Ti-Zr-Nb Alloy Flexures for Optical Mounts
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Solution Overview
Problem
Titanium alloys face challenges in flexures and compliant structures due to lack of sufficient flexibility and excessive actuation effort, limited by conventional post-processing and a lack of database information on phase equilibria and thermochemistry of ternary titanium alloys, such as titanium-zirconium-niobium (Ti—Zr—Nb), which hinders their use in advanced compliant mounts and mechanisms.
Innovation Solution
A titanium-zirconium-niobium alloy with a composition of about 13.5 to 14.5 wt.% zirconium and 18 to 19 wt.% niobium is used to form compliant forged structural elements, offering high strength, low modulus, and excellent ductility, balancing structural requirements for flexible compliant elements, and is processed using methods like vacuum induction melting and hot forging to achieve congruent melting and uniform microstructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional titanium alloys are used for flexures and compliant structures, then structural strength is maintained, but sufficient flexibility is not achieved and excessive actuation effort is required
Solution Approach 1:
The patent modifies the material parameters by creating a specific ternary alloy composition (Ti-Zr-Nb) with controlled weight percentages of zirconium (13.5-14.5 wt.%) and niobium (18-19 wt.%) to achieve optimal balance between strength and flexibility. This parameter change enables the material to exhibit both high strength and low modulus of elasticity, resolving the contradiction between structural strength and flexibility.
Solution Approach 2:
The patent develops a composite titanium alloy system by combining titanium with zirconium and niobium in specific proportions. This composite material approach creates a ternary alloy that leverages the beneficial properties of each constituent: titanium provides strength, zirconium enhances ductility and flexibility, and niobium improves mechanical properties and temperature stability, thereby achieving both strength and flexibility simultaneously.
2Ease of manufacture
If conventional post-processing methods are used for titanium alloys, then manufacturing is simplified, but phase equilibria and thermochemistry data are insufficient for optimizing advanced compliant mounts
Solution Approach 1:
The patent performs preliminary research and characterization of the Ti-Zr-Nb alloy system to establish comprehensive phase equilibrium and thermochemistry data before actual manufacturing. By conducting preliminary studies on phase diagrams, transformation temperatures, and material properties, the invention creates a knowledge base that guides subsequent manufacturing processes, ensuring optimal material performance in compliant mounts.
3Manufacturing precision
If flexures are designed to maintain optical alignment, then positioning precision is achieved, but stress on optical components increases
Solution Approach 1:
The patent changes the material parameters by selecting an alloy with optimized modulus of elasticity and strength characteristics. The specific Ti-Zr-Nb composition provides a low modulus of elasticity that reduces stress transmission to optical components while maintaining sufficient stiffness for alignment, thereby resolving the contradiction between positioning precision and stress on optical elements.
Solution Approach 2:
The patent applies local quality by designing flexures with specific geometric configurations (such as bipod struts, circular bodies with attachment arms) that distribute stress locally. The structural design incorporates features like curved surfaces and optimized cross-sections that reduce stress concentration at critical locations, protecting optical components while maintaining alignment precision.
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 titanium-zirconium-niobium alloy demonstrates reduced bending moment and local mounting pressure, maintaining optical surface alignment and returning to shape after shock or vibration, with modified stiffness and strength, suitable for aerospace and optical applications.
Implementation Method 1
The titanium-zirconium-niobium alloy has a congruent melting temperature of about 1750 to about 1800° C.
Implementation Method 2
Flexures are elastic elements that provide precisely controlled motion under static and dynamic mechanical loads and thermal stress effects
Data Source
AI summary
A flexure including a bipod strut pair extending from a base and a titanium-zirconium-niobium alloy, which includes titanium, about 13.5 to about 14.5 wt. % zirconium, and about 18 to about 19 weight % (wt. %) niobium. The titanium-zirconium-niobium alloy has a congruent melting temperature of about 1750 to about 1800° Celsius (° C.).