Method for Manufacturing High Strength Ultra-Fine/Nano-Structured Al/Aln or Al Alloy/Aln Composite Materials

Inactive Publication Date: 2009-08-06
DYNAMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]As apparent from the above description, the present invention provides aluminum / aluminum nitride or aluminum alloy / aluminum nitride composite materials having superior mechanical strength at ambient and elevated temperature, and heat resistance to those fabricated by conventional powder metallurgy process or liquid processes, and their fabrication method using mechanical milling / alloying process.

Problems solved by technology

Currently aluminum matrix composite materials reinforced with aluminum oxide, silicon carbide, and etc show poor interface characteristics, such as decohesion of re-inforcements, reaction with matrix phases, and poor wettability.
These problems limit the usage of aluminum matrix composite materials.
However, conventional processes, such as conventional powder metallurgy process, directed melt nitridation process, and liquid process in which aluminum nitride reinforcements are directly added to aluminum melts, show some problems like poor interface characteristics caused by the oxide layer of aluminum nitride particles, inhomogeneous distribution of reinforcements, and difficulty in controlling the reinforcement size.

Method used

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  • Method for Manufacturing High Strength Ultra-Fine/Nano-Structured Al/Aln or Al Alloy/Aln Composite Materials
  • Method for Manufacturing High Strength Ultra-Fine/Nano-Structured Al/Aln or Al Alloy/Aln Composite Materials
  • Method for Manufacturing High Strength Ultra-Fine/Nano-Structured Al/Aln or Al Alloy/Aln Composite Materials

Examples

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example 1

[0029]In accordance with the present invention, the mixture of aluminum powders and master alloy powders with the composition of Al-50 wt. % Mg are used as starting materials. Initial composition of starting materials is Al-4 wt. % Mg. Then mechanical alloying process is conducted in ammonia gas atmosphere with the condition in which the final volume fraction of aluminum nitride is 25%. The final bulk product of Al-4 wt. % Mg / 25 vol. % AlN composite materials is manufactured through cold compacting process, degassing process and hot extrusion process.

example 2

[0030]In accordance with the present invention, the mixture of aluminum powders and titanium powders are used as starting materials. Initial composition of starting materials is Al-5 wt. % Ti. Then mechanical alloying process is conducted in ammonia gas atmosphere with the condition in which the final volume fraction of aluminum nitride is 25%. The final bulk product of Al-5 wt. % Ti / 25 vol. % AlN composite materials is manufactured through cold compacting process, degassing process and hot extrusion process.

example 3

[0031]In accordance with the present invention, the mixture of aluminum powders and zinc powders are used as starting materials. Initial composition of stalling materials is Al-5 wt. % Zn. Then mechanical alloying process is conducted in ammonia gas atmosphere with the condition in which the final volume fraction of aluminum nitride is 25%. The final bulk product of Al-5 wt. % Zn / 25 vol. % AlN composite materials is manufactured through cold compacting process, degassing process and hot extrusion process.

[0032]The compression tests are conducted at room temperatures and 200° C., and their results are shown in table 1. From examples 1 to 3, the aluminum alloy / aluminum nitride composite materials have superior yield strength to those of conventional aluminum alloys and aluminum matrix composite materials. Especially, Al-4 wt. % Mg / 25 vol. % AlN composite material shows the drastic increase of yield strength at room temperature. These results of the aluminum / aluminum nitride composites...

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Abstract

The present invention relates to the a method for manufacturing high strength ultra-fine / nano-structured aluminum / aluminum nitride or aluminum alloy / aluminum nitride composites using mechanical milling or mechanical alloying process which is conducted in the nitride-forming atmosphere such as nitrogen gas (N), ammonia gas (NH) or mixed gas including both gases, subsequent heat treatment process, and hot consolidation process. Also, high strength ultra-fine / nano-structured Al / ALN or Al alloy / ALN composite materials fabricated by the method of present invention have superior mechanical strength and heat resistance to those fabricated by conventional powder metallurgy process or liquid processes.

Description

TECHNICAL FIELD[0001]The present invention relates to high strength ultra-fine / nano-structured aluminum / aluminum nitride or aluminum alloy / aluminum nitride composite materials, and their manufacturing process.BACKGROUND ART[0002]Currently aluminum matrix composite materials reinforced with aluminum oxide, silicon carbide, and etc show poor interface characteristics, such as decohesion of re-inforcements, reaction with matrix phases, and poor wettability. These problems limit the usage of aluminum matrix composite materials. Aluminum nitride is a potential re-inforcement for aluminum matrix composite materials having high elastic modulus, high thermal conductivity, good thermal stability, chemical stability and sound wettability with aluminum.[0003]However, conventional processes, such as conventional powder metallurgy process, directed melt nitridation process, and liquid process in which aluminum nitride reinforcements are directly added to aluminum melts, show some problems like p...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00B22F1/142
CPCB22F1/0085B22F2003/208B22F2998/00B22F2998/10B22F2999/00C22C32/0068C22C1/1084B22F1/0044B22F9/04B22F3/14B22F3/20B22F2201/02B22F1/142B22F1/00B22F1/07B82Y40/00
InventorSHINYU, SEUNG HOON
OwnerDYNAMATERIALS