A kind of in-situ self-generated al4la whisker reinforced magnesium-based composite material and its preparation method

An in-situ self-generated and composite material technology, applied in the field of magnesium-based composite materials, can solve the problems of poor interfacial bonding force and compatibility of composite materials, improve the comprehensive mechanical properties of materials, increase the nucleation rate, and refine The effect of alloy grains

Inactive Publication Date: 2015-12-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of particles, the interface bonding force and compatibility of the prepared composite material are not very good, and the propagation of microcracks in the composite material is mainly in the matrix and YAl 2 at the particle / matrix interface

Method used

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  • A kind of in-situ self-generated al4la whisker reinforced magnesium-based composite material and its preparation method
  • A kind of in-situ self-generated al4la whisker reinforced magnesium-based composite material and its preparation method
  • A kind of in-situ self-generated al4la whisker reinforced magnesium-based composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition (mass percentage) of the composite material is: 4%La, 3%Al, 4%Li, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0025] The melting and casting process for preparing the alloy is as follows: first, weigh the materials according to the proportion, put the Mg, Al, Li, Mg-30%La master alloy into the crucible to prepare for melting, then vacuumize the melting furnace to a vacuum degree of 4Pa, and then fill into argon protective gas. After preheating the melting furnace, keep it warm for 35 minutes. When the alloy in the crucible is fully melted, cast it with a cooling rate of 7°C / s. The resulting castings were homogenized at 400°C for 8 hours and then air-cooled.

[0026] The in-situ self-generated Al in the as-cast state obtained in this embodiment 4 The microstructure of La whisker reinforced Mg-based composites is as follows: (1) The composite exhibits uniform fine grains and a high volume fra...

Embodiment 2

[0029] The chemical composition (mass percentage) of the composite material is: 4%La, 3%Al, 8%Li, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0030] The melting and casting process for preparing the alloy is as follows: first, weigh the materials according to the proportion, put the Mg, Al, Li, Mg-30% La master alloy into the crucible to prepare for melting, then vacuumize the melting furnace until the vacuum degree reaches 3Pa, and then fill into argon protective gas. After preheating the melting furnace, keep it warm for 37 minutes. When the alloy in the crucible is fully melted, cast it with a cooling rate of 6°C / s. The resulting castings were homogenized at 350°C for 10 hours and then air-cooled.

[0031] The in-situ self-generated Al in the as-cast state obtained in this embodiment 4 The microstructure of La whisker reinforced Mg-based composites is as follows: (1) The composite exhibits uniform fine grains and a hig...

Embodiment 3

[0034] The chemical composition (mass percentage) of the composite material is: 8% La, 6% Al, the total amount of impurity elements Fe, Cu, Ni, Si is less than 0.03%, and the balance is Mg.

[0035] The melting and casting process for preparing the alloy is as follows: firstly weigh the materials according to the proportion, put the Mg, Al, Li, Mg-30% La master alloy into the crucible to prepare for melting, then vacuumize the melting furnace until the vacuum degree reaches 2Pa, and then fill into argon protective gas. After preheating the melting furnace, keep it warm for 40 minutes. When the alloy in the crucible is fully melted, cast it with a cooling rate of 4°C / s. The resulting castings were homogenized at 420°C for 6 hours and then air-cooled.

[0036] The in-situ self-generated Al in the as-cast state obtained in this embodiment 4 The microstructure of La whisker reinforced Mg-based composites is as follows: (1) The composite exhibits uniform fine grains and a high vo...

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Abstract

The invention provides an in-situ synthesized Al4La crystal whisker reinforced magnesium matrix composite material and a preparation method. The preparation method comprises the following steps: mixing the following alloy elements in percentage by mass: 3.0 to 10.0 percent of Al, 3.0 to 12.0 percent of La and the balance of Mg; smelting the alloy elements, preserving heat, standing, cooling, and performing high-temperature homogenization treatment to obtain the in-situ synthesized Al4La crystal whisker reinforced magnesium matrix composite material. By the preparation method, the in-situ synthesized intermetallic compound Al4La which is fine, distributed uniformly and bonded well with a matrix interface, and has a very obvious reinforcing effect can be obtained. The in-situ synthesized Al4La crystal whisker reinforced magnesium matrix composite material has a relatively simple preparation process and low production cost, and is suitable for large-batch industrial production.

Description

technical field [0001] What the present invention relates to is a kind of magnesium-based composite material, what the present invention also relates to is a kind of preparation method of magnesium-based composite material, specifically a kind of in-situ self-generated Al 4 La whisker reinforced magnesium matrix composite material and preparation method. Background technique [0002] Green new magnesium alloy materials have been used in automobiles, communications, computers and aviation and other fields. Many countries call it the most important strategic material in the 21st century. Experts predict that in the next few decades, the global demand for magnesium alloy products will increase rapidly. However, magnesium alloys have low strength and poor heat resistance, which limit the further application and development of magnesium alloys. Therefore, in order to expand the application space of magnesium alloys, it is necessary to further tap the performance potential of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/04C22C49/14C22C47/00
Inventor 张密林史红岩冷哲张景怀江风春王国伟
Owner HARBIN ENG UNIV
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