.

TL;DR: In this article, it was shown that crack closure occurs only when the stress intensity conditions were reduced to below the minimum stress intensity level (KM I N) for the previous fatigue cycles.

TL;DR: In this article, the authors studied the deformation in ferritic - martensitic and ferritic pearlitic steels with 0.3 vol.% inclusion in a continuous matrix.

TL;DR: In this article, the low growth rate and threshold properties of two pearlitic steels have been evaluated and an increasing effect of load ratio was observed as the threshold was approached, such that control of crack growth passed from ΔK to Kmax.

TL;DR: In this paper, a two-stage model for structure sensitive crack growth is proposed, where the transition from structure sensitive to structure insensitive can be correlated with the attainment of a critical value of the reverse plastic zone size equal to the α grain size of the microstructure in question.

TL;DR: This paper considers two forms of a pressure modified yon Mises criterion, shows a comparison with available experimental information, and considers the effect of applied pressure on tensile and/or compressive yield strength.

TL;DR: In this article, the second phase controlled the cyclic response when the precipitates were closely spaced and when the interparticle spacing was equal to or greater than the self trapping distance of dislocations.

TL;DR: In this paper, the authors measured acoustic emission during the fracture of polycrystalline alumina and showed that acoustic emission is obtained during macrocrack growth, which can be used for failure indication.

TL;DR: In this paper, the fatigue life curves were determined both for cycling with constant stress amplitude and for cyclic plastic strain amplitude in the high cycle region (number of cycles to fracture > 105) in eight different materials with U.S.T. ranging from 5 to 80 kpmm−2.

TL;DR: In this article, the authors examined the effect of hydrogen charging on 3.309S in the solution treated and quenched condition and after heat treatment at 975 K for either 15 or 300 min.

TL;DR: In this article, a tentative model is proposed to account for the occurrence of major bursts of cleavage fracture during fatigue, based on the attainment of sufficient tensile stress to cause propagation from a cracked carbide particle situated in a grain boundary ahead of the crack tip.

TL;DR: The athermal component of flow stress, as it is normally determined, is frequently in error for polycrystalline alloys of aluminum as mentioned in this paper, the reason is that a transient occurs in the flow stress deformation temperature curve for these alloys the character of which is a result of dynamic strain aging.

TL;DR: In this paper, a thermo-mechanical processing technique for reducing the transverse effect of high strength Al alloys is described, called Intermediate Thermo-Mechanical Treatment (ITMT), which is based on the combination of warm deformation and heat treatments, and involves the recrystallization of the ingot in small equiaxed grains.

TL;DR: In this paper, the authors investigated the effect of trace additions on growth processes by electron microscopy and found that the critical diameter of the θ′ nuclei is reduced on addition of Cd, In and Sn, the critical thickness remaining unchanged.

TL;DR: In this article, the initial stages of wear were investigated and the importance of cobalt content and distribution, abrasive debris size and environmental factors in controlling the amount of abrasive wear in rock drilling was shown.

TL;DR: In this article, the wear mechanism for rotary drilling of abrasive rock using tungsten carbide-cobalt tools of varying abrasion and fractire resistance is investigated.

TL;DR: In this paper, a tapered disc thermal fatigue test has been conducted on two nickel- and three cobalt-base alloys and the effect of alloy composition, solidification conditions and heat treatment on cracks growing from notches machined on the specimen periphery.

TL;DR: In this paper, a simple two-step, diffusion-reaction concept of subcritical crack growth is proposed for brittle fracture in the presence of a reactive gas environment, on the assumption that collisions between diffusing gas molecules and crack walls determine the flow rate.

TL;DR: In this paper, an approximate method for estimating the strengthening arising from coherent, tetragonally-distorted precipitate particles is presented for alloys containing ellipsoidal or disc-shaped particles lying on {100}.

TL;DR: In this article, constant plastic strain amplitude tests and constant stress amplitude tests in the high cycle region (N > 10 5 cycles) were performed. And the response of the materials is similar during both types of test, and cyclic stress - strain curves found using both procedures are in good agreement.

TL;DR: The effects of increasing Al content and of precipitation of α2 (Ti3Al) on the plastic properties of Ti-8% Al alloys up to 8 wt.p.m, with oxygen contents in the range of 350 to 650 p.m., were determined as discussed by the authors.

TL;DR: In this paper, the effect of the cobalt binder-phase content on the microstructure and certain mechanical properties of TaCCo alloys prepared by liquid-phase sintering was investigated.

TL;DR: In this article, a fresh X-ray study of liquisol-quenched gold-silicon alloys containing 16 and 25 at.% silicon was performed and the Debye-Scherrer reflections due to this new phase can be very satisfactorily indexed on the basis of a cubic (A13 or β-Mn-type) unit cell with 20 atoms and a = 6.750 A.

TL;DR: In this article, high-temperature creep was studied in Pb-9Sn solid solution alloy in the stress region of 3 × 10 −6 − 4 × 10−5 G using double-shear type specimens at temperatures near the melting point.

TL;DR: In this article, the maximum elastic tensile stress at failure in uniform tensile, bend, internal pressure and diametral compression tests is presented in the context of nuclear power plants.

TL;DR: Tritium diffusion in single crystals of rutile (TiO2) was measured at temperatures between 155° and 300° C in this article, where the diffusion equations were derived from micro-densitometer traces of autoradiographs generated by the β-decay of tritium.

TL;DR: In this paper, the equilibrium state of moving dislocations in a crystal during the constant strain-rate deformation is discussed on the basis of three hypothesis, i.e., the configuration of immobile dislocation is such that the static free energy of the crystal associated with existing immobiledislocations be as low as possible.

TL;DR: A review of the literature on the oxidation process in copper can be found in this paper, where the main emphasis is on oxidation to decrease electrical resistivity, but brief discussions are also presented of oxide dispersion hardening and chemisorption.