TY - GEN

T1 - About formability of ultra-fine grained metallic materials

AU - Sabirov, Ilchat

AU - Moreno-Valle, Eva

AU - Murashkin, Maxim Yu

AU - Valiev, Ruslan Z.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Ultra-fine grained (UFG) and nanostructured metallic materials obtained via severe plastic deformation typically show very high mechanical strength but low tensile ductility, which dramatically limits their practical utility. Significant efforts were made to improve uniaxial tensile ductility of ultra-fine grained and nanostructured metallic materials. The developed strategies can be divided into two main groups. (1) The ‘mechanical’ strategies employ the mechanical characteristics of these materials, such as their work hardening ability and/or strain rate sensitivity. These mechanical characteristics can be varied via changing testing parameters, such as temperature and/or strain rate. (2) The ‘microstructural’ strategies are based on idea of intelligent microstructural design to suppress necking at early stages of plastic deformation thus improving ductility. However, not much attention was paid to the fact, that in metallforming operations, metallic materials are not deformed uniaxially, but have to undergo deformation under complex strain paths. This work aims to demonstrate that despite UFG metallic materials have low tensile ductility, they can show enhanced formability during plastic deformation in complex stress state (such as formability under biaxial stretch, which is sufficient for metalforming operations.

AB - Ultra-fine grained (UFG) and nanostructured metallic materials obtained via severe plastic deformation typically show very high mechanical strength but low tensile ductility, which dramatically limits their practical utility. Significant efforts were made to improve uniaxial tensile ductility of ultra-fine grained and nanostructured metallic materials. The developed strategies can be divided into two main groups. (1) The ‘mechanical’ strategies employ the mechanical characteristics of these materials, such as their work hardening ability and/or strain rate sensitivity. These mechanical characteristics can be varied via changing testing parameters, such as temperature and/or strain rate. (2) The ‘microstructural’ strategies are based on idea of intelligent microstructural design to suppress necking at early stages of plastic deformation thus improving ductility. However, not much attention was paid to the fact, that in metallforming operations, metallic materials are not deformed uniaxially, but have to undergo deformation under complex strain paths. This work aims to demonstrate that despite UFG metallic materials have low tensile ductility, they can show enhanced formability during plastic deformation in complex stress state (such as formability under biaxial stretch, which is sufficient for metalforming operations.

KW - Ductility

KW - Formability

KW - Mechanical strength

KW - Severe plastic deformation

KW - Ultra-fine grained materials

UR - http://www.scopus.com/inward/record.url?scp=84958087829&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.838-839.476

DO - 10.4028/www.scientific.net/MSF.838-839.476

M3 - Conference contribution

AN - SCOPUS:84958087829

SN - 9783038356721

T3 - Materials Science Forum

SP - 476

EP - 481

BT - Superplasticity in Advanced Materials, ICSAM 2015

A2 - Itoh, Goroh

A2 - Kobayashi, Junya

A2 - Kitazono, Koichi

A2 - Sato, Eiichi

A2 - Takayama, Yoshimasa

A2 - Itoi, Takaomi

A2 - Morita, Koji

PB - Trans Tech Publications Ltd

T2 - 12th International Conference on Superplasticity in Advanced Materials, ICSAM 2015

Y2 - 6 September 2015 through 10 September 2015

ER -