TECHNICAL MECHANICS
ISSN (Print): 1561-9184, ISSN (Online): 2616-6380

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UDC 620.1

Technical mechanics, 2019, 4, 119 - 126

IMPROVING THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF Al-Mg ALLOYS FOR VEHICLE COLLISION PROTECTION

DOI: https://doi.org/10.15407/itm2019.04.119

Poshyvalov V. P., Kuzmytska O. I., Telehina I. I.

Poshyvalov V. P.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine

Kuzmytska O. I.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine

Telehina I. I.
Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine

      The physical and mechanical properties of Al-Mg alloys employed in shock-absorbing structural components of vehicles were studied. Specimens of AMg6 alloy were studied experimentally according to Standard GOST 1497-84 to determine its ultimate mechanical characteristics attainable by heating and accelerated cooling. To determine the physical and mechanical characteristics of large-size components of shock-proof structures made of this alloy and to develop industrial heat treatment processes, 300 mm × 250 mm × 30 mm specimens were used. The specimens were heated in air-filled SNV electric furnaces and cooled in hardening tanks. The specimens were loaded into a cold furnace. The furnace laboratory temperature was brought to a specified one, and the specimen temperature was measured with chromel-copel thermocouples. The specimens were hold at a specified temperature of 450 °C for 90 minutes. The cooling medium was 6 °C to 25 °Ñ running water and 100 °Ñ still boiling water.
      The test results showed that this treatment increases the lateral impact strength by (8 – 10) % and reduces the longitudinal impact strength by (2 – 4) % on accelerated cooling in comparison with an annealed alloy. It was shown that accelerated cooling of Al-Mg alloys from 450 ?Ñ to a room temperature increases their impact strength by (10 – 15) % and their unit elongation while reducing their yield point by (18 – 23) % and keeping their ultimate strength intact. On heating to 80 °Ñ and air cooling, the impact strength of specimens treated by the accelerated cooling, while decreasing by 5 %, is 12 % higher than the impact strength of annealed specimens and annealed specimens heated as indicated above.
     

Al-Mg alloy, physical and mechanical properties of a material, heating, cooling, annealing, shockproof structures

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DOI: https://doi.org/10.15407/itm2019.04.119

Copyright (©) 2019 Poshyvalov V. P., Kuzmytska O. I., Telehina I. I.

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