Shape Memory Material Processing for Multiple Transformation Temperatures
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Solution Overview
Problem
Existing methods for processing shape memory materials, such as nitinol, struggle to create materials with multiple transformation temperatures and often result in brittle structures or poor mechanical properties due to the difficulty in controlling composition and structure during processing.
Innovation Solution
A method involving localized application of energy, such as laser treatment, to alter the local chemistry and structure of shape memory materials, allowing for the creation of materials with multiple transformation temperatures by vaporization and re-solidification, which can embed additional memories or alter properties like pseudo-elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional processing methods are used to create shape memory materials with multiple transformation temperatures, then the material composition and structure can be altered, but the resulting material exhibits brittle structures and poor mechanical properties
Solution Approach 1:
The patent applies localized laser processing to specific regions of the shape memory material rather than treating the entire material uniformly. This localized approach allows different regions to have different transformation temperatures while preserving the overall mechanical integrity of the material. The laser energy is concentrated in predetermined areas to induce phase transitions and compositional changes only where needed, avoiding the brittleness that would result from global processing.
Solution Approach 2:
The material is divided into multiple regions with distinct transformation temperatures through selective laser processing. Each processed region acts as an independent functional segment with its own transformation characteristics. This segmentation allows the material to exhibit multiple transformation temperatures simultaneously while maintaining the mechanical properties of the unprocessed or minimally processed base material.
2Temperature
If conventional processing methods are used to alter material composition, then transformation temperature can be adjusted, but the processing control and composition precision are insufficient
Solution Approach 1:
The patent replaces conventional mechanical or thermal processing methods with laser-based energy delivery. The laser provides precise spatial and temporal control over energy input, enabling accurate control of local composition and transformation temperature. The laser parameters (power, speed, pulse duration) can be precisely controlled to achieve the desired compositional changes without the imprecision of conventional processing methods.
Solution Approach 2:
The patent utilizes changes in laser processing parameters (energy density, pulse duration, scanning speed) to precisely control the local composition and transformation temperature. By adjusting these parameters, the process can be optimized to achieve specific compositional outcomes in different regions of the material, providing the manufacturing precision that conventional methods cannot achieve.
3Adaptability or versatility
If energy is applied to alter local chemistry of shape memory materials, then additional memories and properties can be embedded, but the processing complexity increases
Solution Approach 1:
The laser processing system serves multiple functions: it heats the material to induce phase transitions, vaporizes selective components to alter local composition, and controls the cooling rate to achieve desired microstructures. This multi-functionality allows the embedding of multiple transformation temperatures and properties through a single processing approach, reducing the need for multiple separate processing steps and associated complexity.
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
This approach enables the production of shape memory materials with multiple transformation temperatures, enhancing their functionality and mechanical properties while maintaining the super-elasticity of the material.
Implementation Method 1
alter the local chemistry and structure of shape memory materials, allowing for the creation of materials with multiple transformation temperatures by vaporization and re-solidification
Implementation Method 2
applying energy to a predetermined portion of the material in a controlled manner such that the local chemistry of the predetermined portion is altered
Data Source
AI summary
A method for treating a material comprising: applying energy to a predetermined portion of the material in a controlled manner such that the local chemistry of the predetermined portion is altered to provide a predetermined result. When the material is a shape memory material, the predetermined result may be to provide an additional memory to the predetermined portion or to alter the pseudo-elastic properties of the shape memory material. In other examples, which are not necessarily restricted to shape memory materials, the process may be used to adjust the concentration of components at the surface to allow the formation of an oxide layer at the surface of the material to provide corrosion resistance; to remove contaminants from the material; to adjust surface texture; or to generate at least one additional phase particle in the material to provide a nucleation site for grain growth, which in turn, can strengthen the material.