Age-Hardening Aluminum Alloy Slide Fastener Elements
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Solution Overview
Problem
Conventional aluminum alloys used in slide fasteners lack sufficient strength and abrasion resistance, leading to issues such as black powder generation and weakened engagement, which compromises their practical use, especially in applications requiring strength like pants.
Innovation Solution
The use of an age-hardening type aluminum alloy with a specific composition (AlaSibCucMgd) and heat treatment process to form fine precipitates, enhancing strength and abrasion resistance while maintaining workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aluminum alloys are used for slide fastener elements, then the elements can be manufactured with good workability, but the strength and abrasion resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the alloy composition parameters (Si: 0.4-0.9%, Cu: 0.15-0.8%, Mg: 0.8-2.0%) and heat treatment parameters (aging temperature: 100-200°C, aging time: 1-12 hours) to achieve the desired balance between strength and workability. This systematic parameter optimization enables the aluminum alloy to form fine precipitates that enhance strength while maintaining manufacturability
Solution Approach 2:
The patent creates a composite microstructure within the aluminum alloy by forming fine precipitates of Mg-Si intermetallic compounds dispersed throughout the matrix. This internal composite structure, achieved through controlled aging heat treatment, provides both enhanced strength and abrasion resistance while preserving the base aluminum alloy's good workability and formability
2Strength
If the strength is improved by increasing solid solution and cold rolling, then the strength increases, but the workability decreases and heat treatment is required which lowers strength
Solution Approach 1:
The patent applies preliminary action by pre-forming the fine Mg-Si precipitates through controlled aging heat treatment before final shaping operations. This preliminary precipitation hardening creates a microstructure that maintains both strength and workability during subsequent forming operations, eliminating the need for post-forming heat treatment that would compromise strength
Solution Approach 2:
The patent changes the physical state and microstructure of the alloy through controlled aging parameters (temperature: 100-200°C, time: 1-12 hours) to achieve optimal precipitate formation. This parameter control allows the material to maintain a balance between strength and formability during cold working operations without requiring additional heat treatment steps
3Productivity
If conventional aluminum alloys are used, then the elements can be produced, but they generate black abrasion powders that dirty clothing and weaken engagement
Solution Approach 1:
The patent creates a composite microstructure with fine Mg-Si precipitates dispersed in the aluminum matrix that significantly enhances abrasion resistance. This internal reinforcement prevents the generation of black powder during use, as the fine precipitates strengthen the material at the microstructural level, reducing wear and preventing contaminant generation that would otherwise occur with conventional aluminum alloys
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 provides slide fastener elements with high strength and improved abrasion resistance, preventing strength reduction and maintaining engagement integrity.
Implementation Method 1
an age-hardening type aluminum alloy with a specific composition (AlaSibCucMgd) and heat treatment process to form fine precipitates, enhancing strength and abrasion resistance
Data Source
AI summary
Elements for a slide fastener are provided, which have high strength and improved abrasion resistance. More particularly, an element for a slide fastener includes as a base material, an aluminum alloy having a composition represented by a general formula: AlaSibCucMgd in which a, b, c and d are expressed in percentage by mass, a denotes a balance, 0.4≤b≤0.9, 0.15≤c≤0.8, 0.8≤d≤2.0, and unavoidable impurity elements may be contained; and the aluminum alloy containing a precipitate containing Mg and Si.