Beta Titanium Alloy Composition for Stable BCC Processing
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Solution Overview
Problem
Conventional titanium alloys face challenges in achieving a single phase body-centered cubic (bcc) solid solution structure below the solidus temperature, which limits their production processes and properties such as strength and ductility, especially at elevated temperatures.
Innovation Solution
A titanium alloy composition with a range of 2.0 - 6.0 wt.% Al, 4.0 - 12.0 wt.% V, and 1.0 - 5.0 wt.% Fe, along with optional incidental elements, is developed to achieve a bcc solid solution structure, allowing for conventional ingot processing, powder metallurgy, and additive manufacturing, while controlling cooling rates to form a crack-free ingot with precipitate phases for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional titanium alloy compositions are used, then the alloy can be processed using standard methods, but the alloy cannot achieve a single phase bcc solid solution structure below the solidus temperature
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of alloying elements (Al: 2.0-6.0 wt.%, V: 4.0-12.0 wt.%, Fe: 1.0-5.0 wt.%) to transform the phase structure from conventional alpha or alpha-beta mixtures to a single phase bcc solid solution structure below the solidus temperature, while maintaining processability through conventional methods
2Strength
If the alloy composition is optimized for bcc structure, then mechanical properties and thermal stability improve, but the freezing range narrows causing restricted hot cracking and microsegregation
Solution Approach 1:
The patent utilizes phase transitions by designing the alloy composition to achieve a narrow freezing range that promotes restricted hot cracking during solidification, while the bcc phase structure provides the desired mechanical properties and thermal stability, balancing manufacturing precision with performance
3Strength
If aluminum content is increased to enhance strength, then tensile yield strength improves, but the beta transus temperature increases reducing thermal stability
Solution Approach 1:
The patent applies parameter changes by optimizing the aluminum content within a specific range (2.0-6.0 wt.%) and balancing it with vanadium (4.0-12.0 wt.%) and iron (1.0-5.0 wt.%) to achieve the desired strength while controlling the beta transus temperature to maintain thermal stability for high-temperature applications
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 new alloy exhibits improved mechanical properties, including higher tensile yield strength and elongation, and thermal stability, making it suitable for various applications like aerospace and automotive components with reduced microsegregation and hot cracking.
Implementation Method 1
a narrow equilibrium freezing range (e.g., for restricting microsegregation during solidification)
Implementation Method 2
Some small fraction of alpha phase (hcp) may be present through a solid-state transformation at a low temperature in the alloy
Data Source
AI summary
New beta-style (bcc) titanium alloys are disclosed. The new alloys generally include 2.0 - 6.0 wt. % Al, 4.0 - 12.0 wt. % V, and 1.0 - 5.0 wt. % Fe, the balance being titanium, any optional incidental elements, and unavoidable impurities. The new alloys may realize an improved combination of properties as compared to conventional titanium alloys.