Effect of Sigma2 grain boundaries on plastic deformation of WC-Co cemented carbides
Artikel i vetenskaplig tidskrift, 2006

Cutting inserts of WC–6 wt.% Co were investigated before and after plastic deformation. The deformation tests were performed with a turning operation under realistic, yet controlled, conditions. SEM studies showed that after deformation the WC skeleton structure had broken up and thin lamellae of binder phase had formed in less than 10% of the grain boundaries. Ab initio calculations showed that ∑2 twist WC/WC boundaries have a high work of separation and the interface energy is not lowered by forming two Co/WC boundaries. Electron backscattered diffraction (EBSD) measurements showed an apparent increase in the relative occurrence of ∑2 boundaries due to poor indexing of the deformed material. The accumulation of dislocations in general boundaries is held responsible for the difficulty in identifying them compared with ∑2 boundaries. At the ∑2 tilt boundary the grains have the glide planes {1 0 -1 0} in common and at the ∑2 twist boundary there are three glide planes intersecting, which facilitate dislocation movements across the ∑2 boundaries.

Plastic deformation

Cemented carbides

Ab initio calculations

EBSD

Författare

Gustaf Östberg

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Muhammad Umar Farooq

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Mikael Christensen

Chalmers, Teknisk fysik, Material- och ytteori

Hans-Olof Andrén

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Uta Klement

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Göran Wahnström

Chalmers, Teknisk fysik, Material- och ytteori

Mat. Sci. and Eng. A.

Vol. 416 119-

Ämneskategorier

Den kondenserade materiens fysik