Ti-Ni Shape Memory Alloy 4D Printing for Complex Part Forming
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Solution Overview
Problem
Traditional methods for preparing titanium-nickel shape memory alloy face challenges such as sensitivity to chemical composition, poor machinability, high production costs, and difficulty in forming complex parts, limiting its applications and performance.
Innovation Solution
A 4D printing method involving the milling of titanium and nickel to create alloy powder, followed by surface modification using discharge plasma assisted ball milling, and subsequent Selective Laser Melting (SLM) forming, which enhances the microstructure and performance of the alloy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional smelting and casting processes are used to prepare titanium-nickel shape memory alloy, then the alloy can be produced, but impurity elements (such as C, N and O) are introduced which affect the shape memory performance
Solution Approach 1:
The patent replaces traditional mechanical smelting and casting processes with a powder metallurgy approach followed by SLM (Selective Laser Melting) additive manufacturing. This substitution eliminates the high-temperature molten state that causes impurity incorporation, while the controlled powder processing and selective laser melting maintain excellent shape memory performance.
Solution Approach 2:
The patent employs inert atmosphere protection throughout the powder preparation and SLM processing to prevent oxidation and contamination. The powder is processed in a controlled environment, and the SLM chamber is maintained under protective atmosphere, effectively preventing introduction of harmful impurity elements like oxygen and nitrogen.
2Productivity
If traditional machining methods are used on titanium-nickel shape memory alloy, then the alloy can be processed, but the machinability is poor which reduces production efficiency
Solution Approach 1:
The patent replaces traditional mechanical machining with SLM additive manufacturing. The complex parts are built layer-by-layer through selective laser melting of powder, eliminating the need for difficult machining operations. This directly addresses the poor machinability issue while significantly improving production efficiency for complex geometries.
Solution Approach 2:
The patent transitions from subtractive manufacturing (machining) to additive manufacturing (SLM), fundamentally changing the manufacturing dimension from removing material to building material. This dimensional shift enables complex internal structures and geometries that would be impossible or extremely difficult to machine, thereby resolving the machinability problem.
3Adaptability or versatility
If traditional production processes are used for titanium-nickel shape memory alloy, then the alloy can be manufactured, but the cost is high which makes the final product expensive
Solution Approach 1:
The patent segments the manufacturing process into powder preparation and SLM additive manufacturing stages. This segmentation allows for optimized processing of each stage, reduces material waste, and enables complex parts to be manufactured without expensive tooling or multiple assembly steps, thereby reducing overall production cost and expanding applicability.
Solution Approach 2:
The patent changes the fundamental manufacturing parameters from traditional high-cost processes to powder metallurgy combined with SLM. This parameter change includes using atomic ratio control during powder mixing, controlled atmosphere processing, and selective laser melting parameters that optimize both cost and performance, making the alloy more economically viable for widespread application.
4Shape
If traditional processes are used, then simple alloy forms can be produced, but complex parts such as porous structures and actuators cannot be formed or require high forming costs
Solution Approach 1:
The patent employs SLM additive manufacturing which builds parts in three dimensions layer-by-layer, enabling complex internal geometries, porous structures, and actuators that are impossible to achieve with traditional forming methods. This dimensional manufacturing approach directly creates complex shapes without requiring expensive specialized tooling or assembly processes.
Solution Approach 2:
The SLM process allows for local variation in material properties and geometry within the same part. Different regions can have different porosity, density, or structural characteristics by adjusting laser parameters locally, enabling complex parts with spatially varying properties to be manufactured in a single process, thereby resolving the forming capability limitation.
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 method achieves high-density, high-strength titanium-nickel alloy with improved shape memory performance, enabling the rapid manufacturing of complex parts with reduced costs and expanded application fields.
Implementation Method 1
SLM technology can directly melt metal powder completely under the heat effect of laser beam
Implementation Method 2
the heat effect of laser beam
Implementation Method 3
the molten powder of the SLM technology has a high cooling rate during solidification
Implementation Method 4
experiences a wide range of non-equilibrium solidification in the cooling process
Implementation Method 5
surface modification using discharge plasma assisted ball milling
Data Source
AI summary
Disclosed are a 4D printing method and application of titanium-nickel shape memory alloy. The 4D printing method comprises the following steps: mixing and smelting pure titanium and pure nickel to obtain titanium-nickel alloy bars, then preparing alloy powder by a rotating electrode atomization method, and sieving the powder to obtain titanium-nickel alloy powder with a particle size of 15-53 μm; placing the obtained titanium-nickel alloy powder in a discharge plasma assisted ball mill for discharge treatment to perform surface modification of the powder; and subjecting the titanium-nickel alloy powder to SLM forming to obtain the titanium-nickel shape memory alloy.