Ultrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures

Nano-lamellar materials with ultrahigh strengths and unusual physical properties are of technological importance for structural applications. However, these materials generally suffer from low tensile ductility, which severely limits their practical utility. Here we show that markedly enhanced tensile ductility can be achieved in coherent nano-lamellar alloys, which exhibit an unprecedented combination of over 2 GPa yield strength and 16% uniform tensile ductility. The ultrahigh strength originates mainly from the lamellar boundary strengthening, whereas the large ductility correlates to a progressive work-hardening mechanism regulated by the unique nano-lamellar architecture. The coherent lamellar boundaries…

• CU
  City University of Hong Kong

  Awards: 25202719, 11213319, 11202718
• NN
  National Natural Science Foundation of China

  Award: 51801169
• RG
  Research Grants Council, University Grants Committee

  Award: 25202719
• HK
  Hong Kong Polytechnic University

  Awards: P0013994, P0009738, 25202719