Cu-Be Alloy Co Content Control for Mechanical Strength
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Solution Overview
Problem
Cu—Be alloys with added Co exhibit insufficient mechanical strength, necessitating a method to enhance their mechanical properties.
Innovation Solution
A Cu—Be alloy with a Co content of 0.005% to 0.12% by mass, where the number of Cu—Co-based compound particles with a particle size of 0.1 μm or more is five or less per 10 μm×10 μm field of view, is produced through a process involving solution annealing and subsequent cold working followed by age hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Co is added to Cu-Be alloy to suppress grain boundary reaction and discontinuous precipitation, then reliability of mechanical strength is improved, but mechanical strength remains insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Co content within 0.005% to 0.12% by mass and limiting coarse Cu-Co compound particles to five or less per 10μm×10μm field of view. This quantitative control of compositional parameters resolves the contradiction by finding the optimal range where Co suppresses grain boundary reactions without forming excessive coarse particles that would compromise mechanical strength.
Solution Approach 2:
The patent applies local quality by creating a non-uniform distribution of Cu-Co compound particles, specifically limiting coarse particles (≥0.1μm) to five or less in any 10μm×10μm field of view while allowing finer particles to exist. This localized control of particle quality and distribution enables the alloy to benefit from Co addition while maintaining high mechanical strength by avoiding fracture initiation sites.
2Stability of the object's composition
If Co content is increased to prevent coarsening of crystal grains during casting and hot working, then stability of microstructure is improved, but mechanical strength becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by optimizing the Co content parameter within a specific range (0.005% to 0.12% by mass) that provides sufficient grain boundary stabilization during casting and hot working while preventing excessive formation of coarse Cu-Co compound particles. This precise parameter control ensures both microstructure stability and high mechanical strength.
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 approach results in a Cu—Be alloy with increased mechanical strength, achieving tensile strengths of 1,700 MPa or more and elongation at break of 1.5% or more, effectively suppressing the formation of coarse particles that act as fracture initiation points.
Implementation Method 1
a solution annealing treatment step of subjecting a Cu—Be alloy raw material containing 0.005% to 0.12% by mass of Co and 1.60% to 1.95% by mass of Be to solution annealing treatment
Implementation Method 2
when a Cu—Be alloy is subjected to strong working under cold conditions, followed by age hardening treatment, mechanical strength can be increased
Data Source
AI summary
A Cu—Be alloy according to the present invention is a Co-containing Cu—Be alloy, in which the Co content is 0.005% to 0.12% by mass, and the number of Cu—Co-based compound particles having a particle size of 0.1 μm or more that can be confirmed on a TEM image at a magnification of 20,000 is five or less in a field of view of 10 μm×10 μm. Furthermore, a method for producing a Cu—Be alloy according to the present invention includes a solution annealing treatment step of subjecting a Cu—Be alloy raw material containing 0.005% to 0.12% by mass of Co and 1.60% to 1.95% by mass of Be to solution annealing treatment to obtain a solution-annealed material.