Acta Metallurgica Sinica (English Letters) ›› 2015, Vol. 28 ›› Issue (7): 909-921.DOI: 10.1007/s40195-015-0275-z
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Received:
2015-01-28
Revised:
2015-03-15
Online:
2015-05-03
Published:
2015-07-23
T. Ram Prabhu. An Overview of High-Performance Aircraft Structural Al Alloy-AA7085[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 909-921.
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Fig. 1 Flow stress curves of the homogenized AA7085 Al alloy at 350 °C a, 400 °C b, 450 °C c and the solution-treated AA7085 Al alloy at 350 °C d, 400 °C e, 450 °C f under strain rates of 0.0001-1 s-1 [24]
Temper conditions | Ageing cycle | I SSRT | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Max. exfoliation corrosion depth (μm) | Unit initiation energy (N/mm) |
---|---|---|---|---|---|---|---|
T6 | 120 °C, 24 h | 0.6 | 530 | 582 | 13 | 78 | 148 |
T74 | 110 °C/6 h + 160 °C/10 h | 0.8 | 457 | 525 | 10 | 52 | 182 |
RRA | 120 °C/24 h + 180 °C/0.5 h + 120 °C/24 h | 0.95 | 528 | 578 | 11 | 60 | 169 |
DRRA | 120 °C/24 h + 180 °C/0.5 h + 120 °C/12 h + 180 °C/0.5 h + 120 °C/24 h | 0.95 | 528 | 578 | 12 | 53 | 184 |
HLA | 200 °C/5 min + 120 C/24 h | - | 430 | 510 | 13 | 130 | - |
Table 1 Typical heat treatment cycles, tensile, toughness, and corrosion properties of the AA7085 alloy subjected to different temper and ageing conditions [7, 26, 32, 39]
Temper conditions | Ageing cycle | I SSRT | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Max. exfoliation corrosion depth (μm) | Unit initiation energy (N/mm) |
---|---|---|---|---|---|---|---|
T6 | 120 °C, 24 h | 0.6 | 530 | 582 | 13 | 78 | 148 |
T74 | 110 °C/6 h + 160 °C/10 h | 0.8 | 457 | 525 | 10 | 52 | 182 |
RRA | 120 °C/24 h + 180 °C/0.5 h + 120 °C/24 h | 0.95 | 528 | 578 | 11 | 60 | 169 |
DRRA | 120 °C/24 h + 180 °C/0.5 h + 120 °C/12 h + 180 °C/0.5 h + 120 °C/24 h | 0.95 | 528 | 578 | 12 | 53 | 184 |
HLA | 200 °C/5 min + 120 C/24 h | - | 430 | 510 | 13 | 130 | - |
Property | Typical value |
---|---|
Density (g/cm3) | 2.85 |
Electrical conductivity (%IACS) | 24-41.5 |
Melting point (°C) | 552-635 |
Specific heat at 100 °C (J/(g °C)) | 0.884 |
Thermal conductivity at 100 °C (W/(mK)) | 159.5 |
Coefficient of thermal expansion between 20 and 100 °C (10-6/°C) | 24.7 |
Table 2 Physical properties of the AA7085-T7452 die forging [7]
Property | Typical value |
---|---|
Density (g/cm3) | 2.85 |
Electrical conductivity (%IACS) | 24-41.5 |
Melting point (°C) | 552-635 |
Specific heat at 100 °C (J/(g °C)) | 0.884 |
Thermal conductivity at 100 °C (W/(mK)) | 159.5 |
Coefficient of thermal expansion between 20 and 100 °C (10-6/°C) | 24.7 |
Fig. 4 Effect of air and corrosive medium (3% NaCl + 0.5% H2O2) on tensile properties of the AA7085 Al alloy under different temper conditions (T6, T74, and DRRA) [39]
Property | Typical value |
---|---|
Yield strength (MPa) | 448-462 |
Ultimate tensile strength (MPa) | 496-503 |
Elastic modulus (GPa) | 69.6 |
Elongation (%) | 7-10 |
Shear strength (MPa) | 282 |
Shear modulus (GPa) | 26.9 |
Possion ratio | 0.33 |
Fracture toughness (MPa m1/2) | 137-214 |
Fatigue strength of a smooth specimen for R = +0.1 condition for the life of 107 cyc (MPa) | 289-344 |
Fatigue strength of an open hole (K t = 2.3) specimen for R = +0.1 condition for the life of 107 cyc (MPa) | 165-193 |
Table 3 Mechanical properties of the AA7085-T7452 die forging for the section thicknesses of 25.1-300 mm, and the properties are measured in the samples of longitudinal orientation [17]
Property | Typical value |
---|---|
Yield strength (MPa) | 448-462 |
Ultimate tensile strength (MPa) | 496-503 |
Elastic modulus (GPa) | 69.6 |
Elongation (%) | 7-10 |
Shear strength (MPa) | 282 |
Shear modulus (GPa) | 26.9 |
Possion ratio | 0.33 |
Fracture toughness (MPa m1/2) | 137-214 |
Fatigue strength of a smooth specimen for R = +0.1 condition for the life of 107 cyc (MPa) | 289-344 |
Fatigue strength of an open hole (K t = 2.3) specimen for R = +0.1 condition for the life of 107 cyc (MPa) | 165-193 |
Section thickness (mm) | Direction | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) |
---|---|---|---|---|
25.4-50.8 | L | 448 | 496 | 10 |
LT | 427 | 482 | 8 | |
ST | 407 | 482 | 5 | |
102-152 | L | 448 | 496 | 9 |
LT | 427 | 482 | 7 | |
ST | 407 | 482 | 4 | |
254-305 | L | 448 | 496 | 7 |
LT | 427 | 482 | 4 | |
ST | 407 | 482 | 3 |
Table 4 Effects of section thickness and sample orientation on tensile properties of the AA7085-T7452 die forging [17]
Section thickness (mm) | Direction | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) |
---|---|---|---|---|
25.4-50.8 | L | 448 | 496 | 10 |
LT | 427 | 482 | 8 | |
ST | 407 | 482 | 5 | |
102-152 | L | 448 | 496 | 9 |
LT | 427 | 482 | 7 | |
ST | 407 | 482 | 4 | |
254-305 | L | 448 | 496 | 7 |
LT | 427 | 482 | 4 | |
ST | 407 | 482 | 3 |
Fig. 6 Fracture surface morphologies of AA7085 Al alloy under conditions of T6 a, T74 b, RRA c, HLA d temper conditions [32]; high-magnification images of fracture surface of AA7085 Al alloy show the cracking along the grain boundary triple points, dimples, and voids e, cracking around coarse intermetallic particles f [42]
Fig. 10 Surface morphology of an AA7085 Al alloy affected by exfoliation corrosion under different temper conditions: a T6, b T74, c RRA, d DRRA, e HLA [26]
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