Aluminum alloys at high temperatures

Tensile strength

The strength of aluminum alloys decreases with increasing temperature, not to mention, of course, the effect of artificial aging. The duration of exposure to elevated temperature is important for both work-hardened aluminum alloys, and thermally hardened alloys, but it has no effect on properties of aluminum alloys in the annealed condition. On the image 1 shows the test results of the static tensile specimens of aluminum alloy is thermally hardened 2014-Т6 (АК8) at different temperatures after exposures of different durations at the same temperatures. Test duration at elevated temperatures often reach 10000 hours, Often, however, the test results and interpolate 10000 hours.


Figure 1

Strength aluminum alloys shear, compression and collapse, as well as fatigue strength It varies with temperature as well as the tensile strength. usually take, that the relationship of the "strength" to the tensile strength consistently. recover strength, which declined due to excessive heat, can only heat treatment or autofrettage, which is usually not practical for finished products.

Change tensile strength aluminum alloy AlCu4MgSi (2014, АК8) when tested at room temperature after various exposure durations at various elevated temperatures is shown in Figure 2. After a brief exposure to high temperatures or prolonged exposure to moderate material temperature reaches super soft annealed state and is almost constant low tensile strength.

predel- prochnosi-duralumina-posle vydererzki- pri-visokix-temperaturax

Tensile strength of the alloy dyuralyuminovogo AK8
at elevated temperatures

Figure 2

Elastic modulus

The elastic modulus of aluminum alloys also decreases with increasing operating temperature. However, in contrast to the strength characteristics, which are stabilized at low "annealed" values, он возвращается к своему значению при комнатной температуре после окончания воздействия повышенной температуры (рисунок 3).


Figure 3

Source: TALAT 1501