A 6061 합금의 기계적 특성에 미치는 2단시효의 영향

Effects of Two-Step Aging Treatment on the Mechanical Properties of 6061 Al Alloy

Abstract

The impact of two-step treatment on the mechanical properties of the 6061 Al alloy was investigated by testing the hardness and electrical conductance values. After two-step aging treatment, the hardness and electrical conductivity of the alloy was increased, and if the first aging treatment temperature was lower than the secondary aging treatment temperature, both the hardness and the electrical conductivity were not increased. The higher the temperature of the first aging treatment, the higher the hardness. The temperature of the first aging treatment is $175^{\circ}C$, $150^{\circ}C$, $120^{\circ}C$, and the second is $175^{\circ}C$ and $120^{\circ}C$.

Fig. 1. Heattreatment curve of standard specimen & alloy A.

Fig. 2. Heattreatment curve of alloy B & C.

Fig. 3. Hardness of standard specimen after heattreat-ment .

Fig. 4. Hardness change of alloy A after heattreatment.

Fig. 5. Hardness change of standard specimen, alloy B & C after 2nd heattreatment.

Fig. 6. Hardness of standard specimen, alloy B & C after 2nd heattreatment.

Fig. 7. Electrical conductivity of standard specimen, alloy A, B & C after 2nd heattreatment.

Table 1. Compositions of A 6061

Table 2. Heattreatment condition

Table 3. Hardness of standard specimen & alloy A after heattreatment

Table 4. Hardness of standard specimen, alloy B & C after heattreatment (HV)

Table 5. Electrical conductivity of standard specimen, alloy A, B & C after 2nd heattreatment (dS/m)