Ultrasound effect on structure and properties of Cu–0.5Cr under upsetting

ABSTRACT

We studied the effect of the regimes of ultrasonic action on the structural transformation during free upsetting with 50% reduction of the copper alloy Cu–0.5Cr. In the process of deformation, the samples were subjected to intermittent and continuous ultrasonic actions. It can be noted that the application of ultrasonic vibrations in the process of deformation leads in both cases to a reduction in yield strength. Under a continuous ultrasonic action with a power of 640 W, the most developed structure is formed, with a fraction of high-angle boundaries equal to 32.4%, with the lowest values of coherent scattering regions, density of dislocations and microdistortions, while the decline in yield strength of the material under deformation is 40 MPa.

This paper is part of a Thematic Issue on Copper and its Alloys.

KEYWORDS:

• Deformation
• structure transformation
• ultrasonic vibrations
• copper alloy
• EBSD

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The research was conducted in the framework of the joint Slovak-Russian research project “Investigation of Combined Techniques of Severe Deformation by Shear, Promising for Industrial Application” supported by the Ministry of Education, Science, Research and Sport of the Slovak Republic [Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky] under Contract No. 0393-2016 and by the Ministry of Education and Science of the Russian Federation under Grant Agreement No. 14.586.21.0025 (unique identification number RFMEFI58616X0025); and was additionally supported by the Slovak Research and Development Agency [Agentúra na podporu výskumu a vývoja] under project No. APVV-14-0284.