IMPACT OF COLD PLASTIC DEFORMATION AND THERMAL POST-TREATMENT ON THE PHYSICAL PROPERTIES OF COPPER BASED ALLOYS Al-BRONZE AND α-BRASS

Abstract

The copper based alloys Al-bronze and α-brass containing each of 10wt% aluminum and zinc were prepared by casting. Afterwards, the specimens were cold-rolled with various percentages of deformation and the cold-rolled samples were aged subsequently at the varied time for four hours and temperatures ranging up to 500°C. Samples underwent characterizations by microhardness testing, electrical resistivity, optical properties, differential scanning calorimetry as well as microstructure analysis using an optical microscope. The results showed that the hardening of Cu-based alloys was taken place due to solid-solution hardening. Al addition accelerated the hardness through ageing due to the formation of various intermetallic copper aluminites into the aged alloy which was hard and brittle in nature. The resistivity decreased marginally through heat treatment due to the stage of stress relieving, recovery, precipitation coarsening as well as recrystallization and increased for arranging different intermetallics into the alloys. The microstructural study revealed that the cold rolled alloys content the different phases of elongated grain at the rolling direction. Meanwhile higher ageing temperatures at 500°C for one hour led to recrystallization and grain growth especially in pure copper and Cu-10Zn alloys.

The Effect of Heat Input, Annealing, and Deformation Treatment on Structure and Mechanical Properties of Electron Beam Additive Manufactured (EBAM) Silicon Bronze

“…As-cast bronze microstructures are usually represented by large columnar grains that are detrimental for mechanical characteristics, and therefore various thermomechanical post-treatments such as forging and rolling should be used to improve them. However, it is very difficult to apply these treatments for processing either large-sized or shaped additively manufactured components [3][4][5][6][7].…”

Effect of Long Used Machine Oil on the Tribological Behaviour of Cu-Based Gear Materials

“…Pure copper is a soft and malleable metal with high electrical and thermal conductivity. It is mostly used for electrical power transmission and in electrical equipment such as cables and motors [1,2]. A wide range of applications is enhanced when copper is alloyed with other elements.…”

Influence of Rolling Speed on the Temperature Field During Cold Rolling of Aluminium Sheets

“…The mechanical energy generated during plastic and elastic deformation of the metal is partially converted into heat; the remaining part is stored as deformation energy. The stored deformation energy remains in the material after unloading in the form of internal defects, phase changes and other permanent microstructural changes [6][7][8][9][10], while the generated heat causes an increase in the material temperature [11]. In the rolling process, in addition to the heat generated during plastic deformation, there is also a heat flux resulting from the friction process that occurs in the contact area between the tool and the deformed material [12][13][14][15].…”