A research team led by City University of Hong Kong (CityU) has developed a novel strategy to develop new high-strength alloys which are extremely strong and yet also ductile and flexible.

The strategy overcomes the critical issues of the strength-ductility trade-off dilemma, paving the way for developing innovative structural materials in future.

Multiple-principal element alloys, generally referred as high-entropy alloys (HEAs), is a new type of materials constructed with equal or nearly equal quantities of five or more metals.

They are currently the focus of attention in materials science and engineering due to their potentially desirable properties for structural applications.

Yet most of the alloys share the same key detrimental feature: the higher the strength of an alloy, the less the ductility and toughness, meaning that strong alloys tend to be less deformable or stretchable without fracture.

Recently, however, a research led by Professor Liu Chain Tsuan, University Distinguished Professor of the Department of Materials Science and Engineering at CityU, has found a breakthrough solution to this daunting decades-long dilemma-- by making high-entropy alloys both strong and yet also very ductile through massive precipitation of nanoscale particles.

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