A study of optimization of heat-treatment conditions in retrogressions and reageing treatment of 7075-T6 aluminium alloy

✍ Scribed by K. Ural

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 726 KB
• Volume: 13
• Category: Article
• ISSN: 0261-8028
• DOI: 10.1007/bf00420806

✦ Synopsis

7075 aluminium alloy in T6 temper, which has high strength, is known to be highly susceptible to stress-corrosion cracking. For high mechanical properties and stress-corrosion cracking resistance a heat treatment knoWn as retrogression and reageing (RRA) was developed by Cina and Ranish [1]. This treatment is applied to the material in T6 condition and involves a short heat treatment in the range 200-280 °C followed by reageing using conditions similar to those used for original T6 ageing. A schematic representation of the changes in hardness and yield strength during R R A is shown in Fig. 1. Cina and Ranish claimed that processing to the minimum of the retrogression curve followed by reageing led to the favourable combination of T6 strength and T73 stress-corrosion cracking resist-