Effect of Quenching Rate and Pre-strain on the Strain Ageing Behaviors of 7075 Aluminum Alloys


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KAÇAR R. , Guleryuz K.

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, cilt.18, ss.328-333, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 18 Konu: 2
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1590/1516-1439.307414
  • Dergi Adı: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
  • Sayfa Sayıları: ss.328-333

Özet

The mechanical properties of aluminum alloys are strongly dependent on the thermo-mechanical process so, the strain ageing behavior of 7075 Al-alloy was investigated in this study. A set of test pieces was solution heat treated at 480 degrees C for 2 h, water quenched (SHTWQ) then pre-strained for 8% in tension. The test samples were aged at 140 degrees C for 0.5, 1, 2, 3, 4, 6, 8, 10, 12, 24, 48, 72 and 96 h in a furnace. The other set of test samples were solution heat treated at 480 degrees C for 2 h, quenched in sand (SHTSQ) then pre-strained for 8% in tension. They were also aged at 140 degrees C for same intervals. The effect of strain ageing, on the mechanical properties of Al-alloy, was investigated by mean of hardness, and tensile tests. The results shown that, the quenching rate after solution heat treatment, ageing time and temperature, as well as pre-strain, play a very important role in the precipitationhardening associated with ageing process of the 7075 Al-alloy.