Al Alloy Wire Rod Composition for Impact Resistance
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Solution Overview
Problem
Aluminum alloy wire rods used in electric wiring structures, particularly in transportation vehicles, face challenges in achieving sufficient impact resistance and bending fatigue resistance while maintaining strength, elongation, and conductivity, especially when used as extra fine wires with diameters less than or equal to 0.5 mm.
Innovation Solution
An aluminum alloy wire rod composition with specific ranges of Mg, Si, Fe, and other elements, along with controlled heat treatment processes, is used to suppress segregation and enhance interface bonding, resulting in improved impact resistance and bending fatigue resistance while maintaining strength and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If pure aluminum wire rod is used to achieve lightweighting, then weight is reduced, but impact resistance and bending fatigue resistance deteriorate
Solution Approach 1:
The patent uses aluminum alloy wire rod containing specific elements (Mg: 0.03-1.0 mass%, Si: 0.03-1.0 mass%, Mn: 0.03-1.0 mass%, Fe: 0.03-0.5 mass%) instead of pure aluminum. This composite alloying approach maintains the lightweight advantage while improving mechanical properties through elemental combinations that enhance strength and fatigue resistance.
Solution Approach 2:
The patent applies specific heat treatment parameters (solution treatment at 400-600°C for 0.5-4 hours, aging treatment at 100-250°C for 0.5-48 hours) to transform the microstructure and properties of the aluminum alloy wire rod. These parameter changes optimize the balance between weight, strength, and fatigue resistance.
2Strength
If alloying elements are added to increase tensile strength, then strength is improved, but conductivity decreases due to solution phenomenon and intermetallic compound formation
Solution Approach 1:
The patent precisely controls alloying element concentrations within specific ranges (Mg: 0.03-1.0 mass%, Si: 0.03-1.0 mass%, Mn: 0.03-1.0 mass%, Fe: 0.03-0.5 mass%) to optimize the balance between strength and conductivity. This parameter control prevents excessive intermetallic compound formation while maintaining sufficient tensile strength.
Solution Approach 2:
The patent creates local microstructural features through controlled alloying and heat treatment, where specific regions have optimized properties for both strength and conductivity. The solution treatment and aging treatment create a microstructure with dispersed precipitates that provide strength while maintaining overall electrical conductivity.
3Length of moving object
If wire rod diameter is reduced to achieve smaller wire sizes, then weight and size are reduced, but impact resistance and bending fatigue resistance deteriorate
Solution Approach 1:
The patent uses aluminum alloy with specific elemental compositions to compensate for the reduced cross-sectional area of extra fine wires (0.1-0.5 mm diameter). The alloying elements create microstructural features that enhance strength and fatigue resistance, allowing thin wires to maintain sufficient mechanical performance.
Solution Approach 2:
The patent applies optimized heat treatment parameters (solution treatment temperature and time, aging treatment temperature and time) specifically for extra fine wire dimensions. These parameter changes ensure that the microstructure develops appropriately for small diameters, maintaining impact and fatigue resistance despite the reduced size.
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 an aluminum alloy wire rod with enhanced impact resistance and bending fatigue resistance, allowing for smaller wire sizes with high tensile strength, suitable for applications in transportation vehicles and industrial robots, while maintaining conductivity equivalent to existing products.
Implementation Method 1
controlled heat treatment processes, is used to suppress segregation and enhance interface bonding
Implementation Method 2
suppress segregation and enhance interface bonding, resulting in improved impact resistance and bending fatigue resistance
Data Source
AI summary
An aluminum alloy wire rod has a composition consisting of 0.1-1.0 mass % Mg; 0.1-1.0 mass % Si; 0.01-1.40 mass % Fe; 0.000-0.100 mass % Ti; 0.000-0.030 mass % B; 0.00-1.00 mass % Cu; 0.00-0.50 mass % Ag; 0.00-0.50 mass % Au; 0.00-1.00 mass % Mn; 0.00-1.00 mass % Cr; 0.00-0.50 mass % Zr; 0.00-0.50 mass % Hf; 0.00-0.50 mass % V; 0.00-0.50 mass % Sc; 0.00-0.50 mass % Co; 0.00-0.50 mass % Ni; and the balance being Al and incidental impurities, wherein at least one or none of Ti, B, Cu, Ag, Au, Mn, Cr, Zr, —Hf, V, Sc, Co and Ni is contained in the composition. A dispersion density of an Mg2Si compound having a particle size of 0.5 μm to 5.0 μm is less than or equal to 3.0×10−3 particles/μm2. In a sectional structure, a concentration of each of Si and Mg other than a compound is less than or equal to 2.00 mass %.