Fracture Analysis and Local Mechanical Properties of Copper Processed by Ecar

Abstract

The work deals with fracture analysis of oxygen free high conductivity (OFHC) copper after tensile testing done at the room temperature. The samples for testing were severely plastically deformed by equal channel angular rolling (ECAR) process, 1 to 33 ECAR passes were performed. This method provides specific structural changes which have a highly advantageous influence on mechanical properties (yield stress, ultimate tensile strength, and reduction of area) as well as nanohardness and indentation modulus of elasticity. All experimental materials were investigated by progressive loading/unloading technique of instrumented indentation at loads from 1 up to 10 mN and indentation hardness (H) and indentation modulus of elasticity (E) were measured. Fracture of studied materials was transcrytalline ductile with dimple morphology accompanied by significant sample deformation. Most probably it was initiated by dislocation mechanism. The results suggest that about 13 ECAR passes result in best performance of the material.

Pengaruh Anneal Hardening Dan % Reduksi Warm Rolling Terhadap Sifat Mekanik Paduan Cu-Zn 70/30 [Influence of Anneal Hardening And Warm Rolling % Reduction To Mechanical Properties of Cu-Zn 70/30]

“…Deformation band dalam Gambar 9(a) -9(b) dan Gambar 11(a)-11(b) merupakan struktur yang terbentuk karena regangan yang besar [15][16][17][18][19][20] . Garis-garis yang muncul tersebut nantinya akan berkembang menjadi shear band apabila deformasi warm rolling dilakukan pada % reduksi yang lebih tinggi lagi.…”