Amorphous Metal Cladding via Ultrasonic Bonding Without Heat Damage
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Solution Overview
Problem
Existing methods for manufacturing cladded surfaces with amorphous metals are labor-intensive, time-consuming, and struggle to achieve desired specifications due to low fracture toughness and difficulty in joining with other materials, particularly in extreme temperature conditions, where epoxy-based bonds fail to provide adequate strength.
Innovation Solution
Ultrasonic additive manufacturing (UAM) is used to metallurgically bond amorphous metallic foils to substrates through plastic deformation, creating a small bond zone with minimal crystallinity and no heat-affected zone, resulting in a composite with high corrosion resistance and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If epoxy-based bonding is used to join amorphous metal structures, then assembly is simplified, but bond strength and reliability under extreme temperature conditions deteriorates
Solution Approach 1:
A nickel interlayer is introduced between the amorphous metal components and the epoxy adhesive. This intermediary layer serves multiple functions: it provides a metallurgical bond to the amorphous metal surface, creates a stable transition zone that accommodates thermal expansion differences, and enhances the overall bond strength. The nickel layer acts as a mediator that bridges the gap between the amorphous metal substrate and the epoxy adhesive, preventing direct thermal stress concentration at the epoxy-metal interface.
Solution Approach 2:
The joint structure is designed as a composite system comprising amorphous metal components, nickel interlayer, and epoxy adhesive in a layered configuration. This composite approach combines the advantages of each material: the amorphous metal provides structural integrity and low melting point characteristics, the nickel interlayer provides metallurgical bonding and thermal stability, and the epoxy provides gap-filling and additional bonding capability. The composite structure distributes thermal stresses across different materials with complementary properties.
2Temperature
If amorphous metal structures are used for low melting point applications, then material burn-up during re-entry is achieved, but structural strength and fracture toughness deteriorates
Solution Approach 1:
The structure is designed as a composite system where amorphous metal components (providing low melting point for controlled burn-up) are joined to crystalline metal components (providing high strength and fracture toughness). The nickel interlayer facilitates metallurgical bonding between these dissimilar materials. This composite approach allows the structure to exhibit low melting point behavior in the amorphous regions for atmospheric protection while maintaining overall structural integrity through the crystalline reinforcement elements.
Solution Approach 2:
Different regions of the structure are assigned different material properties: amorphous metal regions are positioned where low melting point and controlled burn-up are desired (providing local thermal protection), while crystalline metal regions with high strength and fracture toughness are positioned where structural integrity is critical. The nickel interlayer is locally applied at interfaces to enable bonding between these functionally differentiated zones.
3Manufacturing precision
If traditional cladding methods (roll bonding, co-extrusion, weld overlay) are used, then cladded surfaces are produced, but labor intensity and time consumption increase
Solution Approach 1:
Traditional mechanical cladding processes (roll bonding, co-extrusion, weld overlay) are replaced with ultrasonic additive manufacturing. This technology uses ultrasonic vibration energy to metallurgically bond amorphous metal foils to substrates in a controlled, layer-by-layer additive process. The ultrasonic bonding mechanism eliminates the need for high-pressure rolling, complex extrusion equipment, or thermal welding operations, significantly reducing equipment complexity and processing time while maintaining bond quality.
Solution Approach 2:
The bonding process transitions from high-temperature thermal methods or high-pressure mechanical methods to ultrasonic vibration-based bonding at near-room temperature. This parameter change in the bonding mechanism allows for precise control of the cladding process, reduces energy consumption, and eliminates the need for extensive post-processing. The ultrasonic parameters (frequency, amplitude, pressure) can be precisely controlled to achieve consistent bond quality across different production volumes.
4Strength
If amorphous metal foils are joined to substrates, then metallurgical bonding with high strength is achieved, but processing complexity increases
Solution Approach 1:
Complex thermal welding processes or high-pressure bonding equipment are replaced with ultrasonic additive manufacturing technology. The ultrasonic bonding head integrates the bonding mechanism into a relatively simple tool that applies ultrasonic vibration and controlled pressure to join amorphous metal foils to substrates. This substitution reduces the complexity of processing equipment while achieving metallurgical bond strength comparable to or exceeding traditional methods.
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 UAM process enables the production of ductile and fracture-resistant BMG structures with enhanced mechanical properties, overcoming limitations of epoxy-based bonds and achieving superior performance in extreme temperature conditions.
Implementation Method 1
Ultrasonic additive manufacturing (UAM) is used to metallurgically bond amorphous metallic foils to substrates through plastic deformation
Implementation Method 2
metallurgically bond amorphous metallic foils to substrates through plastic deformation
Data Source
AI summary
An embodiment relates to an ultrasonic additive manufacturing process, comprising joining a foil comprising a bulk metallic glass to a substrate; and forming a cladded composite comprising the foil and the substrate; wherein a thickness of the cladded composite is greater than a critical casting thickness of the bulk metallic glass, wherein the cladded composite comprises a cladding layer of the bulk metallic glass on the substrate and the bulk metallic glass comprises approximately 0% crystallinity, approximately 0% porosity, less than 50 MPa thermal stress, approximately 0% distortion, approximately 0 inch heat affected zone, approximately 0% dilution, and a strength of about 2,000-3,500 MPa.