Cyclic Character of the Microhardness Aluminium Alloy D16 under Ultrasonic Impact Treatment

Authors

  • Andrij Burmak
  • Serhij Sidorenko
  • Mykhajlo Vasylyev
  • Svitlana Voloshko

DOI:

https://doi.org/10.20535/1810-0546.2013.1.90718

Abstract

The article studies possibilities of more effective surface hardening as compared with conventional thermo-mechanical processing. Specifically, we provide the insight into surface hardening of light structural alloys by ultrasonic impact treatment (UIT) in air under quasi-hydrostatic pressure of the sample. By example of the commercial aluminum alloy D16 we demonstrate the unique opportunity to harden the surface (up to ~600 %) using the synergistic effect of low-temperature processes of mechanical nanostructuring as well as mechanical and chemical interaction of aluminum with oxygen under the influence of UIT. We propose the qualitative model for formation of oxide coating several tens of micrometers thick. By employing a set of physical methods we establish basic laws of the phase formation and chemical composition, structure and mechanical properties of the D16 alloy surface layers depending on the amplitude and duration of UIT. We show that the development of dynamic recovery and dynamic recrystallization processes causes the cyclic nature of microhardness changes. Under optimal conditions of UIT the wear resistance of surface layers increased by 2,5 times, and the compression residual stresses level is 650 MPa.

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Published

2013-02-28

Issue

No. 1 (2013): Engineering

Section

Art

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