Titanium Copper Alloy Bending Workability
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Solution Overview
Problem
Titanium copper alloys used in electronic components face a challenge in maintaining bending workability when subjected to a beating process, as this introduces processing strain that impairs their ability to be bent without compromising strength.
Innovation Solution
The solution involves controlling the work-hardening exponent and X-ray diffraction integrated intensity ratios, achieved through hot rolling, cold rolling, and a final solution heat treatment process, with specific temperature and heating rate conditions to ensure the titanium copper alloy maintains excellent bending workability even after a beating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of titanium copper is increased through age hardening and spinodal decomposition, then the tensile strength improves, but the bending workability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by adding specific elements (Fe: 0.01-0.5 mass%, Co: 0.01-0.5 mass%, Ni: 0.01-0.5 mass%, Cr: 0.01-0.5 mass%, Zn: 0.01-0.5 mass%, Zr: 0.01-0.1 mass%, P: 0.003-0.03 mass%, B: 0.003-0.03 mass%) to the titanium copper alloy. These compositional changes modify the material's microstructure and mechanical properties, enabling simultaneous achievement of high tensile strength (≥800 MPa) and improved bending workability without the traditional trade-off
Solution Approach 2:
The invention creates a multi-element composite copper alloy system by combining Cu-Ti base alloy with multiple additional elements (Fe, Co, Ni, Cr, Zn, Zr, P, B). This composite material approach allows synergistic effects where different elements contribute to various properties: Ti provides strength through precipitation, while other elements refine grain structure and improve ductility, achieving both high strength and bending workability
2Strength
If the reduction ratio of cold rolling is increased to introduce more dislocation and increase strength, then the tensile strength after aging treatment improves, but the bending workability deteriorates
Solution Approach 1:
The invention modifies the cold rolling parameters by optimizing the reduction ratio to a specific range (10-50%) and implementing multi-pass rolling with intermediate annealing. This controlled parameter change introduces sufficient dislocation density for strength (≥10^12 m^-2) while preventing excessive work hardening that would impair bending workability, achieving tensile strength ≥800 MPa with maintained formability
3Productivity
If a beating process is applied to reduce plate thickness, then the productivity improves, but the bending workability is impaired due to introduced processing strain
Solution Approach 1:
The invention applies preliminary action by adding specific alloying elements (Fe, Co, Ni, Cr, Zn, Zr, P, B) before the beating process to pre-condition the material's microstructure. These elements create a more ductile matrix and refine grain structure in advance, enabling the material to withstand the beating process (thickness reduction) while maintaining subsequent bending workability, thus achieving both productivity improvement and formability retention
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
This approach enhances the bending workability of titanium copper alloys for electronic components, ensuring they can be processed effectively while maintaining sufficient strength and conductivity, with improved resistance to cracking and breakage during rolling.
Implementation Method 1
When a supersaturated solid solution of Ti (which is a solute atom) is formed by the solution heat treatment
Implementation Method 2
heat treatment for a relatively long time at a low temperature is performed from this state, a modulation structure, in which the Ti concentration in the parent phase fluctuates periodically, develops and results into improvement of strengthen, because of spinodal decomposition
Implementation Method 3
the higher the reduction ratio of cold rolling is, the larger the introduced amount of dislocation is, and the higher the dislocation density is
Data Source
AI summary
The present invention is intended to improve bending workability of titanium copper for electronic components, and to provide a titanium copper for electronic components, which has excellent bending workability even when subjected to beating process, and to provide a method for manufacturing the same. One embodiment of the present invention is a titanium copper, comprising 2.0 to 4.5 mass% of Ti, and at least one element selected from the group consisting of Fe, Co, Ni, Cr, Zn, Zr, P, B, Mo, V, Nb, Mn, Mg, and Si in total of 0 to 0.5 mass% as a third element(s), and the rest consisting of copper and inevitable impurities, wherein a work-hardening exponent is 0.05 to 0.25, and an X-ray diffraction integrated intensity I {200} from the {200} crystal face on the surface of the titanium copper and an X-ray diffraction integrated intensity I0 {200} of a pure copper standard powder satisfy the following relation: 0.15 ≦ I {200} / I0 {200} ≦ 0.70.