Thixotropic Alloy Deposition for Wrought-Like Metal Microstructure
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Solution Overview
Problem
Current additive manufacturing techniques face limitations in producing microstructure properties similar to wrought alloy metals, struggle with high deposition rates, and require extensive post-processing to achieve desired microstructure properties.
Innovation Solution
The method involves injecting a gas composition with inert and interstitial gases into a molten thixotropic metal alloy above its liquidus temperature to create a saturated slurry, which is then deposited through an extruder, allowing for the formation of a metal matrix composite and friction stir welding of layers to achieve improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Directed Energy Deposition (DED) fusion or metal injection molding is used, then additive manufacturing can be achieved, but microstructure properties similar to wrought alloy metals cannot be produced and extensive post processing is required
Solution Approach 1:
The patent changes the temperature parameter by maintaining the metal alloy above its liquidus temperature throughout the deposition process. This parameter change enables the metal to remain in a thixotropic state, allowing for high deposition rates while producing microstructure properties similar to wrought alloy metals, thereby resolving the contradiction between manufacturing precision and productivity
Solution Approach 2:
The patent uses composite feedstock consisting of metal alloy powder mixed with a polymer binder to create a thixotropic slurry. This composite material approach enables the material to be deposited in a controlled manner while achieving desired microstructure properties, resolving the contradiction between manufacturing precision and productivity
2Productivity
If typical additive manufacturing processes are used, then components can be manufactured, but high deposition rates cannot be achieved and extensive post processing operations are required
Solution Approach 1:
The patent maintains the metal alloy temperature above the liquidus temperature during deposition, changing the thermal parameter to keep the material in a thixotropic state. This enables high deposition rates while producing components with acceptable microstructure properties that require minimal post processing, thereby resolving the contradiction between productivity and ease of manufacture
Solution Approach 2:
The patent enables continuous deposition of the thixotropic metal alloy slurry without interruption or cooling between layers. This continuous process achieves high deposition rates while the thixotropic nature of the material ensures proper layer bonding and microstructure formation, reducing the need for post processing operations
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 components with enhanced mechanical properties, reduced material requirements, and improved robustness, suitable for high-melting-point metals like titanium and stainless steel alloys, while minimizing post-processing needs and cycle times.
Implementation Method 1
injecting a gas composition including an inert gas and an interstitial gas into the molten metal melt to form a saturated slurry
Implementation Method 2
a thixotropic metal alloy; the saturated slurry being at a temperature above a liquidus temperature of the thixotropic metal alloy
Implementation Method 3
friction stir welding the plurality of layers together
Data Source
AI summary
A method may comprise: placing a probe in a molten metal melt comprising a thixotropic metal alloy; injecting a gas into the molten metal melt to form a saturated slurry, the saturated slurry being at a temperature above a liquidus temperature of the thixotropic metal alloy after injecting the gas; removing the probe from the molten metal melt; and depositing the molten metal melt through an extruder of an additive manufacturing system.