Corson Alloy Strip Cube Orientation Control for Press Accuracy
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Solution Overview
Problem
Miniaturization of connectors leads to poor dimensional accuracy and product yield due to variations in pitch and dispersion of coarse Cube orientation grains, resulting in unstable press fracture surfaces and residual stress affecting dimensional accuracy.
Innovation Solution
A Corson alloy with optimized Cube orientation grain area ratio and size, controlled through X-ray diffraction and SEM-EBSD methods, ensuring 1.0≤I(200)/I0(200)≤5.0 and 2-10% area ratio of Cube orientation, along with average grain size ratios and inclusion of elements like Ni, Co, Si, Sn, Zn, Mg, Cr, and Mn for improved bending workability and pressing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Cube orientation grains are increased to improve bending workability, then bending workability is improved, but dimensional accuracy after press-working deteriorates due to dispersion of coarse grains
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area ratio of Cube orientation grains (5-30%) and their average crystal grain size (10-50 μm) within specific ranges. This quantitative control transforms the qualitative relationship between grain structure and press-working dimensional accuracy, resolving the contradiction by optimizing both bending workability and dimensional stability through defined parameter boundaries
Solution Approach 2:
The patent implements local quality by controlling the distribution and size of Cube orientation grains specifically in the rolling parallel cross section. Rather than uniform grain structure throughout, the invention focuses on local grain characteristics (area ratio and average size) in the critical pressing region, allowing optimized bending workability while preventing coarse grain dispersion that causes dimensional inaccuracies
2Strength
If high strength is achieved through precipitation hardening, then strength is improved, but bending workability deteriorates due to intermetallic compound formation
Solution Approach 1:
The patent resolves this contradiction through parameter changes by controlling the alloy composition within specific ranges (Ni: 0.5-3.0%, Co: 0.1-2.0%, Si: 0.1-1.5%) and heat treatment parameters (solutionizing temperature: 800-950°C, aging temperature: 400-600°C). These controlled parameter changes enable precipitation hardening to achieve high strength while maintaining adequate bending workability by preventing excessive intermetallic compound formation
Solution Approach 2:
The patent applies local quality by creating a controlled distribution of intermetallic compounds through specific heat treatment parameters. The solutionizing and aging treatments produce a localized precipitation structure that provides strength enhancement without creating excessive hardening that would compromise bending workability, achieving balanced properties through localized microstructural control
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 achieves enhanced bending workability and dimensional accuracy after press-working, stabilizing press fracture surfaces and reducing residual stress, thereby improving product yield and quality.
Implementation Method 1
The rolling material has a surface satisfying the relationship: 1.0≤I(200)/I0(200)≤5.0; wherein an area ratio of Cube orientation {100} is from 2 to 10% in EBSD measurement of a rolling parallel cross section
Implementation Method 2
wherein an area ratio of Cube orientation {100} is from 2 to 10% in EBSD measurement of a rolling parallel cross section; and wherein a ratio: (an average crystal grain size of Cube orientation {100} of the rolling parallel cross section)/(an average crystal grain size of the rolling parallel cross section) is from 0.75 to 1.5
Implementation Method 3
The Corson alloy has intermetallic compounds such as Ni—Si, Co—Si, and Ni—Co—Si precipitated in a Cu matrix, and also has high strength, high conductivity, and good bending workability
Data Source
AI summary
Provided is a Corson alloy having improved bending workability and also having high dimensional accuracy after press-working. A copper alloy strip which is a rolling material, the rolling material containing from 0 to 5.0% by mass of Ni or from 0 to 2.5% by mass of Co, the total amount of Ni+Co being from 0.2 to 5% by mass; from 0.2 to 1.5% by mass of Si, the balance being copper and unavoidable impurities, wherein the rolling material has a surface satisfying the relationship: 1.0≤I(200)/I0(200)≤5.0; wherein an area ratio of Cube orientation {100} <001> is from 2 to 10% in EBSD measurement of a rolling parallel cross section; and wherein a ratio: (an average crystal grain size of Cube orientation {100} <001> of the rolling parallel cross section)/(an average crystal grain size of the rolling parallel cross section) is from 0.75 to 1.5.