Magnetic Disc Aluminum Blank Composition for Smoothness and Proof Stress
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Solution Overview
Problem
Existing methods for producing aluminum alloy disc blanks for magnetic discs face challenges in reducing protruding defects and achieving high proof stress, as they struggle to control factors other than intermetallic compounds and do not sufficiently enhance smoothness and strength.
Innovation Solution
An aluminum alloy disc blank with a specific composition of Mg 3.40 to 3.90 mass % and a conductivity of 36.0% IACS or higher, incorporating additional elements like Cu, Zn, Fe, Si, Cr, Be, Sr, Na, and P, which helps in forming a solid solution that reduces protruding defects and enhances smoothness and proof stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aluminum alloy compositions are used to achieve high proof stress, then strength is improved, but protruding defects increase and smoothness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Mg content within 3.40 to 3.90 mass % and maintaining conductivity at 36.0% IACS or higher. This specific parameter range optimizes the balance between proof stress and surface smoothness, preventing protruding defects while ensuring sufficient strength for magnetic disc applications.
Solution Approach 2:
The patent employs composite material principles by incorporating multiple alloying elements (Cu, Zn, Fe, Si, Cr, Be, Sr, Na, P) in controlled amounts alongside Mg. This creates a complex aluminum alloy composition that synergistically improves both mechanical properties and surface quality, resolving the contradiction between strength and smoothness.
2Manufacturing precision
If intermetallic compounds are reduced to improve smoothness, then surface quality is improved, but proof stress insufficiently increases
Solution Approach 1:
The patent changes the approach from merely reducing intermetallic compounds to actively controlling alloy composition parameters. By setting Mg content at 3.40 to 3.90 mass % and conductivity at 36.0% IACS or higher, the patent achieves both smooth surfaces and high proof stress through compositional optimization rather than simple defect reduction.
Solution Approach 2:
The patent applies local quality by differentiating the roles of various alloying elements: Mg primarily enhances strength and surface quality, while other elements (Cu, Zn, Fe, Si, Cr, etc.) are controlled at lower levels to minimize intermetallic formation. This localized functional assignment resolves the contradiction between smoothness and strength.
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 solution effectively reduces protruding defects and improves the smoothness and proof stress of the aluminum alloy disc blank, ensuring both enhanced processing and performance in magnetic disc applications.
Implementation Method 1
incorporating additional elements like Cu, Zn, Fe, Si, Cr, Be, Sr, Na, and P, which helps in forming a solid solution that reduces protruding defects and enhances smoothness and proof stress
Implementation Method 2
a conductivity of the aluminum alloy disc blank for a magnetic disc is 36.0% IACS or higher
Data Source
AI summary
An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Mg: 3.40 to 3.90 mass % with the balance being A1 and inevitable impurities, wherein a conductivity of the aluminum alloy disc blank is 36.0% IACS or higher.