Showing papers on "Aluminium alloy published in 1982"

Iron-chromium-aluminium alloy and article and method therefor

Abstract: A ferritic stainless steel alloy is provided which is hot workable and is resistant to thermal cyclic oxidation and scaling at elevated temperatures. The iron-chromium-aluminum alloy contains cerium, lanthanum and other rare earths and is suitable for forming thereon an adherent textured aluminum oxide surface. An oxidation resistant catalytic substrate made from the alloy and a method of making the alloy are also provided.

A calorimetric study of aluminium alloy AA-7075

Abstract: The differential scanning calorimetry (DSC) technique has been used to examine the precipitation process in the commercial Al-Zn-Mg-Cu alloy AA-7075. In general the results are in good agreement with previous DSC data on a similar alloy and can be related to the precipitation process observed by electron microscopy. However, an additonal precipitation process has been detected at low temperatures, which is usually masked by coarsening and dissolution of Guinier-Preston (G-P) zones formed during room-temperature ageing. This precipitate, which is referred to as the “precursor” to η′ after Lyman et al., does not redissolve on going to higher temperatures and is an important step in the ageing process in these alloys.

Cast aluminium alloy containing dispersions of TiO2 and ZrO2 particles

Abstract: Up to 4 wt% of ultrasonically-pretreated titania and zirconia particles (5μm average size) were dispersed in Al-11.8 wt% Si-1 wt% Mg alloy castings. The technique employed to prepare the cast composites involved mechanically mixing pretreated oxide particles in aluminium alloy melts in the presence of magnesium, followed by casting the resulting mix in permanent moulds. Pretreatment of the oxide particles consisted of agitating the particles in acetone by ultrasonic vibrations to cause the disintegration of agglomerates and the removal of adsorbed water molecules from the particle surfaces. Infra-red (i.r.) spectroscopy of powders showed desorption of water molecules from oxide surfaces by ultrasonic pretreatment in acetone. Ultrasonic pretreatment of oxide particles before their incorporation into the melt and presence of magnesium in the melt were found to be necessary to disperse TiO2 and ZrO2 particles in molten Al. Microscopic studies of the composites indicated dispersed TiO2 and ZrO2 particles which exhibited a reaction zone at the periphery of the particles, and microprobe X-ray elemental analysis confirmed preferential segregation of magnesium at the particle-matrix interface. The composites exhibited an increase in hardness as a result of dispersions of titania and zirconia particles, while the tensile-strength values of composites were comparable with that of the base alloy.

Mechanical behaviour of an amorphous metal ribbon reinforced resin-matrix composite

Abstract: Resin-matrix composites, reinforced with high aspect ratio 2826MB amorphous metal ribbon in a simple stacking pattern, were fabricated and evaluated. Typical composite properties at 60 vol% ribbon are a density of 5.27 g cm−3, a longitudinal tensile strength of 1740 MPa, a transverse tensile strength of 870 MPa, a near-isotropic in-plane modulus of 100 GPa and a fracture toughness similar to that of 6061-T6 aluminium alloy. These composites are also shown to have poor mechanical fatigue resistance. In comparison with other engineering materials, these composites are superior on a specific strength basis. However, they are not competitive with quasi-isotropic AS graphite-epoxy on a specific modulus basis. Because of this deficiency, it is concluded that amorphous metal ribbon reinforced composites would not be in a competitive position for most high performance composite applications. However, the high biaxial composite strength properties, potential low cost, and the unusual soft magnetic properties offered by the ribbons may result in some unique composite applications.

Monitoring Sub-Critical Crack Growth due to Stress Corrosion or Hydrogen Embrittlement by Acoustic Emission

Abstract: Acoustic emission ring-down counting has been used to monitor sub-critical crack growth by stress corrosion of mild steel in disodium hydrogen phosphate, -brass in sodium nitrite and magnesium–7% aluminium in potassium chromate/sodium chloride mixtures, and by hydrogen embrittlement in mild steel and a 7179 T651 aluminium alloy. The level of acoustic emission activity varies widely between different alloy/environment systems and is dependent upon microstructure, fracture path and crack growth rate. The practical significance of the results is discussed.

Laminate of aluminium sheet material and aramid fibres

Abstract: The invention relates to a laminate composed of two, three, four or more aluminium-containing metal sheets. The metal sheets (2), which may for instance be of an aluminium alloy, are bonded together by means of adhesive layers (3). In the adhesive layers, which are of a thermohardening material, there are embedded poly-paraphenylene terephthalamide threads (4). They are provided in the form of yarns made up of endless filaments, which lie in a practically straight line in the adhesive substantially consisting of a thermohardening material. The adhesive layers contain the threads in an amount of 20 to 80% by weight.

Inelastic stress-responses of an aluminium alloy in non-proportional deformations at elevated temperature

Abstract: S ome characteristics of strain-induced anisotropy and effects of strain-rate on them are experimentally investigated under non-proportional loadings at elevated temperature By applying combined loadings of axial force and internal pressure to thin-walled tubes of an aluminium alloy at 200°C, inelastic stress-responses are observed at several constant strain-rates along bilinear strain trajectories It is found that a softening of material and a non-coaxiality between stress and inelastic strain-increment deviators occur after the corner of bilinear strain trajectory These phenomena appear more markedly and then decay more gradually with the increase of corner angle and/or strain-rate Experimental results are qualitatively discussed in terms of the activation of piled-up dislocations as well as the so-called back stress and drag stress

Lithographic printing plate having an aluminium alloy support

Abstract: An aluminum alloy support for a lithographic printing plate, comprising: a rolled plate of aluminum alloy comprised of: 1.2% or less Fe; impurities each present in an amount of 0.15% or less; and, Al as the residual proportion, wherein the rolled plate has a distribution of intermetallic compounds, the compounds having grain sizes of 3 microns or less, which are positioned directly under an outer surface of the rolled plate.

Silicon-aluminium alloy metallization of semiconductor substrate

Abstract: The substrate is heated eg to a temperature of about 200 degrees centigrade and a layer of pure aluminium is applied to the surface The first aluminium layer has a thickness of up to about 75% of the total desired final film thickness The substrate temperature is then lowered to eg about 100 degrees centigrade A second layer comprising aluminium alloy with 1-2% silicon is applied over the pure aluminium layer at this second temperature The method minimises thinning over substrates having steep steps in their surfaces, minimises the amount of silicon diffusion out of and aluminium diffusion into the substrate without silicon precipitation at the substrate-metal interface Heating during subsequent process steps of patterning, passivating and sintering redistributes the silicon to provide on the semiconductor substrate surface a layer of aluminium having a fairly uniform concentration of silicon

Method for the preparation of fiber-reinforced metal composite material

Abstract: A process for preparing a fiber-reinforced metal composite material which comprises (1) combining an inorganic fiber comprising alumina as the main component and silica as the secondary component with an aluminium alloy containing at least one of copper, silicon, magnesium and zinc as the secondary component at a temperature of not lower than the melting point of said alloy to make a composite, (2) subjecting said composite to solid solution treatment, (3) quenching the treated composite and (4) optionally tempering the quenched composite at a temperature of from 100 to 250°C.

Plating for Bearing Applications

Abstract: SummaryOverlays of lead-tin and lead-tin-copper are electrodeposited onto both copper-lead and aluminium alloy bearings to improve resistance to seizure during the initial running-in period. In addition both the corrosion resistance and effective fatigue strength are improved. The diffusion of tin in the overlay to the substrate determines the properties of the overlay during its life, and this effect is examined with respect to corrosion, hardness, wear and fatigue. Comparison is made between the two major overlays and the criteria for the type of overlay employed are examined.

Aluminium alloy bearing

Abstract: An improved aluminum alloy bearing for use in an internal combustion engine, in which an alloy containing 0.5 to 11% of at least one hard element selected from the group consisting of silicon, manganese, iron, zirconium, titanium, antimony, nickel, molybdenum, cobalt, chromium, and niobium as a necessary component, (a) 0.1 to 10% of at least one element selected from the group consisting of lead, cadmium, indium, thallium, and bismuth, (b) 1 to 35% tin, (c) 0.1 to 2% of at least one element selected from the group consisting of copper and magnesium as optional components, and the balance comprising substantially aluminum is bound to a back metal, with 5 or more particles comprising or containing the hard element having a length of 5 mu to 40 mu existing per 3.56 x 10 mm in any portion of the alloy. This bearing has remarkably improved adaptability to, for example, steel-made crankshaft and seizure load.

Effect of penetrant on fatigue of aluminium alloy lap joints

Abstract: The effect of penetrant on the fatigue life of single shear riveted lap joints was investigated by flight simulation fatigue tests using the MINITWIST gust spectrum. The penetrant/material combination investigated was ARDROX 985 P3T and aluminium alloy 202U-T3 sheet material (both bare and clad) respectively. The effect of penetrant on the fatigue life turned out to be positive.

Process for producing a strip suitable for the manufacture of can lids

Abstract: An aluminium alloy with 0.15 to 0.50% of Si, 0.3 to 0.8% of Fe, 0.05 to 0.25% of Cu, 0.5 to 1.0% of Mn, 2.5 to 3.5% of Mg and up to 0.20% of Ti is cast by means of a strip-casting machine of the cast-rolling type to give a 5 to 10 mm thick strip which is cold-rolled to a final thickness of 0.20 to 0.40 mm. The strip is suitable for the manufacture of can lids with stringent demands on strength and deformability.

Process for producing superplastic aluminium alloy plate

Abstract: A process for producing superplastic aluminium alloy plate, which comprises continuously casting and rolling a molten aluminium alloy containing 4.0 to 6.0 wt% of magnesium, 0.4 to 1.5 wt% of manganese, 0.05 to 0.2 wt% of chromium, and less than 0.50 wt% of silicon into a 3- to 20- mm thick strip, subjecting it to an annealing treatment at 420 to 530°C, then to preceding cold rolling and intermediate annealing, and succeeding cold rolling to a rolling ratio of 60% or above.

An experimental study on subsequent yield surfaces for metals

Abstract: In this paper some experimental results on the yield surfaces of metals are presented. The material tested is an aluminium alloy and the experimental technique consists in cutting out flat specimens from a prestrained sheet material.

Method of producing an aluminium heat exchanger

Abstract: A method of producing an aluminium heat exchanger comprises the following steps: Preparation of a corrugated rib from a metal solder sheet composed of a core material made of an aluminium alloy containing 0.5 to 5.0 % by weight of zinc and a coating of a solder material made of an Al-Si alloy, preparation of a pipe composed of an aluminium alloy whose electrode potential is nobler than that of the core material, assembly of rib and pipe, and soldering of the rib to the pipe by heating the preassembled module in an atmosphere which prevents the evaporation of the Zn component of the core material, thereby melting the solder material onto the pipe so as to join the rib to the pipe. During the soldering operation, the Zn component of the core material diffuses into the coating. The rib is at a potential which is sufficiently low for it to be able to act as a sacrificial anode to protect the pipe against corrosion.

Process for manufacturing hollow bodies for pressure containers from an aluminium alloy

Abstract: The present invention relates to a method of manufacturing the hollow body under pressure aluminum alloy type 7475 having both a high strength and a high toughness. The method consists in the following steps: 1 - preparation of a alliaae containing (% by weight): 2 - celαi latter casting in the form of billets 3 - Hot spinning between 350 and 450 ° C by the reverse process in the form of a case 4 - hot stretching then cold of the thus obtained bag 5 - ogivage hot between 350 and 450 ° C 6 - solution treatment between 450 ° and 490 ° C and water quenching to a temperature below 40 ° C 7 - income double bearing type T73 The compressed gas bottles obtained by this method have a hydraulic burst pressure of about 90 MPa. tear is in line with international regulations or in preparation.

Manufacture of disc brake caliper

Abstract: PURPOSE:To reduce the manhour for work and reduce weight by enclosing the caliper body made of steel plate or steel iron with aluminium alloy in the part of a hydraulic cylinder and casting the combined caliper body. CONSTITUTION:A caliper body 1 casted from ductile is set in an aluminium casting mold, and aluminium or aluminium alloy is poured, and forming the part 2 of a hydraulic cylinder, and the caliper body 1 is enclosed and casted. Thus, the caliper integrally casted from ductile and aluminium can be obtained.

Method for the deposit-welding of a metal layer onto an aluminium alloy

Abstract: The present invention relates to welding technology. The method consists in the deposit-welding of a metal layer onto an aluminium alloy using weld-deposited material on the base of an alloy element. The deposit-welding is carried out at a specific heat source output of 10 to 10 W/cm , the weld-deposited material and the weld pool being introduced in a quantity of 20 to 98 percent by weight, whereupon the deposit metal is re-melted with a 1.2- to 10-fold increase in the weld pool volume. The invention can be used with the maximum efficacy in the production of internal combustion engines for vehicles and ships, and fixed internal combustion engines, and also in aircraft and rocket manufacture.

Process for adjusting the composition of a zinc alloy used in the galvanization of steel

Abstract: Process for adjusting the composition of a zinc alloy for the galvanization of steels, the alloy having a composition including the following components expressed in ppm (by weight): lead: 1,000 to 15,000, and as additives aluminium: 100 to 5,000, tin: 300 to 20,000, and magnesium: 10 to 1,000 and being deficient in at least one of said additives, said process comprising adding to the zinc alloy one or more metal compositions which are soluble in molten zinc and which contain a relatively high proportion of the additive in which the alloy is deficient, the amount of the or each metal composition being sufficient to compensate the deficit of the additive. The tin composition is virtually pure tin; the magnesium composition is a ternary alloy of zinc, magnesium (5,000 to 50,000 ppm) and aluminium (10 to 500 ppm); and the aluminium composition is a binary zinc/aluminium alloy containing about 5% of aluminium.

Method of making lithographic printing plates

Abstract: improved substrates for the manufacture of radiation sensitive plates for lithographic printing plate production are obtained by anodising aluminium or aluminium alloy sheets or webs in two stages. In the first stage the electrolyte is phosphoric acid and in the second stage the electrolyte contains a major amount of phosphoric acid and a minor amount of sulphuric acid.

Electrodeposition painting method for aluminum or aluminium alloy

Abstract: PURPOSE:To obtain coating products having a excellent uniformity of film thickness by performing treatment of temporary sealed pore for Al and/or Al alloy materials formed with anodizing films and after making preliminary electrolysis and making barrier type anodizing films grown, by performing potentiostatic electrodeposition in a electrodepositing paint vessel CONSTITUTION:By performing treatment of temporary sealed pore for Al or Al alloy material formed with anodizing films according to normal method and further performing treatments of preliminary electrolysis which made barrier type anodizing film grown, thick barrier films are subjected to form at the part of lower bath resistance (near a counter-electrode) And then the sums of bath resistance and a barrier film resistance at each parts of substances to be coated are equalized In this case, by treating preliminarily temporary sealed pore, the reaction other than the growth of a barrier film is prevented Then by performing potentionstatic electrodeposition in a electrodepositing paint vessel, the electrodeposition products having a very excellent uniformity of film thickness are obtained

Exhaust silencer for internal combustion engines and method of making same

Abstract: An exhaust silencer of this type consists of an internal construction, which comprises for example a central pipe system (10) carrying the gas flow, and an essentially pipe-shaped outer housing (20; 40) of aluminium or an aluminium alloy. In order to produce an exhaust silencer which has both the advantages of the material aluminium as well as the advantages provided by the known surface-protected steel materials and which achieves cost and weight savings with simultaneously increased life, the internal structure (eg. 10) is designed as a self-supporting structural element while the outer housing (20; 40), consisting of aluminium or an aluminium alloy, forms a sleeve entirely bounding the functional cavity of the exhaust silencer, which sleeve is supported on the supporting internal structure (eg. 10). A particularly advantageous method of making a double-layer outer housing of two different aluminium alloys consists of producing the double-layer of two aluminium alloys by extrusion (cold impact forming) of a slug produced from a plated material.

Annealing kinetics of ion-implanted nickel-aluminium alloy

Abstract: The first-order chemical reaction-rate formalism has been used in conjunction with diffusion to describe phenomenologically the annealing of ion-implanted nickel-aluminium alloys. An activation energy of 1.83 eV was determined for the reaction which causes a decrease in the bulk concentration. Possible participants in the reaction have been discussed.

Hydrothermic radiator composed of aluminium alloy extruded segment sections, joined by means of permanent fixing parts.

Abstract: The hydrothermic heating radiator is composed by aluminium alloy extruded bar sections, permanently joined by means of a connecting component, fixed both to the collector and to the heating element by sticking and/or mechanical shrinking.