Home Kovove Materialy-Metallic Materials 2014 Metallic Materials Vol. 52 (2014), no. 6, pp.337-344

Journal info

Select Journal







Webshop Cart

Your Cart is currently empty.

Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.

Metallic Materials Vol. 52 (2014), no. 6, pp.337-344

Title: Relation between microstructural features and mechanical properties in oxygen free high conductivity copper after Equal-Channel Angular Pressing
Author: T. KVACKAJ, A. KOVÁČOVÁ, R. KOČIŠKO, J. DUTKIEWICZ, L. LITYŃSKA-DOBRZYŃSKA, J. KANSY

Abstract: An oxygen free high conductivity (OFHC) copper was subjected to maximum 13 ECAP passes to achieve a sufficiently high degree of deformation. Strength properties (yield stress and ultimate tensile strength) show obvious increase up to the 4th pass. In the 6th ECAP pass, the yield stress and ultimate tensile strength are stabilized at a maximum of 449 MPa. Microstructure studies showed that the 1st ECAP pass caused a significant increase of dislocation density. These dislocations are arranged in cells, forming dense dislocation walls at low-angle subgrains. After the 5th ECAP pass, well-defined equiaxed ultrafine grains of diameter approximately 500 nm had emerged forming high-angle grain boundaries. The defect density studies carried out by positron annihilation spectroscopy method revealed an increase in a defect density (vacancies, dislocations) up to the 4th pass, consequently with number of ECAP passes increasing, decrease in defects density (seen by positrons) was observed.

Keywords: dislocation, grain boundaries, equiaxed ultrafine grained microstructure, electron microscopy, Equal Channel Angular Pressing (ECAP)
Published online: 08-Dec-2014
Year: 2014, Volume: 52, Issue: 6 Page From: 337, Page To: 344
doi:10.4149/km_2014_6_337
Price: Call for Pricing






© AEPress s.r.o
Copyright notice: For any permission to reproduce, archive or otherwise use the documents in the ELiS, please contact AEP.