Aluminum Alloy Conductor Wire Crimp Reliability
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Solution Overview
Problem
Aluminum alloy wires used in electric wiring structures for transportation vehicles face issues with abnormal crystal grain growth during heat treatment, leading to inconsistent plastic deformation and crimp reliability problems, especially when used as fine wires with diameters less than or equal to 1.5 mm.
Innovation Solution
A manufacturing method and composition for aluminum alloy conductor wires containing Mg, Si, Fe, and Ni, where the cooling rate and temperature increasing rate during solution heat treatment are controlled to uniformly disperse Fe-based compounds, preventing abnormal grain growth and enhancing crimp reliability while maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum alloy wire rod is used to achieve lightweighting, then weight is reduced, but tensile strength and durability are insufficient
Solution Approach 1:
The patent uses aluminum alloy containing specific elements (Mg: 0.03-1.0 mass%, Si: 0.03-1.0 mass%, Fe: 0.01-0.5 mass%, Mn: 0.01-1.0 mass%, Ti: 0.01-0.1 mass%, B: 0.001-0.05 mass%) to create a composite material structure that combines lightweight properties with enhanced tensile strength through alloying effects and intermetallic compound formation
Solution Approach 2:
The patent changes the chemical composition parameters of the aluminum alloy by precisely controlling the content of each alloying element, and changes the microstructure parameters through controlled cooling rates (1-20°C/s) and heat treatment processes to achieve optimal balance between weight and strength
2Strength
If alloying elements are added to increase tensile strength, then strength is improved, but conductivity decreases due to solution phenomenon and intermetallic compounds
Solution Approach 1:
The patent optimizes the concentration parameters of alloying elements within specific ranges to achieve the right balance between strength and conductivity, and controls the size and distribution parameters of intermetallic compounds through processing conditions
Solution Approach 2:
The patent creates local intermetallic compound phases distributed throughout the aluminum matrix, where these localized strengthened regions provide tensile strength while the overall aluminum matrix maintains good conductivity
3Weight of moving object
If fine wire with diameter ≤1.5mm is manufactured, then lightweighting is achieved, but crimp reliability and plastic deformation consistency are poor due to abnormal grain growth
Solution Approach 1:
The patent performs preliminary grain refinement during the casting and rolling stages by controlling the cooling rate (1-20°C/s) to establish a fine initial grain structure, and applies intermediate heat treatment before final wire drawing to prevent abnormal grain growth during subsequent processing
Solution Approach 2:
The patent controls the temperature and time parameters of heat treatment processes, and adjusts the cooling rate parameters during casting and rolling to achieve uniform grain size and suppress abnormal grain growth in fine wires
4Strength
If solution heat treatment and aging treatment are applied to increase strength, then tensile strength is improved, but abnormal grain growth occurs leading to inconsistent plastic deformation
Solution Approach 1:
The patent performs preliminary grain refinement through controlled cooling during casting and rolling, and applies intermediate heat treatment to establish a stable grain structure before final aging treatment, preventing abnormal grain growth during strength-enhancing treatments
Solution Approach 2:
The patent optimizes the temperature and time parameters of solution heat treatment and aging treatment to achieve the desired strength increase while maintaining grain size uniformity, and controls the cooling rate to prevent abnormal grain growth
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 ensures stable plastic deformation and improved crimp reliability of aluminum alloy conductor wires, even when used as fine wires, by suppressing abnormal grain growth and homogenizing crystal grain size, thus enhancing mechanical and electrical connection reliability.
Implementation Method 1
controlling a component composition and a manufacturing process, abnormal growth of crystal grains upon recrystallization is uniformly suppressed using a particle pinning effect
Implementation Method 2
a density of a compound having a particle size of 0.5 to 5.0 μm and containing Fe is 1 to 300 particles/10000 μm 2
Implementation Method 3
an alloyed material containing various additive elements added thereto is capable of achieving an increased tensile strength, but conductivity may decrease due to a solution phenomenon of the additive elements into aluminum
Data Source
AI summary
Provided is an aluminum alloy conductor wire used as a conductor of an electrical wiring structure that has improved crimping reliability while ensuring an excellent strength. An aluminum alloy conductor wire having a composition comprising Mg: 0.1 mass% to 1.0 mass%, Si: 0.1 mass% to 1.20 mass%, Fe: 0.01 mass% to 1.40 mass%, Ti: 0 mass% to 0.100 mass%, B: 0 mass% to 0.030 mass%, Cu: 0 mass% to 1.00 mass%, Ag: 0 mass% to 0.50 mass%, Au: 00 mass% to 0.50 mass%, Mn: 0 mass% to 1.00 mass%, Cr: 0 mass% to 1.00 mass%, Zr: 0 mass% to 0.50 mass%, Hf: 0 mass% to 0.50 mass%, V: 0 mass% to 0.50 mass%, Sc: 0 mass% to 0.50 mass%, Co: 0 mass% to 0.50 mass%, Ni: 0 mass% to 0.50 mass%, and the balance: Al and inevitable impurities, where Ti, B, Cu, Ag, Au, Mn, Cr, Zr, Hf, V, Sc, Co and Ni are arbitrary additive components of which at least one component may be contained or none of the components may be contained. A density of a compound having a particle size of 0.5 to 5.0 µm and containing Fe is 1 to 300 particles/10000 µm2.