Theory of designing the gradient microstructured metals for overcoming strength-ductility trade-off

Gradient microstructure design has been found to be an effective approach to significantly produce the utmost advanced structural metallic materials, which have a signature in mechanical characteristic of strength-ductility-hardenability combination. In this work, a physical theory and mechanism-bas...

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Bibliographic Details
Published in:Scripta materialia 2020-07, Vol.184, p.41-45
Main Authors: Fan, Jitang, Zhu, Linli, Lu, Jian, Fu, Tao, Chen, Aiying
Format: Article
Language:English
Subjects:
Ductility
Metal
Microstructure
Strength
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Summary:Gradient microstructure design has been found to be an effective approach to significantly produce the utmost advanced structural metallic materials, which have a signature in mechanical characteristic of strength-ductility-hardenability combination. In this work, a physical theory and mechanism-based numerical model are developed for sophisticatedly designing the gradient microstructured metals. It considers the gradient distribution of grain size, twin, martensite and austenite in a metallic alloy. The numerical results are validated through experiments. The mechanical performance of high strength, large ductility and considerable hardenability is achieved and their trade-off is successfully overcome. Theory of designing the metals with a gradient microstructure involving grain size and volume fraction of austenite and martensite as well as twin space for overcoming strength-ductility trade-off with the mechanical performance of high strength, large ductility and considerable hardenability, which is validated by experiments. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.03.045