Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 734, Issue -, Pages 34-41Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.07.082
Keywords
Amorphous materials; Metal matrix nanocomposites; Mechanical alloying; Nanoparticles; Hot extrusion; High strength
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Funding
- National Natural Science Foundation of China [51701075]
- Science and Technology Program of Guangzhou [201804010365]
- Fundamental Research Funds for the Central Universities [2017ms009]
- Team Project of Natural Science Foundation of Guangdong Province [2015A030312003]
- Major Special Project for Science and Technology of Guangdong Province [2015B090926004]
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A novel Al-based composite reinforced with Ti-based metallic glass (MG) nanoparticles was fabricated by powder metallurgy through mechanical alloying combined with hot extrusion. During the ball-milling process, MG microparticles were refined into nanosized particles through severe plastic deformation. Hot extrusion of the milled powders resulted in a dense and uniform dispersion of the metallic glass nanoparticles in the Al-7075 matrix. This unique homogeneous structure led to a significant enhancement of strength without adversely affecting the plasticity, thus developing super-high specific yield strength. The yield strength increased from 297 MPa for Al-7075 matrix to 530, 610, 880, and 1014 MPa for the composites milled for 10, 15, 30, and 50 h, respectively. A critical analysis of the different factors contributing to the strength of the composites was carried out. Grain refinement, Orowan strengthening, and dislocation-dislocation interactions were demonstrated to be the most important contributors to the enhanced strength of the nanocomposite.
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