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Small scale testing approach to reveal specific features of slip behavior in BCC metals

Authors :
Roy Johnsen
Stephane Dumoulin
Yun Deng
Bjørn Rune Sørås Rogne
Afrooz Barnoush
Nousha Kheradmand
Source :
Acta Materialia. 174:142-152
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

Plastic behavior of Fe–3%Si was investigated with a novel methodology at microscopic scale and higher stress resolution beyond the existing macroscopic test methods. Activation of single slip system in micropillars under compression provides perfect shear and excludes the lattice rotation. Crystallographic orientation dependency of critical resolved shear stress (CRSS) was observed. Different scenarios regarding activated slip planes are discussed to explain this orientation dependency. Schmid's law approach, which only considers the stress component parallel to the Burgers vector, fails to explain this orientation dependency of CRSS. It is shown that the non-glide stress components should be taken into account in order to precisely define the plasticity in BCC metals.

Details

ISSN :
13596454
Volume :
174
Database :
OpenAIRE
Journal :
Acta Materialia
Accession number :
edsair.doi...........f57eada9ba7d350e43bb640d9ec27af0