Multi-Principal Element Alloy Directed Energy Deposition
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Solution Overview
Problem
The high cost and complexity of producing multi-principal element alloys due to expensive manufacturing processes and material handling challenges, along with difficulties in achieving precise equiatomic compositions and microstructural repeatability, hinder their widespread adoption in industries requiring high strength, durability, and resistance to extreme conditions.
Innovation Solution
A method using directed energy deposition (DED) and additive manufacturing (AM) to form multi-principal element alloys by selecting targeted compositions, determining feedstock relative feed rates, and analyzing functionally graded material articles to achieve empirical feedstock rates, allowing for precise control of chemical composition and microstructure, thereby forming alloys with desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional techniques (plasma arc melting, gas atomization) are used to form multi-principal element alloys, then the alloys can be produced with complex concentrated structures, but the production cost increases significantly and manufacturing complexity increases
Solution Approach 1:
The patent replaces conventional mechanical mixing and plasma arc melting processes with a directed energy deposition system that uses a laser or electron beam to melt and deposit feedstock materials layer by layer. This substitution of mechanical/thermal processes with precise energy beam control enables equiatomic composition control while reducing manufacturing complexity and cost.
Solution Approach 2:
The patent changes the fundamental processing parameters by using directed energy deposition with controlled feedstock delivery rates. By adjusting the deposition parameters (energy density, feed rate, scanning speed) and using pre-alloyed feedstock materials with specific compositions, the system achieves precise equiatomic control without the complexity of conventional multi-step processing.
2Manufacturing precision
If prealloyed multi-principal element powders are manufactured via gas atomization, then the desired composition can be achieved, but the production cost increases and the supply chain becomes less sustainable
Solution Approach 1:
The patent applies preliminary action by pre-alloying the feedstock materials before deposition. Instead of mixing multiple pure metal powders during the alloying process, pre-alloyed feedstock materials (wires, rods, or powders) are prepared in advance with the desired elemental composition, simplifying the manufacturing process and reducing costs while maintaining composition precision.
Solution Approach 2:
The patent merges multiple manufacturing steps into a single directed energy deposition process. By combining feedstock delivery, melting, and deposition in one continuous operation using a directed energy source, the process eliminates the need for separate gas atomization, mixing, and processing steps, thereby reducing cost while maintaining precision.
3Strength
If multi-principal element alloys are formed with complex repeating crystalline lattice structures, then strength and high-temperature stability improve, but the materials become harder to form and machine
Solution Approach 1:
The patent applies local quality by enabling compositional gradients and microstructural variations within the deposited alloy. The directed energy deposition process allows different regions of the alloy to have slightly different compositions or microstructures, which can be optimized to balance strength with formability and machinability for specific application requirements.
4Manufacturing precision
If pure metal powders are used as feedstock materials, then the desired alloy composition can be achieved, but material handling and industrial hygiene safety concerns increase
Solution Approach 1:
The patent uses pre-alloyed feedstock materials (wires, rods, or powders) that are consumed during the deposition process. These feedstock materials are designed to be used up in the manufacturing process, eliminating the need for long-term storage and handling of multiple pure metal powders, thereby reducing safety risks while maintaining composition control.
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 reduces production costs by up to 97% and enhances the control of microstructure and composition, enabling the creation of alloys with improved high-temperature stability, radiation resistance, and durability, suitable for extreme environments like nuclear reactors.
Implementation Method 1
depositing the feedstock alloys into a melt pool formed by a directed energy deposition process
Implementation Method 2
The multi-principal element alloy is formed on a substrate in a directed energy deposition production process
Data Source
AI summary
A method of forming a multi-principal element alloy may include selecting a targeted composition, the targeted composition defining two or more elements and their respective proportions, determining a theoretical relative feed rate of two or more feedstock materials, determining a series of feedstock relative feed rates based on the theoretical relative feed rate, each member of the series defining a relative feed rate of the feedstock materials, forming a functionally graded material article in a directed energy deposition test process by successively matching a test deposition relative feed rate to each member of the series of feedstock relative feed rates, analyzing the functionally graded material article to determine a empirical feedstock relative feed rate of the series of feedstock relative feed rates, and forming the multi-principal element alloy in a directed energy deposition production process by matching a production deposition relative feed rate to the empirical feedstock relative feed rate.