Structural evolutions of metallic materials processed by severe plastic deformation

Bulk nanostructured (ns)/ultrafine-grained (UFG) metallic materials possess very high strength, making them attractive for high strength, lightweight and energy efficient applications. The most effective approach to produce bulk ns/UFG metallic materials is severe plastic deformation (SPD). In the l...

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Published in:Materials science & engineering. R, Reports : a review journal Vol. 133; pp. 1 - 59
Main Authors: Cao, Yang, Ni, Song, Liao, Xiaozhou, Song, Min, Zhu, Yuntian
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 01.11.2018
Elsevier BV
Subjects:
BCC metals
Deformation mechanisms
Deformation twinning
Dislocation density
Dislocations
Grain growth
Grain refinement
High strength
Material properties
Mechanical properties
Nanostructured metallic materials
Phase transformation
Phase transitions
Plastic deformation
Severe plastic deformation
Structural design
Twinning
Ultrafines
Phase transformation
Severe plastic deformation
Grain growth
Nanostructured metallic materials
Mechanical properties
Deformation twinning
Grain refinement
Dislocations
ISSN:0927-796X, 1879-212X
Online Access:Get full text
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Summary:Bulk nanostructured (ns)/ultrafine-grained (UFG) metallic materials possess very high strength, making them attractive for high strength, lightweight and energy efficient applications. The most effective approach to produce bulk ns/UFG metallic materials is severe plastic deformation (SPD). In the last 30 years, significant research efforts have been made to explore SPD processing of materials, SPD-induced microstructural evolutions, and the resulting mechanical properties. There have been a few comprehensive reviews focusing mainly on SPD processing and the mechanical properties of the resulting materials. Yet no such a review on SPD-induced microstructural evolutions is available. This paper aims to provide a comprehensive review on important microstructural evolutions and major microstructural features induced by SPD processing in single-phase metallic materials with face-centered cubic structures, body-centered cubic structures, and hexagonal close-packed structures, as well as in multi-phase alloys. The corresponding deformation mechanisms and structural evolutions during SPD processing are discussed, including dislocation slip, deformation twinning, phase transformation, grain refinement, grain growth, and the evolution of dislocation density. A brief review on the mechanical properties of SPD-processed materials is also provided to correlate the structure with mechanical properties of SPD-processed materials, which is important for guiding structural design for optimum mechanical properties of materials.
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ISSN:0927-796X
1879-212X
DOI:10.1016/j.mser.2018.06.001