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Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys

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Strength gradient in impact-induced metallic bonding.

Qi Tang¹, David Veysset^2,3, Hamid Assadi⁴

¹Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, 14853, USA.

Nature Communications

|November 7, 2024

Summary

Metallic microparticles bonding to substrates at supersonic speeds creates interfaces with varying bond strengths. The oxide form at the interface significantly influences bond strength, enabling a predictive framework for impact-induced bonding.

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Published on: June 7, 2018

Area of Science:

Materials Science
Surface Science
Mechanical Engineering

Background:

Solid-state bonding of metallic microparticles to substrates occurs at supersonic impact velocities.
Understanding the properties of these impact-induced bonded interfaces is crucial but remains challenging.

Purpose of the Study:

To investigate the interfacial strength across bonded interfaces formed by microparticle impacts.
To determine the factors influencing the emergent bond strength at these interfaces.

Main Methods:

In situ microparticle impact experiments were conducted.
Site-specific micromechanical measurements were employed to assess interfacial strength.
Analysis focused on the correlation between oxide form and bond strength.

Main Results:

A gradient of bond strength was observed across the bonded interface.
Bond strength initially increased significantly beyond bulk material yield strength before reaching a plateau.
The form of native oxide (layers, particles, or debris) was identified as a key determinant of bond strength.

Conclusions:

The interfacial bond strength in supersonic impacts is not uniform but exhibits a distinct gradient.
Native oxide characteristics critically control the achievable bond strength.
A predictive framework based on contact pressure and surface exposure can forecast impact-induced bond strength.