A cobalt-aluminum nanolaminate from Purdue reached 6 GPa yield strength—about six to 10 times high-strength structural steel—while still sustaining 15% plastic strain at room temperature.
The team achieved that mix by embedding dislocations during sputtering deposition and adding amorphous interfaces that partially crystallize under stress, generating more dislocations instead of letting the brittle intermetallic crack.
In situ compression tests and molecular dynamics simulations showed those interfaces actively helping the material deform, pointing to a new way to make normally brittle intermetallic compounds usable in demanding conditions.
Jet engines, gas turbines, energy systems and defense hardware could benefit if the concept scales beyond today’s thin-film nanoscale layers into bulk CoAl composites and other intermetallic materials.
A material ten times stronger than steel exists. How long until it moves from the lab to our jets and reactors?
This new super-metal gains strength from flaws. Is imperfection the secret to designing all future materials?
Breaking the Strength-Ductility Barrier: CoAl Nanolaminate Achieves 6 GPa Yield Strength and 15% Plastic Strain
Overview
In 2026, Purdue University engineers made a major breakthrough in materials science by creating a cobalt aluminum (CoAl) nanolaminate that overcomes the usual tradeoff between strength and ductility. This new material is made using magnetron sputtering deposition, which forms a nanoscale layered structure with a high density of dislocations and a unique framework of amorphous interfaces. As a result, the CoAl nanolaminate achieves an impressive yield strength of 6 GPa and can withstand 15% plastic strain at room temperature—an unprecedented combination for intermetallic materials. This innovation opens new possibilities for advanced, durable materials in demanding industries.