Method for preparing high-strength heat-resistant ferro-aluminium alloy parts

A technology of aluminum-iron alloy and heat-resistant aluminum, which is applied in the field of preparation of non-ferrous metal materials, can solve the problems of limited product size, non-compact product structure, low comprehensive performance, etc., achieve high strength and heat resistance, reduce harmful effects, and high The effect of overall performance

Inactive Publication Date: 2008-07-30
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid solidification process has disadvantages such as complicated preparation process, expensive equipment, high production cost and limited product size, so it is only suitable for special fields such as aerospace and military industry
Powder metallurgy technology can also prepare fine-grained high-iron-containing aluminum-iron alloys, but there are also defects such as complicated preparation process, non-compact product structure and low comprehensive performance.

Method used

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  • Method for preparing high-strength heat-resistant ferro-aluminium alloy parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First carry out alloy composition matching, its alloy chemical composition (wt%)

[0016] Fe, Cu, Zn, Mg, Mn, Ti, B, impurities, Al

[0017] 4.1, 4.25, 2, 0.3, 0.5, 0.15, 0.006 1.2, Margin

[0018] Pure iron, copper, manganese, zinc, and magnesium are formulated into master alloy ingots in an intermediate frequency furnace, and then melted in a resistance crucible furnace. 0.7% to 1.2% wt of the liquid is modified, and then solidified into an ingot under the condition of electromagnetic stirring, and the stirring voltage is 150V.

[0019] According to the requirements of the extrusion die, the ingot is processed to the required size. The processed ingot is reheated at a temperature of 640° C. and kept for 30 minutes, so that the liquid phase component of the ingot reaches 30 Vol%. Put the semi-solid ingot into the mold and extrude it. The extrusion pressure is 20Mpa. The alloy properties of the final test are shown in Table 1.

[0020] Table 1 Mechanical propertie...

Embodiment 2

[0023] First carry out alloy composition matching, its alloy chemical composition (wt%)

[0024] Fe, Cu, Zn, Mg, Mn, impurities, Al

[0025] 5.5, 4, 2, 0.4, 0.5, 1.1, margin

[0026] Pure iron, copper, manganese and aluminum are formulated into master alloys of Fe20Al80, Cu50Al50 and Mn10Al90 respectively. When smelting, put AlFe, AlMn master alloy and pure aluminum into a resistance crucible furnace to melt, add AlCu master alloy, Zn and Mg after the alloy is melted, melt and stir for refining, then keep it at 680°C for 25 minutes, and cast it into an ingot. The ingot is processed into an ingot of the desired size.

[0027] The processed billet is reheated at a heating temperature of 630° C., and when the liquid phase component in the billet reaches 50 Vol%, it is put into a mold for extrusion molding. The extrusion pressure is 30Mpa. The alloy properties of the final test are shown in Table 2.

[0028] Table 2 Mechanical properties of Al-5.5Fe-4Cu-2Zn-0.5Mn-0.4Mg

[00...

Embodiment 3

[0031] First carry out alloy composition matching, its alloy chemical composition (wt%)

[0032] Fe, Cu, Zn, Mg, Mn, impurities, Al

[0033] 5, 3, 4, 0.25, 0.7, 1.1, margin

[0034] Master alloys of Fe20Al80, Cu50Al50, Mn10Al90 and Mg20Al80 are used. When smelting, put pure aluminum and AlFe, AlMn intermediate alloys into a resistance crucible furnace to melt, add AlCu, AlMg intermediate alloys and pure Zn after the alloy is melted, heat-retain and stir for refining, and then solidify into ingots under electromagnetic stirring conditions, stirring voltage 200V. The ingot is processed into an ingot of the desired size.

[0035] Carry out secondary heating to the processed ingot, the heating temperature is 620°C, when the liquid phase component in the ingot reaches 35Vol%, put it into the mold for extrusion molding. The extrusion pressure is 100Mpa. The properties of the alloy at this time are shown in Table 3.

[0036] Table 3 Mechanical properties of Al-5Fe-3Cu-4Zn-0.7Mn...

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Abstract

The invention relates to the preparing method of a high-intensity heat-resistant aluminum iron alloy part. Firstly, the alloy components are proportioned according to the weight percentage, i.e. iron 4.0 to 6.0 percent, copper 3.0 to 5.0 percent, zinc 0 to 4.0 percent, manganese 0.3 to 0.7 percent, magnesium 0.2 to 0.5 percent, titanium 0 to 0.25 percent, zirconium 0 to 0.4 percent, boron 0 to 0.008 percent, impurities less than or equal to 1.2 percent and the rest is aluminum. Secondly, the alloy is melted, refined with or without modification processing and solidified to be an ingot blank through an electromagnetic stir or molded into an ingot blank under a heating temperature of 670 to 690 DEG C and during a heat-preserving duration of 20 to 40 minutes. Thirdly, a secondary heating is conducted to the ingot blank under a heating temperature of 620 to 640 DEG C and during a heat-preserving duration of 20 to 40 minutes. Being in a semisolid state, the ingot blank is extruded into an aluminum iron alloy part under a pressure of 20 to 100 MPa. The invention has the advantages that large iron-rich phases are broken up by utilizing an electromagnetic shearing force or the ingot is cast near the phase line to obtain a well-distributed fine non-dentrite structure and then after a semisolid extruded molding, the alloy structure is changed notably compared with the cast structure and the alloy performance is evidently improved. The invention has simple technique as well as low cost and provides a new approach for the structure refinement method of strengthening the phase of similar alloys.

Description

technical field [0001] The invention relates to a method for preparing a nonferrous metal material, in particular to a method for preparing a high-strength, heat-resistant aluminum-iron alloy part. Background technique [0002] Al formed by aluminum and iron 3 Fe intermetallic compounds have good heat resistance, wear resistance and corrosion resistance, and aluminum-iron alloys still maintain the characteristics of low density of aluminum alloys. These characteristics make aluminum-iron alloys suitable for aerospace, aerospace, transportation, machinery and other devices for materials performance requirements. In addition, aluminum and iron are the two most abundant metal elements in the earth's crust, and are also the most commonly used raw materials in industry. They have a wide range of sources and are cheap. Therefore, the development of aluminum-iron alloys has attractive prospects and has attracted attention at home and abroad. However, aluminum-iron alloys prepared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/12C22F1/04C22F1/057
Inventor 袁晓光刘波高鹤黄宏军李润霞
Owner SHENYANG POLYTECHNIC UNIV
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