A hierarchical nanolamella-structured alloy with excellent combinations of tensile properties

Dual phase (α+β)-Ti alloys with a fully fine laminated microstructure usually exhibit a high strength but a limited ductility. In the present study, a hierarchical nanolaminated microstructure consisting of lamellae with nano- and submicrometer-sized widths has been produced in a TiZrAlV alloy by em...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-06, Vol.606, p.396-400
Main Authors: Li, Ming, Guo, Defeng, Ma, Tengyun, Shi, Yindong, Zhang, Guosheng, Zhang, Xiangyi
Format: Article
Language:English
Subjects:
Applied sciences
Cold deformation
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Cross-disciplinary physics: materials science
rheology
Ductility
Elasticity and anelasticity
Elasticity. Plasticity
Elongation
Exact sciences and technology
Hierarchical structure
High strength
Lamellar structure
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Nanostructure
Physics
Severe plastic deformation
Strain hardening
Tensile properties
Treatment of materials and its effects on microstructure and properties
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Summary:Dual phase (α+β)-Ti alloys with a fully fine laminated microstructure usually exhibit a high strength but a limited ductility. In the present study, a hierarchical nanolaminated microstructure consisting of lamellae with nano- and submicrometer-sized widths has been produced in a TiZrAlV alloy by employing severe plastic deformation (SPD) combined with subsequent thermal annealing. The hierarchical nanolamella-structured Ti alloy exhibits excellent combinations of tensile properties, e.g., an ultimate tensile strength σUTS=1600MPa and an elongation to failure εf=6.5%. The high strength can be attributed to the formation of a lot of nanoscale α lamellae in the alloy, and the enhanced ductility results mainly from both the coarse α lamellae that have a high strain hardening capability and the complex strain paths caused by a hierarchical nanolaminated structure.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.03.115