Aluminum Dreams

Ingulstad, Mats

doi:10.5324/njsts.v2i2.2150

Cited by 1 publication

(1 citation statement)

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“…The recovery and global growth of the Aluminum Industry following WW2 is well documented [61][62][63] and the history of aluminum-magnesium based marine alloys has recently been reviewed [64][65][66].…”

Section: Rosenhain and Archbuttmentioning

confidence: 99%

Environment-Induced Cracking of High-Strength Al-Zn-Mg-Cu Aluminum Alloys: Past, Present, and Future

Holroyd¹,

Burnett

Lewandowski

et al. 2022

Corrosion

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Environment induced cracking (EIC) during commercial use of aluminum alloys started over 125 years ago (mid-1890’s), some 45 years earlier than previously documented, with earliest failures for Al-Zn-Mg-Cu, 7xxx series alloys occurring a decade later. Needs for lighter, thicker and stronger alloy products, firstly driven by WW1 and WW2 militaristic requirements and subsequently by relentless demands from modern aircraft industry designers, resulted in major in-service EIC in commercial high strength Al-Zn-Mg-Cu alloys in the US and UK during the 1950’s, 1960’s and 1970’s. These were avoidable had research findings from France, Germany and Japan from the 1930’s and 1940’s been implemented. Unprecedented US Government R&D funding during the late 1960’s, 1970’s and early 1980’s led to AA7050 and similar alloys, that essentially eliminated EIC issues during commercial usage for several decades. EIC assessment for the following ‘new-generation’ high-strength alloys relied totally on standard ASTM Test Methods, incapable of providing data directly relatable to the service conditions. Although EIC service issues for the latest generation of 7xxx series alloys remains manageable, the premature appearance of EIC requires a quantitative understanding of EIC initiation under environmental and mechanical conditions directly relatable to intended use, to prevent un-expected failures for future alloys. Directions for future high-strength 7xxx series aluminum alloy development and EIC assessment to provide quantitative date relatable to service conditions and input for structural design and for service life prediction are discussed.

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