Armored deformable aluminum alloy

FIELD: metallurgy.

SUBSTANCE: invention proposes alloy containing the following components, wt.-%: zinc, 5.4-6.2; magnesium, 2.51-3.0; manganese, 0.1-0.3; chrome, 0.12-0.25; titanium, 0.03-0.10; zirconium, 0.07-0.12; beryllium, 0.0002-0.005; sodium, 0.0001-0.0008; copper, 0.2, not above; iron, 0.3, not above; silicon, 0.2, not above, and aluminum, the balance. Alloy provides enhancing uniformity of armor structure and its welded seams, stable armor resistance of extended armor welded seams independently on disposition of units to bed welded, elimination of splits from armor rear site in case its resistance to a missile impact, elimination possibility for reducing tenacity of armor during its exploitation including using under conditions of combination with dynamic protection of armored-body and armor-carrying mechanized objects. Invention can be used in producing armor for individual protection and for protection of mechanized armor-carrying objects against effecting agents.

EFFECT: improved and valuable properties of alloy.

1 tbl

 

The invention relates to metallurgy and can find application in the manufacture of armor for personal protection (helmets, shields, armor, etc. and to protect mechanized proneness objects (buildings and items, cars, military vehicles and ships and so on) from the effects of weapons.

Specific properties of the armor, determined by the operating conditions of the object of protection is the resistance of the material of the armor and its welded joints to the impact of bullets, shells of various calibers, min, fragments, etc. and combinability with other types of active and passive protection.

Therefore, to welded metal alloys used for the manufacture of armor, in addition to the General requirements for mechanical strength, resistance to General corrosion and stress corrosion, also meet the requirements breastaurant, survivability, etc. as the metal and welds.

Known deformable aluminum alloy containing the following components, wt.%: zinc 3,0-6,0; magnesium 0,6-2,5; manganese 0.2 to 0.5; chromium 0,15-0,25; titanium 0,01-0,20; zirconium 0,01-0,2; beryllium 0,0005-0,0015; copper≤0,5; iron≤0.1; silicon≤0,5; aluminum else.

(DE 1274346 C1, C 23 C 21/00, 1968)

However, the known alloy is not shock-proof and cannot be used for the production of armor.

Known deformable swar is by aluminum alloy, containing the following components, wt.%: zinc 5,4-6,2; magnesium of 2.51 to 3.0; manganese 0.1 to 0.3; chrome 0.12 to 0.25; titanium 0,03-0,10; zirconium 0,07-0,12; beryllium is 0.0002-0,005; copper≤0,2; iron≤0,3; si≤0,2; aluminum else.

(EN 2094517 C1, C 23 C 21/10, 1997)

Known alloy, hardened by quenching and ageing, has the following mechanical characteristics: σin=510-560 MPa, σof 0.2=450-490 MPa, δ=7-10%Andto=0,7-1 KGM/cm2. Known alloy is used in the production of large bulletini all-aluminium engineering facilities. However, long welded structures made of this alloy (angular and, especially, rectangular) have some tendency to stress corrosion, which in combination with the temperature-linear deformations of structures can lead to crack formation at the open ends of the corner welds. So in the long run, especially in terms of exposure to alternating loads, the durability of welded structures broncobuster or proneness mechanized objects made from this alloy can be reduced. In addition, armor made from this alloy does not provide a sufficient level of resistance when exposed to projectiles and cannot always be used in combination with active dynamic protection mechanized object is in the form of undermining blocks of explosives.

The objective of the invention is the creation of armour wrought aluminium alloy, providing increased survivability armor when exposed to powerful modern weapons, and long welded joints of the alloy have a high resistance to General corrosion and stress corrosion.

The technical result of the invention is to improve the uniformity of the structure of the armor and its welds, ensuring stable breasticle long welds armor alloy according to the invention, regardless of the location of the welded elements, excluding slit from the back side of the armor when saprobity, excluding the possibility of reducing the survivability of armor in the process of exploitation, including use in combination with an external dynamic protection broncobuster and proneness mechanized objects.

The essence of the invention is that armour wrought aluminium alloy includes zinc, magnesium, manganese, chromium, titanium, zirconium, beryllium, sodium, copper, iron, silicon and aluminum in the following ratio, wt.%: zinc 5,4-6,2; magnesium of 2.51 to 3.0; manganese 0.1 to 0.3; chrome 0.12 to 0.25; titanium 0,03-0,10; zirconium 0,07-0,12; beryllium is 0.0002-0,005; sodium 0,0001-0,0008; copper not more than 0.2; iron is not more than 0.3; the silicon is not more than 0.2; aluminum - rest.

The content of sodium in the amount of 0.0001-0,0008 wt.% armor is the second alloy according to the invention while maintaining high mechanical characteristics helps to reduce the heterogeneity of the structure of the alloy after deformation and heat treatment in the form of lamination (sipernet), and helps to improve the isotropy of the material and the stress relaxation in the extended area of the weld.

Manufacturer armour alloy according to the invention includes obtaining the melt, his semi-continuous casting method in the mold slide or electromagnetic mould for round or flat bars, cutting ingots to slabs, homogenization, milling, standard deformation by rolling, pressing, hammering or die-stamping, heat treatment of workpieces. The desired concentration of sodium in the alloy according to the invention is produced by maturation of the melt in the mixer submerged, for example, cryolite. In the manufacture of forgings used III and IV schemes forging. Heat treatment of semi-finished products includes quenching and artificial ageing at a temperature of 100°C for 24 hours. Welding parts are standard technology. Welded bronekollektsia, including long welds, in addition is maintained at a temperature of 165-175°C for 3-4 hours.

The performance characteristics of the armor of the alloy according to the invention was evaluated in the absence of stratification (sipernet) basic metal, metal heat-affected zone and weld weld joint after additional heating at a temperature of 165-175°C for 3-4 hours; distance reprobate (in meters) armor when firing armor-piercing bullet and B-32 caliber 7.62 mm, 12.7 mm and 14.5 mm; the corresponding limit back strength VPTP(the speed of the projectile in the absence of any damage from the back side) under the action of the striker the caliber of 100 mm at the corners of the meeting 0-50°and also by the presence of the slit from the back side of the base metal and weld metal, the resistance to General corrosion and stress corrosion.

The mechanical characteristics of the alloy according to the invention after quenching and aging do not differ from the mechanical characteristics of the alloy prototype: σin=510-570 MPa, σof 0.2=450-500 MPa, δ=7-10%Andto=0,7-1 KGM/cm2. Structure armor (base metal, weld metal and heat affected zone) regardless of the type of deformation in heat-treated condition is homogeneous with no lamination at high isotropy of the material regardless of the direction (along, across, vertically). The results of the fire and corrosion tests are presented in the table.

Caliber bullet, mmThe armor thickness, mmThe angle, degreesDistance reprobate, mThe value of VPTPm/sThe presence of a dorsal slit (base metal, weld)Resistance to General corrosion and corrosion under tension by the load of 0.9 σ of 0.2
7.62200480-noThe ICC and cracks in the heat-affected zone no
a 7.62204080-no
a 12.73001250-no
a 12.73030790-no
100 (firing pin)4550-750no

The presented results demonstrate the achievement of the technical result and the use of the alloy according to the invention for the manufacture of armor for PPE (helmets, shields, armor and so on), and for objects bronekorpus and pronenesses techniques, including using an external dynamic protection.

Armour wrought aluminum alloy comprising zinc, magnesium, manganese, chromium, titanium, zirconium, beryllium, iron, silicon, copper and aluminum, characterized in that it additionally contains sodium in the following ratio, wt.%:

zincof 5.4 to 6.2
magnesiumof 2.51 to 3.0
manganeseof 0.1-0.3
chrome0,12-0,25
titanium0,03-0,10
Zirconia0,07-0,12
berylliumis 0.0002-0,005
sodium0,0001-0,0008
coppernot more than 0.2
ironnot more than 0.3
siliconnot more than 0.2
aluminumrest



 

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2 cl, 1 ex, 3 tbl

Aluminum-base alloy // 2319762

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EFFECT: improved and valuable property of alloy.

1 tbl

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