6082 Alloy

Alloy name: 6082
Diagram No.: 813
Type of diagram: TTP
Chemical composition in weight %: 0.981.10% Mg, 1.001.12% Si, 0.520.61% Mn, 0.10% Cu, 0.50% Fe, 0.20% Zn, 0.25% Cr, balance is Al
Alloy group: Aluminium-based alloys
Note: TTP curves for 6082 aluminum alloy. Based on the variation observed for hardness of artificially aged 6082 aluminum alloy at different isothermal temperatures, the TTP curves for hardness at 90, 95, 99.5% of the maximum were constructed as illustrated in Fig. The TTP curves of alloy 6082 are C-shaped, with the nose of the curve at approximately 335 C. The critical temperature range is 240440 C (based on 99.5% of maximum hardness curve with a transformation time of 10 s). The equilibrium phase precipitation of alloy 6082 during aging is Mg2Si. This is a diffusion-controlled phase transformation. When the supersaturated solid solution is quenched at the 10 s transformation temperature interval, it is easy to precipitate and form the second phase due to a high degree of supersaturation.
The phase transformation process changes within the different temperature ranges, thereby affecting the rate of subsequent artificial aging. At the high isothermal temperature range (>= 440 C), for the low degree of supercooling and driving force, nucleation rate is low, despite the high solute atom release. Hence, the rate of equilibrium phase precipitation is low, which results in slower changes in hardness value. When the isothermal temperature is low (<=240 C), though the degree of supercooling and driving force are high, the rate of solute atom release remains low because of the low temperature. Therefore, the alloy hardness also decreased slowly with time. At the moderate temperature interval (240440 C), the degree of supercooling and driving force for precipitation are high. In combination with the solute atom release rate, a maximum rate of precipitation and a relatively short incubation period are realized.
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