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Al-Mg2Si-based composite and preparation method thereof

A composite material and matrix technology, which is applied in the field of metal materials, can solve the problem that high temperature performance needs to be improved, and achieve the effects of improving high temperature performance and simple preparation process.

Inactive Publication Date: 2017-08-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, Al-Mg 2 Si composite materials have huge market potential and broad application prospects in automotive and other fields, but the disadvantage is that the high temperature performance needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Raw materials are prepared according to the following mass percentages: 72.5% pure aluminum, 9.5% pure magnesium, 5.5% pure silicon, 7.5% aluminum-copper master alloy, 5% aluminum-nickel master alloy, wherein the aluminum-copper master alloy contains The amount of copper is 20% and the nickel content of the aluminum-nickel master alloy is 10%;

[0022] (2) Melt pure aluminum to 750°C in a melting furnace, add pure silicon first, stir for 5 minutes after it is completely melted, and then press pure magnesium into the bottom of the melt for 10 minutes when the temperature drops to 600°C, then add 0.5wt. %C 2 C1 6 Degassing and slag removal;

[0023] (3) Increase the temperature to 750° C., add 10% aluminum-copper master alloy and 10% aluminum-nickel master alloy, keep warm and stir for 10 minutes, and then cast into an ingot.

[0024] Prepared Al 3 CuNi reinforced Al-Mg 2 The composition of the Si-based composite material is:

[0025]

Embodiment 2

[0027] (1) Raw materials are prepared according to the following mass percentages: 75% pure aluminum, 9.5% pure magnesium, 5.5% pure silicon, 10% aluminum-copper master alloy, 10% aluminum-nickel master alloy, wherein the aluminum-copper master alloy contains The amount of copper is 30% and the nickel content of the aluminum-nickel master alloy is 10%;

[0028] (2) Melt pure aluminum to 800°C in a smelting furnace, add pure silicon first, stir for 10 minutes after it is completely melted, and then press pure magnesium into the bottom of the melt for 10 minutes when the temperature drops to 650°C, then add 0.5wt. %C 2 C1 6 Degassing and slag removal;

[0029] (3) Then raise the temperature to 800° C., add 7.5% aluminum-copper master alloy and 5% aluminum-nickel master alloy, keep warm and stir for 20 minutes, and then cast into an ingot.

[0030] Prepared Al 3 CuNi reinforced Al-Mg 2 The composition of the Si-based composite material is:

[0031]

Embodiment 3

[0033] (1) Prepare raw materials according to the following mass percentages: 62.5% pure aluminum, 9.5% pure magnesium, 5.5% pure silicon, 15% aluminum-copper master alloy, 7.5% aluminum-nickel master alloy, wherein the aluminum-copper master alloy contains The amount of copper is 30% and the nickel content of the aluminum-nickel master alloy is 20%;

[0034] (2) Melt pure aluminum to 800°C in a smelting furnace, add pure silicon first, stir for 10 minutes after it is completely melted, and then press pure magnesium into the bottom of the melt for 10 minutes when the temperature drops to 650°C, then add 0.5wt. %C 2 C1 6 Degassing and slag removal;

[0035] (3) Raise the temperature to 850° C., add 15% aluminum-copper master alloy and 7.5% aluminum-nickel master alloy, keep warm and stir for 30 minutes, then cast into an ingot.

[0036] Prepared Al 3 CuNi reinforced Al-Mg 2 The composition of the Si-based composite material is:

[0037]

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Abstract

The invention belongs to the field of metal materials and particularly relates to an Al3CuNi and Al7Cu4Ni composite-reinforced Al-Mg2Si-based composite and a preparation method thereof. Mg and Si in the Al-based composite react to generate the Mg2Si phase, and the Mg2Si phase is separated out firstly in the setting process. Copper and nickel in an aluminium-copper intermediate alloy and an aluminium-nickel intermediate alloy are dissolved and then react with aluminium to generate the Al3CuNi phase firstly, then part of Al3CuNi is transformed into the Al7Cu4Ni phase through the peritectic reaction, no special equipment is required in the preparation process, and the preparation technology is relatively simple. The high-temperature performance of the composite is improved through introduction of the heat-resistant Al3CuNi and Al7Cu4Ni phases while the original Mg2Si reinforcing effect of the composite is kept, and the composite is suitable for large-scale production and application.

Description

[0001] Technical field: [0002] The invention belongs to the field of metal materials, in particular to an Al 3 CuNi and Al 7 Cu 4 Ni composite reinforced Al-Mg 2 Si-based composite material and preparation method thereof. [0003] Background technique: [0004] Due to Mg 2 Si has the advantages of low density, high melting point, high hardness, high elastic modulus, etc., and it can be used as a reinforcement of aluminum matrix composites, thus playing the role of second phase particle reinforcement. With additional ceramic particles SiC, TiC, TiB 2 、Al 2 o 3 Compared with other composite materials, Mg 2 Si reinforced aluminum matrix composites due to its reinforcing phase Mg 2 Si is formed in situ during the solidification process, so it has good compatibility with the matrix, clean interface, firm combination, good thermal stability, and more uniform reinforcement distribution, relatively simple manufacturing process, low cost, and good machinability of composite m...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C32/00C22C1/03C22C1/06C22C1/10
CPCC22C1/03C22C1/06C22C1/1036C22C21/08C22C32/0078
Inventor 李冲孙宜琳刘永长余黎明李会军
Owner TIANJIN UNIV
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