Electron beam floating zone melting directional solidification preparation method for Fe-Al-Ta composite material

A technology for smelting and composite materials in a suspended area, applied in the field of metallurgy, can solve problems such as restricting structure control and performance improvement, hindering the large-scale application of high-temperature structural materials, and unable to further refine the solidified structure.

Inactive Publication Date: 2017-10-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tensile elongation of this material is only 2%-3%, which is far lower than that of commonly used high-temperature structural materials such as stainless steel and heat-resistant steel, and its machinability is poor, which hinders its large-scale industrial production as a high-temperature structural material. application
[0003] Bridgman method (Bridgman) is a common crystal growth method. Bridgman method has the characteristics of mature technology and stable crystallization process, but the solidification rate of Bridgman technology is 2-15cm / h, which is relatively low, which makes solidification The tissue cannot be further refined; the temperature gradient of the Bridgman technique is also low, about 45K / cm, and the low temperature gradient also severely restricts tissue control and performance improvement

Method used

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  • Electron beam floating zone melting directional solidification preparation method for Fe-Al-Ta composite material
  • Electron beam floating zone melting directional solidification preparation method for Fe-Al-Ta composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0050] 1) Prepare Fe85 / Ta7 / Al8 (at%) eutectic alloy according to the eutectic point of the Fe-Al-Ta phase diagram. Smelted in a vacuum induction furnace with a high-purity Ar atmosphere, and wire-cut into Test stick.

[0051] 2) Cut into Test bar, in the vacuum degree of 1.4~1.6×10 -4 mbar, conduction ratio of 30%, acceleration voltage of 8.7KV, emission current of 11mA in a furnace with electron beam area melting (1600°C) to melt the test bar area. (Using a ring electron gun to melt the test bar and form a narrow melting zone on it. The melting zone is maintained between the original material bar and the solidified material bar by surface tension. When the test bar moves slowly in the vertical direction, it solidifies directionally behind the melting zone. , So as to grow along the vertical direction of the entire rod.)

[0052] 3) The sample melts in a small range, through bottom-up directional solidification, the temperature gradient of the solid-liquid interface is controlle...

Embodiment example 2

[0054] 1) Prepare Fe85 / Ta7 / Al8 (at%) eutectic alloy according to the eutectic point of the Fe-Al-Ta phase diagram. Smelted in a vacuum induction furnace with a high-purity Ar atmosphere, and wire-cut into Test stick.

[0055] 2) Cut into Test bar, in the vacuum degree of 1.4~1.6×10 -4 mbar, conduction ratio of 30%, acceleration voltage of 8.7KV, emission current of 11mA in a furnace with electron beam area melting (1600°C) to melt the test bar area.

[0056] 3) The sample melts in a small range, through bottom-up directional solidification, the temperature gradient of the solid-liquid interface is controlled at 390K / cm, and the solidification rate of the test bar is 1mm / min for directional solidification to optimize eutectic Alloy structure and improve its performance.

Embodiment example 3

[0058] 1) Prepare Fe85 / Ta7 / Al8 (at%) eutectic alloy according to the eutectic point of the Fe-Al-Ta phase diagram. Smelted in a vacuum induction furnace with a high-purity Ar atmosphere, and wire-cut into Test stick.

[0059] 2) Cut into Test bar, in the vacuum degree of 1.4~1.6×10 -4 mbar, conduction ratio of 30%, acceleration voltage of 8.7KV, emission current of 11mA in a furnace with electron beam area melting (1600°C) to melt the test bar area.

[0060] 3) The sample melts in a small range, through bottom-up directional solidification, the temperature gradient of the solid-liquid interface is controlled at 410K / cm, and the solidification rate of the test bar is 2mm / min for directional solidification to optimize eutectic Alloy structure and improve its performance.

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Abstract

The invention discloses an electron beam floating zone melting directional solidification preparation method for a Fe-Al-Ta composite material. The method includes: adding trace of high-ductility refractory metal Ta into a Fe-Al intermetallic compound, preparing eutectic alloy or non-eutectic alloy, and performing eutectic reaction to obtain a Fe(Al, Ta) / Fe2Ta(Al) eutectic composite material or Fe-Al-Ta non-eutectic composite material, wherein the Laves phase Fe2Ta(Al) has a hexagonal C14 structure (with a melting point higher than 700 DEG C) and is high in strength when the temperature is higher than 1000 DEG C, and fragility improvement and strength improvement of the material are realized due to intergrowth compounding of the matrix phase Fe(Al, Ta) and the Laves phase Fe2Ta(Al) in melt. A theoretical basis is provided for Laves phase alloy composition design and novel high-temperature structural material research and development, and a significant academic value in development of application of the electron beam floating zone melting directional solidification technique is achieved.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and relates to the improvement of the brittleness of Fe-Al intermetallic compounds, and in particular to a method for preparing Fe-Al-Ta composite material by smelting and directional solidification in the electron beam suspension zone. Background technique [0002] In addition to metal bonds, intermetallic compounds also have some covalent bonds. They have both the good plasticity of metals and the good high-temperature strength of ceramics. They are a class of high-temperature structural materials with great potential. Fe-Al intermetallic compound (Fe 3 Al, FeAl, FeAl 2 , Fe 2 Al 5 FeAl 3 ) Is one of the most typical representatives. The raw materials use two basic natural elements, Fe and Al, which are low in price. In addition, the Fe-Al intermetallic compound has a long-range ordered crystal structure, and the bonding between atoms has both metal bonds and Covalent bond and ionic bond, the uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B21/04C30B28/08
CPCC30B21/04C30B28/08C30B29/52
Inventor 崔春娟任驰强问亚岗王珮王松苑
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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