Advanced structural materials with ultrahigh strength and excellent ductility are highly desirable for a wide variety of technological applications, including aerospace, transportation, and energy industries. However, ultrahigh-strength materials typically suffer from low tensile ductility, which severely limits their practical utility.
Recently, a research team led by Dr JIAO Zengbao, assistant professor of PolyU Department of Mechanical Engineering, developed an innovative design concept for high-performance materials by engineering nanolamellar architectures, which leads to the development of new bulk nanostructured materials with an unprecedented combination of over 2 GPa yield strength and 16% uniform tensile ductility at ambient temperature. The extraordinary mechanical properties of the newly developed alloys offer tremendous potential for structural applications in aerospace, automotive, and energy industries. In addition, the fundamental concept of lamellar architecture engineering can be applied to many other metallic materials, including new-generation superalloys, titanium alloys, and advanced steels, to achieve enhanced properties for specific applications.
This work has been recently published in Nature Communications [“Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures”, https://www.nature.com/articles/s41467-020-20109-z]. Mr FAN Lei, PolyU ME PhD student is the first author, and Dr JIAO Zengbao is one of the corresponding authors.