High-Strength Aluminum Alloy with Fibrous Microstructure
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Solution Overview
Problem
Aluminum alloy materials face challenges in achieving high strength comparable to iron-based or copper-based metals, with existing methods resulting in poor corrosion resistance, stress corrosion cracking, and insufficient industrial scalability due to processability issues and limitations in crystal grain size.
Innovation Solution
An aluminum alloy with a specific composition (Mg: 0.50% to 6.0%, Fe: 0% to 1.50%, Si: 0% to 0.15%, and additional elements like Cu, Ag, Zn, Ni, Ti, Co, Au, Mn, Cr, V, Zr, and Sn) that forms a fibrous metallographic structure with crystal grains aligned in one direction and an average size of 310 nm or less, enhancing tensile strength and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high concentration of Mg is added to increase strength, then tensile strength is improved, but processability deteriorates
Solution Approach 1:
The patent optimizes the Mg content parameter to a specific range (0.50-6.0% by mass) to achieve the desired balance between strength and processability. This parameter change resolves the contradiction by finding the optimal concentration that provides sufficient strength while maintaining manufacturability.
2Strength
If 2000-series or 7000-series aluminum alloys are used to increase strength, then tensile strength is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent changes the alloy composition parameters by limiting Cu to 2.0% or less and Zn to 2.0% or less, while optimizing Mg content. This parameter adjustment achieves high strength while preventing the poor corrosion resistance associated with conventional 2000-series and 7000-series alloys.
3Strength
If conventional aluminum alloys are used to maintain good electrical and heat conductivities, then conductivities are preserved, but strength is insufficient
Solution Approach 1:
The patent optimizes the alloy composition parameters within specific ranges: Mg (0.50-6.0%), Fe (0.05-1.50%), Si (0.05-0.15%), and other elements (0.05-2.0%). These parameter changes achieve high strength (400 MPa or more) while maintaining satisfactory electrical and heat conductivities.
4Adaptability or versatility
If metal powder is used for three-dimensional structure formation, then desired shapes can be formed, but explosion risk increases when powder is excessively fine
Solution Approach 1:
The patent replaces metal powder with aluminum alloy materials having a fibrous metallographic structure, which eliminates the explosion risk associated with fine metal powder while maintaining the capability to form desired three-dimensional shapes through techniques like knitting, weaving, tying, jointing, or connecting.
5Strength
If ECAP method or cold working at room temperature is used to form fine crystal grains, then strength is improved, but industrial scale production becomes difficult
Solution Approach 1:
The patent changes the approach from mechanical processing methods (ECAP, cold working) to compositional control, specifying optimal ranges for alloying elements. This parameter change enables the production of high-strength aluminum alloys (400 MPa or more) at industrial scale without requiring specialized small-scale processing equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The alloy achieves a high strength comparable to iron-based or copper-based metals, with a 0.2% yield strength of 400 MPa or more and Vickers hardness of 125 or more, while improving grain boundary corrosion resistance and fatigue characteristics, making it suitable for industrial applications.
Implementation Method 1
a technique for using a solid solution element has been widely used as a method for increasing strength of aluminum alloy. For example, Patent Literature 1 discloses a method in which high strength is achieved by containing Mg at high concentrations.
Implementation Method 2
the aluminum alloy material has a fibrous metallographic structure in which crystal grains extend so as to be aligned in one direction, and an average value of sizes perpendicular to longitudinal direction of the crystal grains is 310 nm or less
Data Source
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AI summary
The aluminum alloy material of the present invention has an alloy composition consisting of Mg: 0.50% by mass or more and 6.0% by mass or less, Fe: 0% by mass or more and 1.50% by mass or less, Si: 0% by mass or more and 1.0% by mass or less, one or more selected from Cu, Ag, Zn, Ni, Ti, Co, Au, Mn, Cr, V, Zr and Sn: 0% by mass or more and 2.0% by mass or less in total, with the balance being A1 and inevitable impurities, wherein the aluminum alloy material has a fibrous metallographic structure in which crystal grains extend so as to be aligned in one direction, and an average value of sizes perpendicular to longitudinal direction of the crystal grains is 310 nm or less in a cross section parallel to the one direction.