Extruded Aluminum Wire Grain Control for Uniform Strength
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Solution Overview
Problem
Extruded aluminum wires exhibit low strength and non-uniform strength distribution along their length due to trace amounts of alloying elements, leading to variations in strength at the start and completion of extrusion.
Innovation Solution
An extruded aluminum wire with controlled grain sizes and kernel average misorientation within grains, achieved by specific alloying element additions and controlled extrusion conditions, ensures uniform strength distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trace amounts of alloying elements are added to high-purity aluminum, then electrical conductivity is improved, but strength decreases and strength uniformity along the length direction deteriorates
Solution Approach 1:
The patent changes the physical parameter of grain size to a specific range (15-50 μm) to compensate for the strength loss caused by alloying elements. By controlling grain size through extrusion parameters (temperature, speed, ratio), the material achieves both high electrical conductivity from pure aluminum and sufficient strength through grain boundary strengthening mechanisms.
2Productivity
If conventional extrusion parameters are used, then production efficiency is maintained, but strength uniformity along the length direction deteriorates due to temperature variations
Solution Approach 1:
The patent applies different temperature conditions to different regions of the extrusion process. By maintaining higher temperature at the extrusion die (container) relative to the billet, the patent ensures uniform grain structure and strength properties throughout the entire length of the extruded wire, including the tail portion that would otherwise be affected by cooling.
3Strength
If grain size is reduced to increase strength, then strength increases, but the complexity of controlling grain size uniformity throughout the extrusion increases
Solution Approach 1:
The patent identifies and controls key extrusion parameters (billet temperature, container temperature, extrusion speed, extrusion ratio) to achieve the desired grain size range. By establishing specific parameter ranges and their interrelationships, the patent simplifies the control of grain size uniformity while maintaining high strength properties throughout the extruded product.
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 results in an aluminum wire with high strength and uniformity along its length, suitable for applications like semiconductor wiring and superconducting stabilization materials.
Implementation Method 1
extrusion technology
Implementation Method 2
average grain size measured by electron backscatter diffraction is 15 to 50 μm
Data Source
AI summary
Disclosed is an extruded aluminum wire including: Fe, Cu, Ti, Mn, Mg, Cr, B, Ga, V and Zn in the total content of 0.01% by mass or less, and one or more components selected from the group consisting of Ni, Y and Si, with the balance being Al and inevitable impurities, wherein, in a cross-section perpendicular to the longitudinal direction of the extruded wire, an average grain size measured by electron backscatter diffraction is 15 to 50 μm, respectively, in both a central measurement region including a center point of the cross-section and a peripheral measurement region in contact with the outer periphery of the cross-section.