Aluminum Alloy Conductor Grain Boundary Segregation Control
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Solution Overview
Problem
Aluminum alloy conductors used in electric wiring structures for transportation vehicles face challenges in achieving improved 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, due to segregation of Mg and Si components at grain boundaries.
Innovation Solution
An aluminum alloy conductor composition with controlled Mg and Si concentrations at grain boundaries, combined with specific heat treatment processes, including solution heat treatment and aging, to prevent segregation and enhance mechanical properties and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If pure aluminum is used as conductor material, then weight is reduced and conductivity is maintained, but tensile strength and impact resistance are insufficient
Solution Approach 1:
The patent uses aluminum alloy containing Mg and Si elements to create a composite material system. The base aluminum provides low density and good conductivity, while Mg and Si additions enhance tensile strength and impact resistance through solid solution strengthening and precipitate formation, resolving the contradiction between weight reduction and strength enhancement.
Solution Approach 2:
The patent optimizes the concentration parameters of alloying elements (Mg: 0.1-1.0 mass%, Si: 0.1-1.0 mass%) and controls microstructural parameters (grain size, phase distribution) to simultaneously achieve low density, high conductivity, and improved mechanical properties, resolving the contradiction between weight and strength requirements.
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 the concentration parameters of alloying elements (Mg ≤1.0 mass%, Si ≤1.0 mass%) to optimize the balance between strength and conductivity. By limiting the total alloy content and optimizing individual element concentrations, the patent minimizes the adverse effects on conductivity while achieving sufficient tensile strength enhancement.
Solution Approach 2:
The patent creates local variations in composition and microstructure through controlled segregation patterns, where Mg and Si elements are distributed to provide local strengthening without excessive bulk intermetallic formation that would harm overall conductivity, resolving the contradiction between localized strength enhancement and global conductivity maintenance.
3Strength
If Mg and Si content is increased to improve strength, then tensile strength is enhanced, but segregation at grain boundaries occurs reducing impact resistance and bending fatigue resistance
Solution Approach 1:
The patent optimizes the concentration parameters of Mg and Si (each 0.1-1.0 mass%) to achieve sufficient tensile strength while preventing excessive segregation. By controlling the alloy composition within specific ranges and optimizing heat treatment parameters, the patent balances bulk strengthening with grain boundary integrity, resolving the contradiction between tensile strength enhancement and impact resistance maintenance.
Solution Approach 2:
The patent applies solution heat treatment before aging to pre-distribute alloy elements uniformly throughout the matrix, preventing subsequent segregation during service. This preliminary uniform distribution of Mg and Si atoms reduces the tendency for grain boundary segregation that would otherwise harm impact resistance and bending fatigue resistance while maintaining tensile strength.
4Strength
If solution heat treatment and aging treatment are applied to increase strength, then tensile strength is improved, but elongation becomes insufficient in extra fine wires
Solution Approach 1:
The patent optimizes the concentration parameters of alloying elements (Mg: 0.1-1.0 mass%, Si: 0.1-1.0 mass%) and controls microstructural parameters (grain size, phase distribution) to achieve a balanced microstructure that provides both high tensile strength through precipitate strengthening and sufficient elongation through appropriate grain refinement and phase distribution, resolving the contradiction between strength and elongation in extra fine wires.
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 conductor with enhanced impact resistance and bending fatigue resistance, maintaining strength and elongation equivalent to existing products, suitable for use in transportation vehicles and industrial robots, with a smaller wire size due to increased tensile strength.
Implementation Method 1
an aluminum alloy conductor having a composition consisting of 0.1 mass% to 1.0 mass% Mg; 0.1 mass% to 1.0 mass% Si... wherein a dispersion density of an Mg 2 Si compound having a particle size of 0.5 μm to 5.0 μm is less than or equal to 3.0 × 10 -3
Implementation Method 2
a dispersion density of an Mg 2 Si compound having a particle size of 0.5 μm to 5.0 μm is less than or equal to 3.0 × 10 -3
Implementation Method 3
the strength of the 6xxx series aluminum alloy wire rod can be increased by applying a solution treatment and an aging treatment
Data Source
AI summary
An aluminum alloy conductor or the like used as a conductor of an electric wiring structure that has an improved impact resistance and bending fatigue resistance while ensuring strength, elongation and conductivity equivalent to the related art products, even when used as an extra fine wire having a diameter of strand of less than or equal to 0.5 mm is provided. An aluminum alloy conductor of the present invention has a composition consisting of 0.10-1.00 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 A1 and incidental impurities, wherein 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 x 10-3 particles/µm2, and each of Si and Mg at a grain boundary between crystal grains of a parent phase has a concentration of less than or equal to 2.00 mass%.