Age hardening behavior of TMT processed AlZnMgCu alloy

Conserva, M.; Buratti, M; Russo, E. Di; Gatto, F.

doi:10.1016/0025-5416(73)90050-5

Cited by 34 publications

(14 citation statements)

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“…The attribution of the strength increase above the normal T73 condition to dislocation substructure is supported by transmission electron microscopy observations, as is the conclusion that the precipitates did become overaged. 160 It thus seems evident that TMT sequences deserve thorough investigation [160][161][162] as one means of manipUlating microstructure to develop strong, tough, See-resistant aluminum alloys.…”

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confidence: 99%

The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

Thompson

Bernstein

1980

Advances in Corrosion Science and Technology

125

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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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confidence: 99%

The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

Thompson

Bernstein

1980

Advances in Corrosion Science and Technology

125

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“…In this regard, friction stir processing (FSP) is a severe plastic deformation (SPD) technique based on the concepts of friction stir welding (FSW) [7] capable of producing ultrafine grain sizes (< 1 µm) using appropriate parameters [8][9][10][11][12]. The effects of FSP on the microstructure modification and further mechanical properties and formability have been extensively studied in the Al 7075 alloy [11][12][13][14][15][16][17][18][19][20].…”

Section: Main Bodymentioning

confidence: 99%

Influence of Grain Coarsening on the Creep Parameters During the Superplastic Deformation of a Severely Friction Stir Processed Al-Zn-Mg-Cu Alloy

Orozco‐Caballero

Ruano²,

Carreño³

2017

Metall Mater Trans A

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During grain boundary sliding in ultrafine-grain materials at intermediate temperatures and high strain rates (~10-2 s-1) apparent creep parameters usually deviate from the theoretical values, due to microstructural coarsening. An analysis has been carried out in a severely friction stir processed (FSP) 7075 alloy with three different ultra-fine grain sizes (L), obtaining explicit grain size dependence of the creep parameters n ap =n ap (L) and Q ap =Q ap (L), confirming the validity of the theoretical values of these parameters in the constitutive equation.

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“…More recently, extensive research at our laboratory on Al-Zn-Mg(-Cu) alloys confirmed that these new TMT (T-AHA)* produce alloys that have structures with im- proved properties compared to conventionally heat treated materials. 24 " 31 In addition T-AHA cycles were shown to have a beneficial effect on other heat treat-able aluminum alloys. 32 ' 33 This paper presents a summary of the data obtained on the effect of TMT on the structure-property relationships in Al-Zn-Mg(-Cu) alloys.…”

Section: ) Approachmentioning

confidence: 99%

“…The deformation was applied by rolling or drawing both at room temperature and in the range 130 c to 220 C C with preheating times ranging from 30 s up to 20 min. The first aging step, on the basis of hardness tests, 40 ' 41 was carried out at 100'C for 10 h for the ternary alloys and at 105 r C for 6 h for the quaternary alloy.…”

Section: B) Cycle Selectionmentioning

confidence: 99%