Copper-Titanium Alloy Strength and Bending Workability
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Solution Overview
Problem
Current copper-titanium alloys face a challenge in achieving a balance between strength and bending workability, particularly in the context of miniaturized electronic components, where increased Ti concentration fluctuations are beneficial but not fully optimized.
Innovation Solution
A copper-titanium alloy with a Ti concentration of 2.0 to 4.0% and the addition of 0 to 0.5% by mass of elements like Fe, Co, Mg, Si, Ni, Cr, Zr, Mo, V, Nb, Mn, B, and P, subjected to specific heat treatments and cold rolling processes to enhance the range and standard deviation of Ti concentration, resulting in improved strength and bending workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rolling reduction ratio in cold rolling is increased to increase dislocation density and improve strength after aging treatment, then strength is improved, but bending workability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by adding specific third elements (Fe, Co, Ni, Si, Cr, Zr, Mo, V, Nb, Mn, B, or P) in controlled amounts (0.01-0.5 mass%) to the copper-titanium alloy. This compositional parameter change enables the alloy to achieve both high strength (≥1000 MPa after aging) and good bending workability by modifying the precipitation behavior and dislocation interaction mechanisms during cold rolling and aging processes.
2Ease of operation
If techniques are used to achieve coexistence of strength and bending workability by adding third elements or controlling impurity elements, then both strength and bending workability can be improved, but the alloy composition becomes more complex
Solution Approach 1:
The invention specifies precise parameter ranges for third element additions (0.01-0.5 mass%) and Ti concentration (2.0-4.0 mass%) to achieve the desired balance between strength and bending workability while maintaining controlled composition complexity.
Solution Approach 2:
The invention allows selective addition of specific third elements based on the desired properties. Different third elements can be chosen to optimize particular characteristics (e.g., Fe for strength, Si for bending workability), enabling tailored alloy design for specific application requirements rather than requiring all elements simultaneously.
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 alloy achieves a higher balance of strength and bending workability, enabling the production of reliable electronic components with increased Ti concentration fluctuations, as demonstrated by enhanced 0.2% yield strength and bending performance without cracking.
Implementation Method 1
When a supersaturated solid solution of Ti which is a solute atom is formed by solution treatment, and the supersaturated solid solution is subjected to relatively long-time heat treatment at low temperatures, a modulated structure which is a periodic change of Ti concentration will develop in a matrix phase by spinodal decomposition, thereby improving strength.
Implementation Method 2
as the rolling reduction ratio in cold rolling is increased, dislocation introduced is increased to thereby increase dislocation density, which increases nucleation sites contributing to the precipitation and can increase the strength after aging treatment.
Data Source
AI summary
There is provided a copper-titanium alloy with large fluctuations in Ti concentration. The copper-titanium alloy for electronic components contains 2.0 to 4.0% by mass of Ti and, as a third element, 0 to 0.5% by mass in total of one or more selected from a group consisting of Fe, Co, Mg, Si, Ni, Cr, Zr, Mo, V, Nb, Mn, B, and P, with a balance being copper and unavoidable impurities, wherein when crystal grains having <100> orientation in a section parallel to a rolling direction are subjected to area analysis of Ti concentration in a matrix phase, a difference between a maximum Ti concentration and a minimum Ti concentration is 5 to 16% by mass.