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AlTx™ – Aluminium

AlTx is an ultra high strength aluminium alloy that has been developed for applications that require high-strength metals with elevated-temperature strength capable of substituting steel and titanium in various constructions. In this regard superfast aluminum alloy crystallization opens a considerable prospect of creating new materials. The necessity of high mechanical and specific characteristics retention is one of the main problems of large-scale production of goods made of particles crystallized at high speeds of cooling.

High-strength aluminum alloys.

Simultaneous action of compressive fluid pressure and intensive shift/displacement deformations has beneficial effect upon bonding in the solid phase in the course of pressure welding, that accounting for the natural tendency of shift deformation enhancement and provision of properties’ homogeneity in various ways.

The existing approaches to shift/displacement deformations intensification in different ways (lateral extrusion, work part curling in the container, “drawing-yielding-drawing”-type compacting, etc.) provide considerable elimination of these disadvantages and semiproduct / intermediate product quality enhancement. However due to the complexity of their realization, low performance, intermediate products range restriction, and deformation shift level insufficiency the latter cannot be used industrially.

These conditions can be fulfilled only in case of combination of compacting with twirling of the deformed material in the furnace of the deformation region.

Significant research was conducted in the domain of shift deformations in the course of compression’s influence upon the structure and mechanical characteristics of powdery, granule and cast aluminum alloys, resulting in a new process flow scheme enabling us to create any wide range shift deformations with high hydrostatical pressure required. Being simple to realize, this scheme does not demand any structural alterations of the compression process.

Table1. Physical and mechanical characteristics of powder aluminum alloy bars depending on the compression/compacting process flow scheme.

Compression scheme

Alloy

Physical and mechanical characteristics

Ultimate stress limit δb, MPa

Yield point δ0.2, MPa

Stretch ratio δ, %

Hardness, HB

Coefficient of thermal expansion

Elasticity modulus E, MPa

Conventional

1969+20%SiC

630

520

0.9

-

-

-

1969

590

510

3,5

-

-

-

Hydraulic forging

1969+20%SiC

660

590

1,6

-

-

-

1969

630

560

5,0

-

-

-

AlTx-HS

1969+20%SiC

715

642

2,6

2100

11,6

11600

1969

680

620

6,0

1500

21,6

7200

Table 2. Mechanical characteristics of granulated aluminum alloys samples

Compression scheme

Alloy

Mechanical characteristics

Ultimate stress limit δb, MPa

Yield point δ0.2, MPa

Stretch ratio δ, %

Hardness, HB

Conventional

1959

644

550

11,5

1660

1969

673

642

4,3

1910

AlTx

1959

720

675

14,0

1850

1969

752

719

5,0

2100

Table 3. Mechanical characteristics of cast aluminum alloys

Compression scheme

Alloy

Mechanical characteristics

Ultimate stress limit δb, MPa

Yield point δ0.2, MPa

Stretch ratio δ, %

Hardness, HB

Conventional

B95

480

400

10,0

1400

1420

465

312

14,0

-

AlTx

B95

510

420

15,0

1500

1420

505

358

18,0

-

Thus the results of research of the AlTx technological process with the use of additional shift deformations on account of work part curling in the swage of the matrix funnel as against conventional technologies show the expedience of wide use of the process, ensuring:

- obtaining of new materials with a high mechanical and other specific properties;

- uneven deformation distribution reduction;

- introduction of additional shift deformations in the course of extrusion, enhancing the level of physical characteristics of the material;

- abatement of the anisotropy of properties in axial and cross sections of the material with minimal elongation ratios;

- power consumption reduction;

- deformation temperature decrease.

The aforesaid technological process has been industrially tested at the leading aircraft manufacturing facilities, showing positive results.

Components and goods produced with the employment of this technology can be applied in various domains of technology, sports industry, PPEs, etc.

Electrically Conductive Heat Resistant Alloys

Technical/commercial aluminum and low-helium Al-Mg-Si alloys are frequently used as conductor aluminum alloys. Operating temperature of electric wires made of aluminum alloys does not normally exceed 100°C. But at present it is necessary to enhance the temperature operation level of conductor aluminum alloys, granules metallurgy being the optimal method of production. Al-REM-based alloys seem to be the most perspective alloys for electric current conductors. Find physical characteristics of some aluminum alloys for electric current conductors.

Table 4. Physical characteristics of some aluminum alloys for electric current conductors.

Ultimate stress limit δb, MPa

Yield point δ0.2, MPa

Stretch ratio δ, %

Hardness, HB

Electric conductivity as to copper electric conductivity, %

20°C

250°

20°C

250°C

A997

170

25

15

60

60

AD31

240

60

10

8

48

AlTx-P3M

230

168

3

9

54


Thus granulated aluminum alloys containing rare-earth metals possess high stable technological properties at high temperatures, corrosion resistance, high possibility, which allows production of high electric conductivity (Al-7%REM=0,031-0.032 m Ohm۰m, which is 54% of copper electric conductivity and 90% of pure aluminum electric conductivity) micron cable/wire and can be applied for long operation at temperatures up to 150°C. 15%REM and more alloys have elevated-temperature strength and can operate at 300-350°C.

Yet this production is very expensive esp. owing to the indispensability of the granules degassing cycle for the process, the latter requiring sophisticated costly equipment, supplementary material costs, and excessive time consumption.

The developed procedure allows to avoid granule degassing on account of the developed briquettes’ compacting and annealing operating regimes. Sample testing shows that the whole complex of physical and specific characteristics peculiar to conventional methods of Al-REM-based alloys production is retained.

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altx-background-report