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

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...

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.

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