Process for the production of Al-Fe-V-Si alloys

a technology of alfevsi alloy and process, which is applied in the field of process for the production of alfevsi alloy, can solve the problems of low engineering ductility of alloy obtained herein at room temperature, inability to use structural applications, and inability to produce cast homogeneous structure, etc., and achieves high wear resistance, superior properties, and high strength.

Inactive Publication Date: 2003-10-02
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

0010] The main object of the present invention is to establish melting treatment process for the production of ...

Problems solved by technology

In the general melting and casting process, the wide differences of densities and melting point of Al, Fe, V and Si couple with low diffusivity of Fe, V in Al pose problems in producing cast homogeneous structure.
However, alloys obtained herein have low engineering ductility at room temperature and thus cannot be used in structural applications where a minimum tensile elongation of about 3% is required, for example in gas turbines.
Rapid solidification techniques are however, capital intensive and require high skill of operation because:...

Method used

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Examples

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example 2

[0029] 2 k.g of Al-8.0% Fe-0.8% V-0.9% Si alloy was melted in clay bonded graphite crucible in electric resistance furnace. The melt was modified with 1.0% of aluminum 20% magnesium master alloy 20 gm of master alloy was taken. The microstructure obtained by this modification was more uniform distribution of primary and interdendritic phase. The particle size distribution was liner than pure magnesium treatment. The mechanical properties were shown in Table-1. The alloys were further hot rolled at a temperature of 350.degree. C. and deformation was 75%. The mechanical properties was shown in Table-2

2TABLE 2 Mechanical Properties of hot worked alloys, hot rolled at 350.degree. C., reduction 75% 0.2% proof strength Strength Elongation Alloy composition Condition of the alloy (kg / mm2) (kg / mm2) % Al-8.3Fe-0.8 V-0.9 Si 1.0% of Al-20% Mg 26 32 8.5 Al-8.3Fe-0.8 V-0.9 Si 1.5% of Al029% Mg treated 29 35 9.0 Al-8.3Fe-0.8 V-0.9 Si 0.5% of Ni-20% Mg treated 29.5 35 12 Al-8.3Fe-0.8 V-0.9 Si 1.0%...

example 3

[0030] 3 kg of aluminum 08.3% iron-0.8% vanadium-0.9% silicon alloy was melted in a clay bonded graphite crucible in electric resistance furnace. The alloy was modified with 1.0% of nickel--20% magnesium The materials taken were silicon 30 gm, ferro-vanadium 38 gm, aluminium--30% iron master alloy 780 gm, nickel magnesium 30 gm. After degassing the melt the alloy was modified. Prior to modification the master alloy was preheated to 250.degree. C. The microstructure obtained by modification was more uniform distribution or primary and interdentic phase. The particle size distribution was finer than pure magnesium treatment. The mechanical properties were shown in Table-1. The alloys were further hot rolled at a temperature of 350.degree. C. and deformation was 75%. The mechanical properties are shown in Table-2.

[0031] By the process of present invention a cast high strength and high wear resistant Al--Fe--V--Si alloy having uniforms distribution of primary phases in the form of cuboi...

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Abstract

The present invention relates to an improved process for the production of high strength and high wear resistant Al-Fe-V-Si alloys. The present invention comprises modifying/blocking primary intermetallic phases as well as interdendritic silicide phases by treating the melt with elemental magnesium or magnesium bearing master alloys to get a structure containing uniform distribution of intermetallic phases. The uniform distribution of primary and interdendritic phases are obtained with addition of magnesium or magnesium bearing master alloys because morphology of the interface changes resulting in the creation of more nuclei. It also breaks dendrite of the primary particles leading to structural change and fine particles. The present invention is useful for the industries engaged in production of high strength wear resistant aluminium alloys which are widely used in aerospace, transport and other engineering sectors.

Description

[0001] The present invention relates to an improved process for the production of high strength and high wear resistant Al--Fe--V--Si alloys. The present invention will be useful for the industries engaged in production of high strength wear resistant aluminium alloys which are widely used in aerospace, transport and other engineering sectors.[0002] In the general melting and casting process, the wide differences of densities and melting point of Al, Fe, V and Si couple with low diffusivity of Fe, V in Al pose problems in producing cast homogeneous structure. Al--Fe--V--Si alloys are generally produced and shaped through a costly technique or rapid solidification--powder compacting--extrusion / rolling route. In the prior art rapid solidification processes, such as atomization and melt spinning are used to obtain rapidly solidified alloy powders or ribbons respectively.[0003] U.S. Pat. No. 2,963,780 discloses a method for obtaining improved tensile strength at 350.degree. C. in alumin...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/03C22C21/00
CPCC22C1/026C22C21/00C22C1/03
Inventor SAHOO, KANAI L.CHITTUR, SIVARAMAKRISHNAN S.
Owner COUNCIL OF SCI & IND RES
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