1. Crystal–Glass High‐Entropy Nanocomposites with Near Theoretical Compressive Strength and Large Deformability
- Author
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Dierk Raabe, Ye Wei, Wenzhen Xia, Wenjun Lu, Ziyuan Rao, Shaofei Liu, Jian Lu, Shanoob Balachandran, Ge Wu, Zhiming Li, Chang Liu, Michael Herbig, Gerhard Dehm, and Baptiste Gault
- Subjects
Materials science ,Nanocomposite ,Amorphous metal ,Mechanical Engineering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Amorphous solid ,Shear modulus ,Compressive strength ,Mechanics of Materials ,Stacking-fault energy ,General Materials Science ,Composite material ,Dislocation ,0210 nano-technology ,Ductility - Abstract
High-entropy alloys (HEAs) and metallic glasses (MGs) are two material classes based on the massive mixing of multiple-principal elements. HEAs are single or multiphase crystalline solid solutions with high ductility. MGs with amorphous structure have superior strength but usually poor ductility. Here, the stacking fault energy in the high-entropy nanotwinned crystalline phase and the glass-forming-ability in the MG phase of the same material are controlled, realizing a novel nanocomposite with near theoretical yield strength (G/24, where G is the shear modulus of a material) and homogeneous plastic strain above 45% in compression. The mutually compatible flow behavior of the MG phase and the dislocation flux in the crystals enable homogeneous plastic co-deformation of the two regions. This crystal-glass high-entropy nanocomposite design concept provides a new approach to developing advanced materials with an outstanding combination of strength and ductility.
- Published
- 2020
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