Cu-Ti Alloy Sheet Density Reduction via Intermediate Cold Rolling
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Solution Overview
Problem
Current methods for producing Cu-Ti-based copper alloy sheets fail to effectively reduce density while maintaining high strength, electrical conductivity, bending workability, and stress relaxation properties.
Innovation Solution
A production process involving solution treatment and intermediate cold rolling twice, followed by an aging treatment, is used to control the microstructure and precipitate formation, resulting in a sheet material with reduced density and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If Al is added to reduce density, then density is reduced, but strength and bending workability deteriorate
Solution Approach 1:
The invention changes the processing parameters (solution treatment temperature, intermediate cold rolling reduction ratio, aging treatment temperature) to control the microstructure and precipitate distribution, enabling the material to achieve both low density and high strength simultaneously
Solution Approach 2:
The invention creates a composite microstructure with fine precipitates dispersed in the matrix, combining the light weight advantage of Al with the strength enhancement from controlled precipitate formation
2Weight of moving object
If Al is added to reduce density, then density is reduced, but bending workability deteriorates
Solution Approach 1:
The invention optimizes processing parameters including solution treatment temperature (800-950°C), intermediate cold rolling reduction ratio (10-30%), and aging treatment temperature (200-400°C) to control precipitate size and distribution, achieving both low density and good bending workability
3Ease of manufacture
If conventional production process is used, then manufacturing simplicity is maintained, but density reduction and property balance are insufficient
Solution Approach 1:
The invention divides the production process into distinct stages (solution treatment, intermediate cold rolling, aging treatment) with specific parameter ranges for each stage, making the complex process controllable and reproducible
Solution Approach 2:
The invention specifies precise parameter ranges for each processing step (solution treatment temperature 800-950°C, intermediate cold rolling reduction ratio 10-30%, aging treatment temperature 200-400°C) to achieve the desired microstructure and properties
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 process achieves a Cu-Ti-based copper alloy sheet with balanced high strength, electrical conductivity, bending workability, and stress relaxation properties, while reducing the density to 8.53 g/cm³ or less.
Implementation Method 1
a solution treatment + intermediate cold rolling
Implementation Method 2
intermediate cold rolling
Implementation Method 3
aging treatment after performing a step of 'a solution treatment + intermediate cold rolling' twice
Implementation Method 4
controlling to the vicinity of a temperature at which the maximum hardness is obtained
Data Source
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AI summary
[Object] To provide a Cu-Ti-based copper alloy sheet material having a strength, an electrical conductivity, bending workability, and a stress relaxation property all at high levels in a good balance, and also having a reduced density (specific gravity). [Means for Solution] A copper alloy sheet material composed of, in mass%, Ti: 1.0 to 5.0%, A1: 0.5 to 3.0%, Ag: 0 to 0.3%, B: 0 to 0.3%, Be: 0 to 0.15%, Co: 0 to 1.0%, Cr: 0 to 1.0%, Fe: 0 to 1.0%, Mg: 0 to 0.5%, Mn: 0 to 1.5%, Nb: 0 to 0.5%, Ni: 0 to 1.0%, P: 0 to 0.2%, Si: 0 to 0.5%, Sn: 0 to 1.5%, V: 0 to 1.0%, Zn: 0 to 2.0%, Zr: 0 to 1.0%, S: 0 to 0.2%, rare earth elements: 0 to 3.0%, and the balance substantially being Cu, wherein a maximum width of a grain boundary reaction type precipitate existing region is 1000 nm or less, a KAM value when a boundary with a crystal orientation difference of 15° or more measured by EBSD (step size: 0.1 µm) is rewarded as a crystal grain boundary is 3.0° or less, and a tensile strength in a rolling direction is 850 MPa or more.