Aging Processes in Ultrafine‐Grained Low‐Alloyed Bronzes Subjected to Equal Channel Angular Pressing. Issue 12 (12th June 2015)

• Record Type: Journal Article
• Authors: Dobatkin, Sergey V.; Bochvar, Natalia R.; Shangina, Daria V.
• Is Part Of: Advanced engineering materials. Volume 17:Issue 12(2015:Dec.)
• Page Start: 1862
• Page End: 1868
• Publication Date: 2015-06-12
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500099
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract: The aging processes in Cu‐0.7% Cr, Cu‐0.9% Hf, and Cu‐0.7% Cr‐0.9% Hf alloys after equal channel angular pressing have been studied. ECAP leads to strong grain refinement (200 nm for Cu‐0.7% Cr‐0.9% Hf alloy). It was shown that the Cu5 Hf particles are more efficient as strengthening phase than the particles of Cr‐based solid solution. Alloying with hafnium also improves the thermal stability of hardening and minimizes recrystallization processes at aging temperatures. Temperature‐time aging regimes of bronzes for achieving optimal combination of strength, ductility, and electrical conductivity were also determined. Ternary alloy after aging at 500 °C for 2.5 h has a tensile strength of 582 MPa, an elongation of 18%, and an electrical conductivity of 75% IACS. Abstract : The aging processes in ultrafine‐grained (UFG) bronzes alloyed with Cr and Hf after equal channel angular pressing (ECAP) has been studied. It is shown that the ECAP leads to a considerable strengthening due to the UFG structure formation. The subsequent aging results in additional hardening and an increase in electrical conductivity at the expense of decomposition of supersaturated solid solution.