Researchers Bonded Aluminum and Copper via Roll Welding
A solid-state cold rolling method created durable joints between copper and aluminum sheets without forming brittle intermetallic compounds.
Updated on Sept. 28, 2026 in Materials Science
Researchers successfully bonded aluminum 1050 and pure copper sheets using a new solid-state roll bond welding method. The process, currently in the research stage, achieved a tensile strength of 148 MPa.
Why it matters
Eliminating intermetallic compounds at the interface of copper and aluminum is a significant hurdle in materials science, as these brittle layers typically weaken joints in electrical and automotive applications. This mechanical interlocking approach offers a way to join dissimilar metals while maintaining structural integrity.
The study recorded a final tensile strength of 148 MPa, with grain sizes refined to 5 μm for aluminum and 2 μm for copper following a 60% thickness reduction.
The details
The researchers employed a solid-state process where aluminum and copper sheets, each initially 2 mm thick, were joined via cold rolling. By cutting the interface at a 30° angle, which reduced to 12° during the 60% thickness reduction, the team facilitated bonding through mechanical interlocking rather than diffusion. This method effectively prevented the formation of intermetallic compounds—brittle chemical structures that form when different metals are fused at high temperatures and often lead to joint failure.
The Tech Race
The researchers utilized Abaqus to simulate the stress distribution during rolling, extending established modeling practices in metallurgical engineering. This work marks a departure from traditional thermal welding techniques that rely on melting and diffusion to connect dissimilar metals.
This research provides a foundational method for engineers looking to improve electrical conductivity and weight in hybrid metal components. Because this study focused on lab-scale bonding, it does not currently change existing consumer product manufacturing workflows.
The takeaway
This study proves that mechanical interlocking can replace high-heat diffusion for bonding dissimilar metals. Future research will likely focus on testing the fatigue life of these bonds compared to existing industrial standards.
Further reading
For more developments in structural metals and joining methods, visit the Materials Science section.
More information
Read the full findings in the published peer-reviewed research article.
Source note: This article includes information reported by Nature.
