Received date: 2022-04-24
Revised date: 2022-07-28
Online published: 2022-09-06
Supported by
National Key Research and Development Program of China(2021YFA1200203);National Natural Science Foundation of China(51971112);Fundamental Research Funds for the Central Universities(30919011405)
Metallic structural materials have a wide range of industrial applications (including in the aviation, aerospace, navigation, military industry, nuclear power, chemical industry, construction, and bridge-building fields) due to their unique properties (such as heat resistance and high strength and toughness). At present, there are development opportunities for metallic structural materials, but these materials are also facing challenges due to the gradual substitution of carbon fiber composites and the increasing shortage of metal mineral resources. China's metallic structural material industry is facing development roadblocks and opportunities. Nanostructured metals and alloys have a wide range of potential industrial applications in the field of aviation, aerospace, navigation, military industry with requirements for energy conservation and weight reduction due to their high strength, but their low fracture elongation is a major limitation. The low ductility of nanostructured metals is caused by their low strain hardening rate; the strain hardening rate is caused by the difficulty of dislocation accumulation. This is because the small grain size limits dislocation propagation and reaction. After more than 20 years of research, the low ductility of nanostructured metals has been improved by tailoring the metal microstructures, such as by introducing nano-precipitation, twin boundaries, multi-scale grain distribution, twinning, or phase transformation, nano-gradient structure, and heterogeneous structure, or by lowering dislocation density, etc. These toughening schemes improve the dislocation accumulation capacity and strain hardening rate of nanostructured metals, and ultimately improve their toughness. The tensile properties of nanostructured metals are closely related to their microstructures and deformation temperature, strain rate, tensile sample size, and loading state.
Key words： nanostructured metal; strength; ductility; strain hardening; toughening
Yonghao ZHAO , Qingzhong MAO . Toughening of Nanostructured Metals[J]. Acta Metall Sin, 2022 , 58(11) : 1385 -1398 . DOI: 10.11900/0412.1961.2022.00191
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