Stress-corrosion resistance of high-strength Al-Zn-Mg-Cu alloys with and without silver additions

Hunsicker, H. Y.; Staley, James T.; Brown, R. H.

doi:10.1007/bf02680599

Cited by 12 publications

(4 citation statements)

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“…By 1950 AA7075-T6 alloy was 20% of Alcoa's total shipment of heat-treatable aircraft products [59]. However, peak-aged AA7075-T6 has inadequate EIC resistance in the short-transverse loading direction [50,82,83]. Smooth tensile samples in 0.6M NaCl under alternate immersion conditions showed EIC failures at stresses as low as 70 MPa [82] at only 15% of the yield stress.…”

Section: Rosenhain and Archbuttmentioning

confidence: 99%

“…However, peak-aged AA7075-T6 has inadequate EIC resistance in the short-transverse loading direction [50,82,83]. Smooth tensile samples in 0.6M NaCl under alternate immersion conditions showed EIC failures at stresses as low as 70 MPa [82] at only 15% of the yield stress. Alcoa introduced a duplex heattreatment process, -T73 [84] which effectively eliminated EIC issues for AA7075 sheet material, although this was at the expense of a 15% strength loss penalty.…”

Section: Rosenhain and Archbuttmentioning

confidence: 99%

“…The many EIC issues in aircraft structures during the 1960's and early 1970's [32,82] led to unprecedented levels of R&D funding from US Government Agencies during the mid-1960's, through the 1970's and into the early 1980's for the aluminum industry, aircraft manufactures and various research laboratories to study and develop commercial high strength aluminum alloys, focusing on thick-gauge forgings and extrusions.…”

Section: Eic In 2 Nd Generation Commercial Aluminum Alloys Mid-1960's...mentioning

confidence: 99%

“…The alloy strengths significantly increase with rare-earth addition for alloys containing both Zr and Cr additions, but not when either Zr or Cr addition is absent. The viability of using Zr and Cr additions in 3 rd Generation 7xxx series alloy thick-section alloy products is under evaluation, as a Cr addition can provide potential EIC benefits in its own right [52,75,82,[183][184][185]. However, potential 'quench-sensitivity' issues could limit the usefulness of rare-earth additions in thick-section 4 th Generation commercial alloys.…”

Section: Th Generation Al-zn-mg-cu Alloysmentioning

confidence: 99%

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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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Section: Rosenhain and Archbuttmentioning

confidence: 99%

Section: Rosenhain and Archbuttmentioning

confidence: 99%

Section: Eic In 2 Nd Generation Commercial Aluminum Alloys Mid-1960's...mentioning

confidence: 99%

Section: Th Generation Al-zn-mg-cu Alloysmentioning

confidence: 99%

See 2 more Smart Citations

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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A Novel Solution Heat Treatment of 7075‐Type Alloy

Ibrahim¹,

Samuel²,

Alkahtani³

et al. 2013

Light Metals 2013

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The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

Thompson

Bernstein

1980

Advances in Corrosion Science and Technology

124

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INTRODUCTIONThis chapter focuses on two kinds of environmental fracture, stress corrosion cracking (SeC) and hydrogen embrittlement, and discusses the role in such failures of a number of metallurgical variables. These include chemical composition; microstructural components such as precipitate type and structure, and grain size and shape; crystallographic texture; heat treatment and its effect on the foregoing variables; and processing, particularly the thermo mechanical treatments (TMT), which are attracting increased attention for property optimization. These variables are expected to be of great importance in the development of new engineering materials to meet demanding service conditions.In recent years, understanding of the role of metallurgical variables in hydrogen embrittlement has improved significantly. One purpose of the present review is to summarize this progress. Since hydrogen is believed to be broadly involved in many environmental cracking phenomena, it is a second purpose of the review to extend that improved understanding to at least some cases of Sec. It might be expected that similar role(s) of metallurgical variables would be observed for both hydrogen embrittlement and hydrogenassisted see, particularly when hydrogen plays a dominant role.The usual definition of see is that both a corrosive environment and a tensile stress (residual or applied) act together to cause cracking, which has a macroscopically brittle appearance. It is implicit in this definition that see is a phenomenon, not a mechanism, and it is so treated in this chapter. Hydrogen embrittlement is also a phenomenon, which mayor may not occur during sec. Hydrogen as a gas or as a species evolved from chemical or electrochemical reactions could be regarded as an see corrodent. But since classical hydrogen embrittlement studies have been conducted with hydrogen dissolved within the metal, which corrodents usually are not, such studies have been cited in the past as evidence against a link between see and hydrogen embrittlement. This review concludes, as have others, that such a conclusion cannot be general. There are now known to be a number of cases in which hydrogen participates in see fracture, and the accepted balance between hydrogen cracking and, say, anodic dissolution as components of see appears to need reappraisal or revision. It is a purpose of this chapter to identify such areas.It should be strongly emphasized that we do not accept the proposition that there must be a single causative process for Sec. There are indeed instances of purely dissolution processes, or purely hydrogen embrittlement processes, giving rise to what is generally described as Sec. But in many cases there appear to be contributions from both types of processes. This chapter emphasizes the hydrogen-related behavior in order to make maximum use of the new understanding of hydrogen embrittlement, but that emphasis should not be construed as being a mechanistic emphasis.The combined literature record on see and hydrogen embrittlement is very exten...

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Stress-corrosion resistance of high-strength Al-Zn-Mg-Cu alloys with and without silver additions

Cited by 12 publications

References 1 publication

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

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

A Novel Solution Heat Treatment of 7075‐Type Alloy

The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

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