Aluminium-matrix composite material with boron-containing filler

FIELD: metallurgy.

SUBSTANCE: composite material contains copper, manganese, zirconium, iron, silicon and boron, and has a structure consisting of solid aluminium solution and phases uniformly distributed in it at their further ratio in solid solution, wt %: 6-15 B4C, 2-6 Al15(Fe,Mn)3Si2, 2-6 Al20Cu2Mn3, 0.4-0.8 Al3Zr.

EFFECT: increasing heat resistance of material to heating processes at sufficient level of mechanical properties.

2 cl, 1 tbl, 5 ex

 

The technical field

The present invention relates to the field of metallurgy, in particular to the boron series composite materials, which make demands on the absorption of neutron radiation in combination with low specific gravity.

Prior art

Series composite materials (ACM), containing boron, in particular in the form of connection In4With, possess a unique combination of physical and mechanical properties. Since boron has a property well to absorb neutron radiation, they are widely used in nuclear power [W.K. Barney, G.A. Shemel, W.E. Seymour, Nucl. Sci. Eng. 1 (1958) 439-448]. Although, boron AKM long enough in operation, their use is associated with a number of problems, such as susceptibility to corrosion and the problem of inhomogeneity of the structure. A promising method of their production, can have a positive impact on the properties of the material used in radiation-protective construction is mechanical alloying [R. Mohanty, K. Balasubramanian, S.K. Seshadri, // Materials Science and Engineering - 2007. - V.A498. - P.42-52; M.Khakbiz, F.Akhlaghi, // Journal of Alloys and Compounds - 2009. - V.479 - P.334-341].

Known patent GB 2361934 And (publ. 01.03.2001), which describes ACME, based alloy system Al-Mg-Mn containing boron in the amount of 0.5-10 wt.% and with neutron-absorbing properties. Boron enters the I in aluminum in the form of connection (bored) with a particle size of not more than 300 μm. In addition to aluminum and boron AKM contains magnesium, manganese, silicon, copper in the amount of 0-50 atomic %. A method of manufacturing alloy die - casting and subsequent rolling or forging at a temperature varying between 250 and 600°C or extrusion at a temperature of 400-550°C. the Disadvantage of this AKM is the presence of magnesium in the composition, which has a negative impact on the technological properties of the material, due to the increased oxidation during processing.

Also known AKM consisting of aluminum matrix and boron filler in the amount of 1.5-9 wt.% (U.S. Pat. US 6602314 B1, publ. 05.08.03). As matrix alloys offered: technical aluminum (HHH series), Al-Mn (HHH series), Al-Mg-Si (6xxx series), Al-Zn-Mg (7xxx series), Al-Fe (with an iron content of 1-10 wt.%), and as the boron filler is boron carbide. The dimensions of the original powders of aluminum matrix 5-150 μm and boron carbide 1-60 μm. Method of manufacturing a composite material is obtained by sintering under pressure, with preliminary degassing. The disadvantage of this AKM is the fact that the proposed matrix alloys have different combination of physico-chemical properties that defines a wide range of characteristics, resulting in AKM.

Closest to the claimed invention is the ACME described in patent US 7177384 B2 (publ. 13.02.07). This AKM consists of an aluminum matrix and boron n is politely. As a matrix features alloy 6xxx series based on the system Al-Mg-Si. And as the boron filler is boron carbide In4With or boron oxide In2About3the amount of boron in the material ranges from 1.5 to 9 wt.%. Also foresees the introduction of powders of titanium in the amount of 0.2 to 4.0 wt.% and/or zirconium in an amount of 0.2-2.0 wt.% to the mixture before sintering. Method of manufacturing a composite material is obtained by sintering under pressure, pre-vacuum, at a temperature of 350-550°C and aged 5-10 minutes. The disadvantage of this alloy is limited resistance to heat. This is due to the fact that the alloys of the 6xxx series is strongly rasproschayutsya when heated above 200°C. in Addition, the production of this AKM requires the use of primary materials in powder form.

Disclosure of inventions

The task, which is aimed by the invention is the creation of a series of composite material containing at least 4 wt.% boron and having high heat resistance (heating up to 350°C) with a sufficient level of mechanical properties and its preparation on the basis of secondary raw materials in the form of chips.

The problem is solved by the creation of a boron series of composite material based on aluminum alloy containing copper, Mar is anez, zirconium, iron, silicon and boron carbide (B4C)having a hardness of more than 2.7 GPA and is characterized by a structure composed of an aluminum solid solution and uniformly distributed therein particles of phases In4With Al15(Fe,Mn)3Si2, Al20Cu2Mn3and Al3Zr at the following number:

PhaseMass fraction, %
In46-15
Al15(Fe,Mn)3Si22-6
Al20Cu2Mn32-6
Al3Zr0,4-0,8

Proposed AKM can be made in the form of deformed semi-finished products, in which, after heating at 350°C for 10 hours achieved the following properties tensile: tensile strength (σin) - not less than 450 MPa, the yield stress (σof 0.2) - not less than 400 MPa, elongation (δ) - not less than 4%.

The technology of obtaining AKM involves the following basic steps:

1) preparation of a matrix of melt-based aluminium;

2) getting cast billets by crystallization of the melt;

3) receiving chip put the m cutting cast billets;

4) grinding swarf to the size of the scales of no more than 4 mm in diameter;

5) the production of composite pellets by mechanical alloying crushed chips and powder of boron carbide;

6) receiving AKM by extrusion of composite granules.

The essence of the invention is to provide a structure with uniformly distributed particles of thermally stable phases. This structure allows us to provide the best combination of physical and mechanical properties and processability.

The lower limit on the boron carbide selected in order to achieve the required level of absorption of neutron radiation, and the top - to ensure the necessary level of technology. Because in the process of mechanical alloying (ML) phase4With no interaction with aluminum alloy, its amount is determined by the introduction before the beginning of the process ML.

Phase Al15(Fe,Mn)3Si2formed during crystallization of the matrix aluminum alloy. Its amount is determined by the ratio of manganese, iron and silicon in the alloy. On further technological stages is only the change in the morphology of the particles of this phase.

Phase Al20Cu2Mn3and Al3Zr are formed in the form of a secondary discharge in the process of heating prior to the extrusion process. Their number definition the are as a composition of aluminum alloy, and the process parameters.

Examples

For experimental validation of the proposed invention were prepared AKM based on 5 aluminum alloys with different content of copper, manganese, zirconium, iron, and silicon. Alloys (in the form of flat bars with dimensions of 15×60×180 mm) were prepared in an electric resistance furnace in gravitometric the crucibles on the basis of waste aluminum rod brand AE and other vintage aluminum alloys, as well as dual master alloy (Al-Mn and Al-Zr). Then used the chips obtained during the turning of the bars.

To obtain AKM used: (a) chips matrix alloys in the form of thin flakes of a width not exceeding 4 mm and thickness of 0.5 mm; b) a powder of boron carbide (4(C) with an average particle size of about 100 microns. The original chips and powder were crushed, and then loaded in a planetary mill for carrying out the process ML. Next, the granules were subjected to compaction and subsequent extrusion press, receiving a workpiece with a diameter of 25 mm and a height of 10 mm From the pressed blanks also did the rolled sheet to determine the mechanical properties in tension.

Metallographic investigations were carried out using light (NEOPHOT 32) and e (HITACHI TM) microscopy. The phase composition of the samples was determined using x-ray analysis (DRON-4.0-07) and the local is imicheskogo analysis (JEOL JSM-6610LV with local INCA microanalysis).

Mechanical properties (tensile strength (σin), yield stress (σof 0.2) and elongation (δ)) under uniaxial tension (according to GOST 1497-84) and the measurement of the Vickers hardness (according to GOST 2999-75) was determined at room temperature on a universal testing machine Zwick Z250 and universal hardness tester Wilson Wolpert 930N respectively.

As can be seen from table 1, only the proposed AKM (No. 2-4) provides a combination of high hardness, heat resistance and processability. In ACM, containing particles of phases In4With Al15(Fe,Mn)3Si2, Al20Cu2Mn3and Al3Zr is lower than the stated limits (No. 1), is not achieved the desired level of hardness. The presence of these phases is higher than the stated limits (No. 5) leads to an unacceptable reduction technology (fracture in the extrusion process).

Table 1
Structural characteristics of the experimental AKM and hardness values before and after heating
No.Mass fraction of phase, %Hardness, HV1HPa
In4Al15(Fe,Mn)3Si2 Al20Cu2Mn3Al3ZrHV0HV350ΔHV
13 (2,3)2110,21,40,80,6
26 (4,7)260,82,82,60,2
310 (7,8)440,63,02,80,2
415 (11,7)620,43,23,10,1
520 (15,7)881,0RA is a violation of the billet during extrusion
1HV0- hardness in the initial state; HV350- hardness after heating at 350°C for 10 hours; ΔHV is the change in hardness
2the boron content in AKM, wt.%

For example, the composition No. 2 was determined mechanical properties in tension of 2 mm sheet, annealed at a temperature of 350°C for 10 hours, the Obtained results show that in the deformed semi-finished products achieved the following average properties in uniaxial tensile: tensile strength (σin) - 465 MPa, the yield stress (σof 0.2) - 420 MPa, elongation (δ) - 4,2%.

1. Series of composite material based on aluminum alloy containing copper, manganese, zirconium, iron, silicon, boron, characterized in that it has a hardness of more than 2.7 GPA and is characterized by a structure composed of an aluminum solid solution and uniformly distributed therein particles of phases B4C, Al15(Fe,Mn)3Si2, Al20Cu2Mn3and Al3Zr when following their ratio in the solid solution, wt.%:

B4C6-15
Al15(Fe,Mn)3Si22-6
Al20Cu2Mn32-6
Al3Zr0,4-0,8

2. Series composite material according to claim 1, characterized in that it is made in the form of deformed semi-finished products, which after heating at 350°C for 10 h have the tensile strength (σin) not less than 450 MPa, the yield stress (σof 0.2) not less than 400 MPa, elongation (δ) of not less than 4%.



 

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2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.

EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.

3 cl, 2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.

EFFECT: higher strength and conductivity, hence, reduced weight.

2 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30°C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720°C, during 45-90 minutes.

EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.

2 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.

EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.

8 cl, 1 tbl

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