Strengthening Mechanisms in the Surface Layer of Duralumin Modified by a High Current Pulsed Relativistic Electron Beam

Authors V.V. Bryukhovetsky1 , V.V. Lytvynenko1 , D.E. Myla1 , Yu.F. Lonin2 , A.G. Ponomarev2 , V.T. Uvarov2

1Institute of Electrophysics and Radiation Technologies NAS of Ukraine, p.o. box. 8812, 28, Chernyshevsky St., 61002 Kharkiv, Ukraine

2NSC «Kharkiv Institute of Physics and Technology» NAS of Ukraine, 1, Akademichna St., 61108 Kharkiv, Ukraine

Issue Volume 13, Year 2021, Number 6
Dates Received 24 November 2021; revised manuscript received 09 December 2021; published online 20 December 2021
Citation V.V. Bryukhovetsky, V.V. Lytvynenko, D.E. Myla, et al., J. Nano- Electron. Phys. 13 No 6, 06025 (2021)
PACS Number(s) 07.05.Tp, 61.80.Fe, 87.63.Hg
Keywords High current electron beam, Aluminum alloy, Microhardness (2) , Strengthening mechanisms.

The mechanisms of strengthening of the surface layer of D16AT aluminum alloy irradiated with a high-current relativistic electron beam were studied. The alloy was irradiated with an electron beam with a particle energy of 0.35 MeV, a beam current of 2.0 kA, and a pulse duration of 5 μs. This article shows that the processing of D16AT aluminum alloy by a high-current relativistic electron beam leads to melting of irradiated surface and the formation of a surface layer with a modified structural-phase state. The thickness of this layer is approximately 100 (m. A solid solution based on aluminum is the main constituent of this layer. At the same time, intermetallic phases that were present in the initial state of the alloy cannot be detected by means of X-ray diffractometry. It was established that processing of the surface of D16AT alloy with a pulsed electron beam leads to grain refining. In the initial state of the alloy, the average grain size is 11 (m. In the modified layer, the average grain size is approximately 0.8 (m. The microhardness of the irradiated layer increases by almost 50 %. The contribution of different strengthening mechanisms to the change of strength characteristics of the modified surface layer was analyzed. It was shown that the dispersion mechanism makes the main contribution to the strengthening of the alloy in the initial state. While the dislocation mechanism of strengthening plays a key role in increasing the microhardness of the irradiated layer. The importance of these observations for thermomechanical processing of aluminum alloys in order to further improve their strength characteristics was discussed.

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