Study of Improved Aluminum Materials for Vehicular Armor
Abstract
An Intermediate Thermal Mechanical Treatment (ITMT), consisting of warm rolling at 500 F followed by a recrystallization treatment, produced a fine-grained, relatively equiaxed, recrystallized structure in 7475 plate. Alloy 7475-T6 plate having this recrystallized structure (AR) had slightly lower strengths and fracture toughness and higher ductility (tensile reduction in area) than laboratory or commercial hot rolled 7475-T6 plate having an unrecrystallized structure. Alloy 7475-T6, similarly processed to a fine- grained, recrystallized structure, then hot rolled 25% at 750 F (AR and HR) had (1) strengths similar to laboratory and commercial hot rolled 7475-T6 plate, (2) fracture toughness similar to commercial hot rolled 7475-T6 plate but slightly lower than laboratory hot rolled 7475-T6 plate, and (3) ductility higher than laboratory or commercial hot rolled 7475-T6 plate. The fracture toughness of both the recrystallized (AR) and the recrystallized plus hot rolled (AR and HR) 7475-T6 plate was significantly higher than the fracture toughness of conventionally processed commercial 7075-T651 plate. Application of Final Thermal Mechanical Treatment (FTMT) practices to 7475 plate produced strength/ toughness relationships generally superior to that of 7075-T651 plate. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 07, 1977
- Accession Number
- ADA039488
Entities
People
- J. E. Vruggink
Organizations
- Alcoa