An aluminium alloy is sought for a demanding application. For safety reasons the designer has specified a minimum fracture toughness of \(30 \mathrm{MPa} \cdot \mathrm{m}^{1 / 2}\) and the highest possible strength. Use the property trajectory of Fig. 6.19 to select an alloy and a heat treatment that meets the requirements. Use the internet to find out more about the alloy and the heat treatment that you select.

Data From Fig. 6.19

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60- 60 50 50 Alloying and heat treatment: Al-alloys Wrought non age-hardening Al-alloys Al 2024, TO Al 1050, HO 40- Pure Al Al 5083, TO AI 5083, H321 Al 2024, T6 Al 7075, TO Al 1050, H19 AI 2024, T4 Wrought age-hardening Al-alloys. Al 6061, T6 Al 5083, H343 30- Cast Al-alloys Fracture toughness Kc (MPa.m1/2) 20 -20 20 Al 514.0, F Al 356.0, F Al 380.0, F 50 Al 360.0, F Al 520.0, T4 Al 7075, T7352 Al 7075, T6 Al 296.0, T6 Al 355.0, T6 Al 201.0, T7. Al 354.0, T6 Al 332.0, T5 Al 336.0, T65 100 200 Yield strength y (MPa) 500 MFA 15 1000