The method of processing of magnesium alloys and products made this way
The invention relates to the field of mechanical engineering and aircraft and can be used in the manufacture of the deformed semi-finished products of magnesium alloys. In the proposed method, including heating of cast billets, manual deformation and cooling, according to the invention, the heating of the workpiece is conducted before each transition step of deformation, manual deformation of the workpiece is performed with a total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air carry out a final heating to 370-420oWith isothermal and final deformation speed 110-4-210-2with-1. Heat cast billets before each transition step deformation is carried out until 280-420oC. Proposed also a product made of the claimed method stepwise deformation of magnesium alloys. The method allows to increase yield and to reduce the anisotropy of the mechanical properties of the deformed semi-magnesium alloys, and products derived from them, while maintaining the values of tensile strength. 2 C.p. f-crystals, 1 table. The invention relates Aichatou of magnesium alloys, designed for the aerospace industry and engineering (parts of seats, trim cockpit, decorative details of the salon, as well as structural components: brackets, rockers, and others).A method of processing of magnesium alloys basis, including heating to a temperature of dissolution of hardening phases, cooling and deformation, in which when the reduction processing heating and cooling carried out repeatedly, and the heat of lead alloy with a speed of 50-60oC/min, cooling to spend 20010oWith, and the deformation is carried out at a temperature of heating followed by cooling in water. The deformation is carried out in two stages, the first stage is carried out at a cooling before the final heating, and the second when the temperature of heating followed by cooling in water.with. The USSR 1033569).The disadvantage of this method is the increase of the anisotropy of the mechanical properties of a deformable semi-finished products, which does not allow to obtain products, working in conditions of loading in the lateral and elevation directions, which reduces the possibility of using magnesium alloys.The closest analogue, taken as a prototype, is the way Ordo 280-360oWith, deformation spend at least one more transition, with all transitions deformation is carried out with one heat continuously to each other with a speed of (210-1-610-2with-1and the total degree of deformation of 88-93%, and cooling is carried out on the air (RF patent 2148104).The disadvantages of the prototype method include low level of yield strength and a significant anisotropy of the mechanical properties of the deformed semi-finished products, which makes manufacture of these products running under load in the direction across the grain.An object of the invention is to increase the yield and decrease the anisotropy of the mechanical properties of the deformed semi-finished products of magnesium alloys and products made from them, while maintaining the values of tensile strength.The goal of the project is achieved by a method for processing magnesium alloys, including heat cast billets, manual deformation and cooling, in which heating of the workpiece is conducted before each transition step of deformation, manual deformation zagotovka athelny heating to 370-420oWith isothermal and final deformation speed (110-4-210-2)with-1. Heat a cast billet is carried out before each transition step of deformation, the heat required for the preparation of patterns to subsequent deformation, should be considered the preferred temperature range 280-420oC.Also proposed product, performed the claimed method of treatment of magnesium alloys.The authors found that heating of cast billets before each transition step strain when reaching the total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air the final heating to 370-420oWith isothermal and final deformation speed (110-4-210-2)with-1create the necessary conditions for the formation of a special structural-phase state of the deformed semi-finished products of magnesium alloys, the choice of temperature range heating of billets prior to each stage of the deformation caused by the transition temperature of the alloy and the m strain, the presence ultrarelativistic hardening phases and fine equiaxial grains. Formed structural-phase state of the alloys increases the importance of the yield strength and reduction of the anisotropy of the mechanical properties of the deformed semi-finished products. Temperature range 280-420oWith is preferable to achieve a technical result.Examples of the implementation of the Workpiece low-magnesium alloy system Mg-Zn-Zr were subjected to stepwise deformation with a thickness of 50 mm to a thickness of 1.5 mm At this temperature before each stage of deformation amounted to 37010oWith a total degree of deformation of 97%.The obtained intermediate semi-finished products were cooled to room temperature, then heated to 39010oWith and permanently deformed in isothermal conditions with a speed of 110-3with-1.The table shows the properties of the deformed semi-finished products made of the proposed method and the method prototype.The proposed method of treatment, compared with the method of the prototype, as follows from the table that has the following preimushestvah anisotropy of strength properties decreased: - the tensile strength of 1.5-2.0 times, the yield strength of 1.8-2.0 times.Using the proposed method of processing magnesium alloys to reduce weight products, increase their operational reliability and service life.Thus, the application of the proposed method allows to obtain products of magnesium alloys with improved strength and processing properties, low anisotropy of strength properties, which increases the life and reliability of these products, reduces their weight and extends the application of magnesium alloys.
Claims1. The method of processing of magnesium alloys, including heat cast billets, manual deformation and cooling, characterized in that the heating of the workpiece is conducted before each transition step of deformation, manual deformation of the workpiece is performed with a total degree of deformation 94,0-99.5%, and after cooling the workpiece in the air carry out a final heating to 370-420oWith isothermal and final deformation speed 110-4-210-2with-1.2. The method according to p. 1, characterized in that the heating of the cast for the new alloys, received by way of step strain, characterized in that it performed way under item 1 or 2.
FIELD: metallurgy, processes for making hot rolled band of magnesium alloy.
SUBSTANCE: method comprises steps of producing strip blank by continuous casting of melt of magnesium alloy; hot rolling of strip blank directly after casting at several passes for producing hot rolled band with thickness no more than 50 mm. Hot rolling is performed at initial temperature values 250°C - 500°C for providing final thickness of band no more than 4 mm. At first pass of hot rolling reduction degree is equal at least to 15%.
EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.
11 cl, 1 dwg, 2 tbl, 1 ex
FIELD: plastic working of special magnesium base alloys alloyed with elements capable to easy evaporation or to generation at deformation oxides hazard for environment, possibly manufacture of rolled sheets used for making anodes of electrochemical current sources.
SUBSTANCE: method comprises steps of preliminarily deforming heated blank of magnesium base alloy and warm rolling of preliminarily deformed blank for producing sheet; before preliminary deformation placing magnesium alloy blank into envelope of aluminum (Al-Mg-Si system) alloy without sealing. Length of envelope exceeds length of blank at least by 10%. Preliminary deformation is realized by hot rolling or upsetting in die set according to configuration of blank.
EFFECT: production of sheets with electrochemical properties uniform along the whole cross section and with enhanced surface quality, safety labor condition due to preventing evaporation of mercury, toxic oxides and other compounds containing mercury, thallium, gallium, cadmium.
12 cl, 4 tbl, 4 ex
FIELD: metallurgy; production of magnesium alloys which are creep-resistant at high temperatures.
SUBSTANCE: magnesium-based alloys are used for manufacture of articles and castings, cylinder blocks for example. Proposed alloy contains neodymium, cerium and/or lanthanum, zinc, zirconium, manganese, oxidation inhibitor and magnesium. Alloy may additionally contain titanium, hafnium, aluminum, copper, nickel, silicon, silver, yttrium, thorium, iron and strontium. Alloys and articles manufactured from them possess high mechanical properties and high creep resistance at high temperature.
EFFECT: enhanced creep resistance of alloys.
21 cl, 7 dwg, 5 tbl, 2 ex
SUBSTANCE: invention relates to metallurgy field. Particularly it relates to thermomechanical treatment of magnesium alloys and can be used while manufacturing of details in aircraft building, rocket technology, motor car structure, in nuclear reactors. Method includes alloy homogenising annealing at the temperature 415-520°C during 4-24 hours, extrusion at the temperature 300-450°C with drafting ratio 7-18 and equal channel angular extrusion at the temperature 250-320°C with true deformation ratio 6-8.
EFFECT: increasing of solidity and plasticity of magnesium alloys.
SUBSTANCE: casting block is heated and it is implemented two-stage deformation with cooling on air. The second stage of deformation is implemented in isothermal conditions at temperature for 50-100 °C lower than temperature of the first stage at a rate 4·10-2-5·10-1 s-1 and with total degree of deformation 65-85%. Between the first and the second stages of deformation it is implemented treatment at a temperature 180-300°C during 1-12 hours.
EFFECT: received deformed semi-products differs by increased strength, plastic and corrosive characteristics at keeping of low anisotropy, that assist to increasing of resource, reliability of particular products from these semi-products, increases ability of its application.
2 cl, 1 tbl, 8 ex
SUBSTANCE: invention refers to treatment of alloys of system Mg-Al-Zn and can be implemented in aircraft and rocket engineering, and motor industry. The procedure consists in alloy direct pressing at temperature 300-450°C with drawing out degree 7-18 and in alloy equal-channel angular pressing (ECAP) in four runs at temperature 220-260°C with true degree of deformation ε=4.5 by arrangement: the first two runs along route C, the third run along route Bc and the fourth run along route C. Before ECAP and upon it alloy is annealed at temperature 345 °C during 1 hour and cooled in air.
EFFECT: raised plasticity and deformability of magnesium alloys at room temperature.
SUBSTANCE: here is disclosed item out of magnesium alloy with coating containing base made out of rolled magnesium alloy containing from 5 to 11 wt % of Al and with medium dimension of crystal grain 30 mcm or less, dimension of inter-metallic compounds 20 mcm or less and depth of surface defect 10 % or less from thickness of rolled magnesium alloy and with anti-corrosion coating. The fabrication procedure consists in production of blank out of rolled magnesium alloy and in application of anti-corrosion coating.
EFFECT: upgraded mechanical properties and corrosion resistance of alloy for fabrication of item.
30 cl, 1 dwg, 20 tbl, 16 ex
SUBSTANCE: low-temperature heat treatment of alloy involves the following stages: (a) providing an alloy capable of strengthening during ageing on the basis of magnesium which is treated with homogenising annealing and hardened, and (b) carrying out the low-temperature ageing of the above alloy at temperature below 100 °C during the period of time required for development of improved response to ageing. Aged alloy contains disperse allocations like Guinier-Preston (GP) zones, including flat GP1 and prismatic GP2 disperse allocations perpendicular to the main magnesium plane.
EFFECT: formation of fine allocations of high number density and improvement of hardness and ductility of alloy.
18 cl, 1 tbl, 11 dwg
SUBSTANCE: plate made from magnesium alloy, product obtained by plastic plate formation and method for its obtaining are proposed. Plate made from magnesium alloy having half-width of peak, which is 0.20 to 0.59 degrees for diffraction peak (0004) at monochromatic x-ray diffraction, which has the value of orientation indicator along axis c, which is equal to 4.00 or higher, and average inclination angle of axis c, which is equal to five degrees or less. The product can be obtained by plastic formation at the temperature of 200°C or higher of the plate made from magnesium alloy. Method for obtaining the plate from magnesium alloy, which involves ingot rolling from magnesium alloy, formation of stress in the plate by its being passed between rolls heated to the temperature of 150°C - 300°C. Plate made from magnesium alloy has high plastic formability when in warm condition.
EFFECT: product made of the plate is characterised by high resistance to impact actions.
18 cl, 2 dwg, 7 tbl, 2 ex
SUBSTANCE: invention relates to metallurgy, particularly, to producing articles from aluminium or magnesium alloys with nano- and sub micro crystalline structure, and articles made thereof. Proposed method comprises preliminary equal-channel angular pressing and subsequent strain-forming of articles thereof. Said equal-channel angular pressing is performed at deformation temperature and rate selected subject to alloy composition by preset relation while strain-forming is carried out by extrusion at room temperature and deformation rate selected subject to alloy composition by preset relation.
EFFECT: better manufacturability, higher strength and ductility.
9 cl, 2 dwg, 1 tbl