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Related Experiment Video

Updated: Feb 6, 2026

Determining Tribocorrosion Rate and Wear-Corrosion Synergy of Bulk and Thin Film Aluminum Alloys
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Effect of Alloying Elements Gradient on Solid-State Diffusion Bonding between Aerospace Aluminum Alloys.

Fan Wu1,2,3, Wenlong Zhou4, Yujie Han5

  • 1School of Material Science and Engineering, Dalian University of Technology, Dalian 116085, China. wufandut@126.com.

Materials (Basel, Switzerland)
|August 17, 2018
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Summary

Optimizing aerospace aluminum alloy bonding, researchers found higher temperatures enhance joint strength. The 1420-7B04 alloy pair achieved superior integrity and a peak shear strength of 188 MPa at 520 °C.

Keywords:
alloying element diffusiondiffusion bondinginterface microstructureshear strength

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Area of Science:

  • Materials Science
  • Metallurgy
  • Aerospace Engineering

Background:

  • Aerospace aluminum alloys require robust joining methods for structural integrity.
  • Optimizing solid-state bonding parameters is crucial for high-performance applications.

Purpose of the Study:

  • To investigate the effect of bonding temperature on the interface microstructure and mechanical properties of dissimilar aluminum alloy joints.
  • To compare the bond quality of 1420-1420, 7B04-7B04, and 1420-7B04 couples.
  • To analyze the diffusion behavior of alloying elements at the interface.

Main Methods:

  • Solid-state vacuum bonding of aluminum alloy couples (1420-1420, 7B04-7B04, 1420-7B04) at temperatures ranging from 460-520 °C under 6 MPa for 60 min.
  • Microstructural analysis using Scanning Electron Microscopy (SEM).
  • Elemental distribution analysis using Energy Dispersive Spectroscopy (EDS).
  • Mechanical property evaluation via tensile-shear strength testing.

Main Results:

  • Bond quality and strength increased with bonding temperature for all couples.
  • The 1420-7B04 dissimilar alloy couple exhibited superior interface integrity and higher bond strength compared to similar alloy couples.
  • The highest shear strength achieved was 188 MPa for the 1420-7B04 couple bonded at 520 °C.
  • Increased bonding temperature significantly enhanced the diffusion coefficient of Magnesium (Mg).
  • A diffusion affected zone (DAZ) formed, promoting bonding by accelerating interfacial void shrinkage.

Conclusions:

  • Solid-state bonding temperature is a critical parameter for enhancing the quality and strength of aerospace aluminum alloy joints.
  • The 1420-7B04 dissimilar alloy combination offers superior bonding performance over similar alloy pairings.
  • Element diffusion and the formation of a DAZ play key roles in achieving void-free, high-strength joints.