Titanium Alloy Sheet Composition for Bendable Mirror-Finished Eyewear
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Solution Overview
Problem
Existing titanium alloys face challenges in achieving high workability, particularly bendability and mirror finishing properties, which are essential for modern precision products.
Innovation Solution
A titanium alloy sheet with specific chemical composition and microstructural control, including 80% α phase, average grain size ≤20.0 μm, and controlled crystal grain orientations, enhances workability and mirror finishing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hardness of titanium alloy is increased to improve mirror finishing properties, then polishing quality improves, but workability and ability to form precise shapes deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters (Al: 1.0-7.0%, Fe: 0.1-1.7%, O: 0.05-0.30%, N: 0.000-0.080%, C: 0.000-0.100%, H: 0.000-0.013%, Cu: 0.00-2.00%, Si: 0.00-0.30%) and microstructural parameters (α phase area ratio: 80% or more, average grain size: 20.0 μm or less, crystal grain orientation ratios) to achieve a balance between hardness for mirror finishing and workability for precise shaping
Solution Approach 2:
The patent creates a composite microstructure consisting of predominantly α phase (80% or more area ratio) with specific grain size control (20.0 μm or less) and controlled crystal grain orientations (αt-30: 20-50%, αc-30: 8-30%). This composite microstructure provides both the hardness needed for mirror finishing and the ductility required for workability
2Ease of manufacture
If pure titanium is used to ensure good workability, then ease of manufacture improves, but mirror finishing properties deteriorate due to low hardness and large dimples
Solution Approach 1:
The patent changes the compositional parameters by adding specific amounts of alloying elements (Al: 1.0-7.0%, Fe: 0.1-1.7%, O: 0.05-0.30%, etc.) to pure titanium, which increases the hardness and improves mirror finishing properties while maintaining adequate workability through controlled composition ranges
Solution Approach 2:
The patent transforms pure titanium into a composite alloy material with a controlled microstructure (80% or more α phase, average grain size 20.0 μm or less, specific crystal grain orientations) that combines the workability of pure titanium with the mirror finishing properties of harder alloys
3Manufacturing precision
If titanium alloy hardness is increased to suppress crystal patterns and irregularities on the surface, then surface quality improves, but bendability and precise shape formation become difficult
Solution Approach 1:
The patent applies parameter changes by controlling the chemical composition (particularly O: 0.05-0.30%, N: 0.000-0.080%, C: 0.000-0.100%) and microstructural parameters (grain size: 20.0 μm or less, α phase ratio: 80% or more, crystal grain orientation: αt-30 20-50%) to achieve a hardness level that suppresses surface irregularities while preserving bendability
Solution Approach 2:
The patent creates a composite microstructure with predominantly α phase (80% or more area ratio) and controlled grain size (20.0 μm or less) and crystal grain orientations (αt-30: 20-50%, αc-30: 8-30%), which provides a balanced combination of surface quality and bendability
Data Source
AI summary
A titanium alloy sheet includes, as a chemical composition, by mass %: Al: 1.00% to 7.00%; Fe: 0.10% to 1.70%; O: 0.05% to 0.30%; N: 0.000% to 0.080%; C: 0.000% to 0.100%; H: 0.000% to 0.013%; Cu: 0.00% to 2.00%; Si: 0.00% to 0.30%; and a remainder Ti and impurities, wherein a microstructure includes, by an area ratio, 80% or more of an a phase, an average grain size of the α phase is 20.0 μm or less, an area ratio of crystal grains αt-30 in which an angle formed between a c-axis and a thickness direction of the titanium alloy sheet is within 30 degrees in the α phase is 20% to 50%, and an area ratio of crystal grains in which an average value of GOS (grain orientation spread) measured using EBSD (electron backscatter diffraction) is 2.0 or less in the αt-30 is 80% or more.