Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Age Hardening


The Influence of Quenching Media and Aging Time on Microstructure and Mechanical Behavior of 6061 Aluminum Alloy

Naser Korde Zedin

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1757-1770

Aluminum-magnesium-silicon (Al-Mg-Si) alloys are medium strength, excellent formability, good corrosion resistance and widely used in extruded products and automotive body materials. The influence of quenching media with different aging time on microstructure and mechanical properties of 6061 aluminum alloy was investigated. The results show formation of (Mg2Si) and (CuAl2) phaseswhensolution treatmentwas applied (at 520°C for 2h,followed by quenching in water and oil at room temperature then aging (at 175°C for 2, 4and6h)) which resultimprovingof both the strength, hardness and decreases elongation. It can be noted that, the grains of samples which are quenching in water is finer than the structure of samples which are quenching in oil. The values of yield stress and ultimate tensile strength decrease respectively with increasing aging time to 6h as (258MPa) and (264MPa) for water quenching and (199MPa) and (235MPa) for oil quenching. In this piper were measured and discussedthe variation of the yield stress, ultimate tensile strength and elongation with different solution quenching and aging time.

The Effect of Rolling and Heat Treatment on Mechanical Behavior of 6061 Aluminum Alloy

Ruaaabd al Kaream Salman

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1389-1398

In this study, the influence of bothheat treatment and cold working (rolling) on the tensile properties andhardness of6061 aluminum alloy sheets was investigated. The solution heat treatment is first performed at about 520°C 1 hr followed by rolling to(40% and 60%). Artificial aging is obtained by heating to about 180 °C for 1/2hr and 2 hr.Theexperimental work has revealed that when two strengthening mechanism(cold work and aging)are combined, the values of the mechanical properties are come up.Increasing the aging time from ½ hrto 2hr with redaction in area was causing increase in the values of the strength and hardness and dropping the elongation. In the other hand, increasing the redaction in area from (40%) to (60%) with aging was rising the value of the strength and hardness and dropping the elongation. The changes in mechanical properties were discussed as a result of increasing the dislocation density(result of rolling) and formation of precipitation(effect of aging) which are interface with the motion of dislocation and causes hindering of dislocation.