Table 7: Designation of elevated temperature treatments [2, 11, 12].

TemperTreatmentUse

T1The elevated temperature fabrication process followed by stable temper aging.The products are not worked at ambient temperature following elevated temperature fabrication. The product properties cannot recognize the ambient temperature straightening and flattening effects.
T2The elevated temperature fabrication process followed by ambient temperature working and stable temper aging.The strength of the products is enhanced by ambient temperature working and the product properties can recognize the flattening or straightening effects.
T3Solution heat treated, cold worked, and aged to a substantially stable condition.The strength of the products is enhanced by ambient temperature working after solution treatment and the product properties can recognize the flattening or straightening effects.
T4Solution heat treated and aged to a substantially stable condition.The products are not worked at ambient temperature following solution heat treatment. The product properties cannot recognize the ambient temperature straightening and flattening effects.
T5Cooled from an elevated temperature shaping process and artificially aged.The products are not worked at ambient temperature following elevated temperature fabrication. The product properties cannot recognize the ambient temperature straightening and flattening effects.
T6Solution heat treated and then artificially aged.The products are not cold worked after solution heat-treatment or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limit.
T7Solution heat treated and overaged/stabilized.The artificial aging of the wrought product after the solution heat-treatment to beyond the point of highest strength.
T8Solution heat treated, ambient temperature worked, and then artificially aged.The strength of the products is enhanced by ambient temperature working after solution treatment and the product properties can recognize the flattening or straightening effects.
T9Solution heat treated, artificially aged, and then work hardened.The work hardening to enhance strength after artificial aging.
T10Cooled from an elevated temperature shaping process, cold worked and then artificially aged.The products which are cold worked to improve strength or in which the effect of cold work in flattening or straightening is recognized in property limits.
Tx51Stress relieving before ageing.
Tx52Stress relieving by compressing.
Tx54Stress relieving by combined stretching and compressing.
T72Corrosion resistance is enhanced by overaging.
T73Corrosion resistance is enhanced by step aging.
T76Step aging leading to enhancement of exfoliation corrosion behavior
T73x51 T76x51Combined stress relieving/step ageing