Mechanical properties of an aluminum Alloy at high temperature 1

[torpen]

Hello,

A specimen in aluminum alloy (6000 series) is maintained at a temperature of the order 400 °C for a few seconds.

What are the values of the yield strength and of the Young's modulus at this temperature level.
I have basic data for static stress values until 350 °C (temperature applied during 30 min instead of a few seconds) but I do not if I can use these data?

Thanks in advance to everybody.

Regards,


Torpen

 

[kenvlach]

What is the alloy & temper?
To give an answer, I will use Al 6061-T6 data.

Data to 700 ^oF (371 C) is given in MIL-HDBK-5J. Figure 3.6.2.2.1(a). Extrapolating the 1/2 hr exposure curve to 760 ^oF (404 ^oC) gives an ultimate tensile strength of 6% of room T value.

Figure 3.6.2.2.1(b). Effect of temperature on the tensile yield strength (Fty) of 6061-T6 aluminum alloy (all products) is given to 800 ^oF. At 752 ^oF (400 ^oC), F_ty is slightly < 6% of room temperature value for 1/2 hr exposure. Shorter exposure will be higher, so say 6% x room T value.

Figure 3.6.2.2.4. Effect of temperature on the tensile and compressive moduli (E and Ec) of 6061 aluminum alloy. To 600 Figure 3.6.2.2.4. Plotted only to 600^oF.
Extrapolating to 752 ^oF (400 ^oC) gives E = 52% x room T value.

Figure 3.6.2.2.5(b). Effect of exposure at elevated temperatures on the room temperature elongation of 6061-T6 aluminum alloy (all products). Plotted only to 700^oF. Data suggest that briefly heating to 752 ^oF (400 ^oC) will increase subsequent room T ductility to 29%.

Will use T6 temper values at room T values from Table 3.6.2.0(d). Design Mechanical and Physical Properties of 6061 Aluminum Alloy Rolled, Drawn, or Cold-Finished Bar, Rod, and Shapes:
Ftu, 42 ksi
Fty, 35 ksi
E, 9.9 x 10³ ksi
elongation, 10%

Gives the following values at 400 ^oC:

Ftu, 2.52 ksi (17.4 MPa)
Fty, 2.10 ksi (14.5 MPa)
E, 5.148 x 10³ ksi (35.5 GPa)
elongation, 29%

 

[torpen]

Thanks for your help.
Regards.
Torpen