Dissimilar Metal Joining via Quasi-Liquid Interface Bonding

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Solution Overview

Problem

Existing methods for joining dissimilar metals, such as Al/Fe, Ti/Fe, and Mg/Fe, often result in brittle intermetallic compounds at the joint interface, making the welds unsuitable for safety-critical engineering structures.

Innovation Solution

The method involves applying rapid friction between dissimilar metal components to generate a layer of quasi-liquid metal and shear localization at the interface, followed by terminating the friction and applying compression pressure to deform the quasi-liquid metal, thereby minimizing intermetallic compounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional fusion-based or solid-state welding methods are used to join dissimilar metals, then the metals can be bonded together, but brittle intermetallic compounds form at the joint interface reducing weld reliability

Engineering Contradiction:

Improvejoint strengthVSAvoidweld reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The invention changes the physical state parameter of the metal at the joint interface by generating quasi-liquid metal through rapid friction, transforming the interface from a solid-state metallurgical bond to a liquid-like bonding state that prevents intermetallic compound formation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces conventional thermal-based fusion welding or solid-state diffusion welding with a mechanical friction-based approach that generates quasi-liquid metal, substituting thermal-metallurgical mechanisms with mechanical-energy-driven phase transformation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If processing peak temperatures are reduced or cooling rates are increased to minimize intermetallic compounds, then intermetallic size is reduced incrementally, but the problem of intermetallic formation remains unsolved

Engineering Contradiction:

Improveweld reliabilityVSAvoidmanufacturing process effectiveness

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention utilizes phase transition by generating quasi-liquid metal through rapid friction, creating a liquid-like state at the joint interface that fundamentally changes the bonding mechanism and prevents intermetallic compound formation, rather than merely reducing their size through temperature or cooling rate adjustments

Inventive Principle:

Principle #36Phase transitions

3Strength

If rapid friction is applied to generate quasi-liquid metal, then intermetallic compounds are minimized and joint strength is improved, but the process requires precise timing control

Engineering Contradiction:

Improvejoint strengthVSAvoidprocess control complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The rapid friction process is self-regulating, where the generation of quasi-liquid metal and subsequent shear localization automatically terminate the harmful intermetallic formation process, reducing the need for complex external control systems

Inventive Principle:

Principle #25Self-service

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 creation of stronger dissimilar metal structures with minimal detrimental intermetallic compounds, achieving a cost-effective manufacturing process suitable for safety-critical applications.

Implementation Method 1

applying rapid friction between the first component and the second component sufficient to generate a layer of quasi-liquid metal

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

applying rapid friction between the first component and the second component sufficient to generate a layer of quasi-liquid metal

Methodology Applied

Scientific EffectViscous heating: Viscous Heating

Implementation Method 3

applying compression pressure to deform the quasi-liquid metal

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12318861B2Methods of joining dissimilar metals without detrimental intermetallic compounds

Publication Date: 2025.06.03 THE RGT UNIV OF MICHIGAN

AI summary

A method of joining a first component and a second component that are made of dissimilar metals. In some embodiments, the method comprises applying friction between the first component and the second component sufficient to generate a layer of quasi-liquid metal and produce shear localization within the quasi-liquid metal at a dissimilar metal interface between the first component and the second component and terminating the application of friction at a predetermined time after generation of the quasi-liquid metal. In some embodiments, the method comprises applying amorphous metal between at least a portion of the first component and the second component at a dissimilar metal interface, heating the amorphous metal to a temperature between its glass transition temperature (Tg) and the lowest melting temperature of the components involved, and applying compression pressure to generate thermoplastic deformation of the amorphous metal.