TY - JOUR

T1 - Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy

AU - Edalati, Kaveh

AU - Horita, Zenji

AU - Valiev, Ruslan Z.

PY - 2018/4/30

Y1 - 2018/4/30

N2 - Recent developments of nanostructured materials with grain sizes in the nanometer to submicrometer range have provided ground for numerous functional properties and new applications. However, in terms of mechanical properties, bulk nanostructured materials typically show poor ductility despite their high strength, which limits their use for structural applications. The present article shows that the poor ductility of nanostructured alloys can be changed to room-temperature superplastisity by a transition in the deformation mechanism from dislocation activity to grain-boundary sliding. We report the first observation of room-temperature superplasticity (over 400% tensile elongations) in a nanostructured Al alloy by enhanced grain-boundary sliding. The room-temperature grain-boundary sliding and superplasticity was realized by engineering the Zn segregation along the Al/Al boundaries through severe plastic deformation. This work introduces a new boundary-based strategy to improve the mechanical properties of nanostructured materials for structural applications, where high deformability is a requirement.

AB - Recent developments of nanostructured materials with grain sizes in the nanometer to submicrometer range have provided ground for numerous functional properties and new applications. However, in terms of mechanical properties, bulk nanostructured materials typically show poor ductility despite their high strength, which limits their use for structural applications. The present article shows that the poor ductility of nanostructured alloys can be changed to room-temperature superplastisity by a transition in the deformation mechanism from dislocation activity to grain-boundary sliding. We report the first observation of room-temperature superplasticity (over 400% tensile elongations) in a nanostructured Al alloy by enhanced grain-boundary sliding. The room-temperature grain-boundary sliding and superplasticity was realized by engineering the Zn segregation along the Al/Al boundaries through severe plastic deformation. This work introduces a new boundary-based strategy to improve the mechanical properties of nanostructured materials for structural applications, where high deformability is a requirement.

KW - SEVERE PLASTIC-DEFORMATION

KW - GRAIN-BOUNDARY SEGREGATION

KW - SOLUTE SEGREGATION

KW - ZINC ALLOY

KW - METALS

KW - MICROSTRUCTURE

KW - TRANSFORMATION

KW - MAGNESIUM

UR - http://www.scopus.com/inward/record.url?scp=85046351383&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/transition-poor-ductility-roomtemperature-superplasticity-nanostructured-aluminum-alloy

U2 - 10.1038/s41598-018-25140-1

DO - 10.1038/s41598-018-25140-1

M3 - Article

AN - SCOPUS:85046351383

VL - 8

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 6740

ER -