• Effect of thermo-mechanical alloying and ageing in AA2014 aluminium alloys after synthesized using graphite

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    • Keywords

       

      AA2014 alloy; mechanical alloying; ageing; Al$_2$Cu precipitates; Al$_4$C$_3$ particles.

    • Abstract

       

      There is always a necessity to tailor new age materials for use in aircraft and automobile industries, and also in sophisticated fields at which resistance to elevated temperatures is of prime importance. To ensure the stability of high strength levels of conventionally precipitation-hardened aluminium (Al) alloys, thermo-mechanical alloying and ageing treatment (TMAAT) was applied to AA2014 Al alloys. Essentially, AA2014 alloy was thoroughly decorated with fine Aldispersoids and precipitates bymeans of ball-milling and conventional ageing. Hence, using powder metallurgy methodology, powders of AA2014 alloy and graphite were mechanically alloyed (MA) for 7 h in a vertical attritor. The obtained powder mixture was then cold pressed into samples under the pressure of 800 MPa. To decorate the matrix with finely distributed Al$_4$C$_3$ phase particles (dispersoids), samples were systematically annealed (sintered) for a long time in a furnace system operating under a controlled atmosphere of argon at 550$^{\circ}$C. This temperature was found to form a ternary Al–Cu–Mgliquid phase in carbon-blended AA2014 alloy during sintering. However, the Al$_4$C$_3$ phase could not be observed. After subsequent homogenization and water quenching, all samples were age hardened at 150$^{\circ}$C for 46 h. Results confirmed that ordinary AA2014 alloy with Al$_2$Cu precipitates over-aged normally as expected. In contrast, the material treated by MA had reinforcing Al$_4$C$_3$ particles together with Al$_2$Cu precipitates. It was realized that this reinforced material did not soften and still retained its high peak hardness level even during prolonged over-ageing treatment. Consequently, it was apparent that TMAAT improved the strength, and therefore was promising for resistance to high-temperature exposure of the material.

    • Author Affiliations

       

      ABBAS TAMER ÖZDEMIR1 SINAN AKSÖZ2

      1. Department of Metallurgy and Materials Engineering, Faculty of Technology, Gazi University, Ankara 06500, Turkey
      2. Department of Metallurgy and Materials Engineering, Faculty of Technology, Pamukkale University, Denizli 20160, Turkey
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  • Bulletin of Materials Science | News

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