Age-hardening response of AlMgZn alloys with Cu and Ag additions

Stemper, Lukas; Tunes, Matheus A.; Oberhauser, Paul; Uggowitzer, Peter J.; Pogatscher, Stefan

doi:10.1016/j.actamat.2020.05.066

Cited by 67 publications

(24 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These distinct spots in-between the Al lattice can be directly attributed to the crystallographic signal of the T-phase in the crossover AlMgZn alloy. A recent work by some of the present authors [78] has shown that different heat treatments affect T-phase precipitation in the crossover AlMgZn alloy: in an underaged condition (398 K for 3 h) no T-phase diffraction spots were observed while in an overaged condition (like in this work) T-phase diffraction spots were present in the SAED patterns. These observations were supported by STEM-EDX mapping of the different alloy microstructures.…”

Section: Alloy Preirradiation Characterizationsupporting

confidence: 59%

“…Using the recently introduced lightweight alloy design strategy known as "crossover alloying," [75][76][77][78] the metallurgical merging of the beneficial properties from 5xxx (AlMg) with the 7xxx (AlZn) alloy series such as high formability and high strength, respectively, this paper is aimed at investigating the heavy ion irradiation response of a distinct crossover alloy herein developed: the overaged AlMg 4.7 Zn 3.4 (in wt%). Age-hardening for this alloy was achieved through the controlled and finely dispersed precipitation of the T-phase-Mg 32 (Zn,Al) 49 [79,80] -which consists of an intermetallic superstructure.…”

Section: Main Objectives Of This Present Workmentioning

confidence: 99%

“…A brighter HAADF signal from such particles is The T-phase crystal structure herein presented was simulated within the CrystalMaker software using existing reference literature data. [75][76][77][78][79][80][83][84][85] The orientation relationship shown in the figure was by Ryum as (011) T-phase ||(001) Al . [86] noted when compared with the Al matrix.…”

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

“…As shown in Figure 4, the combination between Mg and Zn in this alloy system gives rise to the precipitation of Tphase which is of cubic crystal structure with reported stoichiometry of Mg 32 (Zn,Al) 49 . [75][76][77][78][79][80][83][84][85] It is worth emphasising that in the EDX maps exhibited in Figure 4, T-phase precipitates show Mg and Zn enrichment and most of them have sizes within the range from 10 to 200 nm. A particular aspect of the T-phase precipitation in the crossover AlMgZn alloy microstructure is that when the pre-irradiated sample is screened within the TEM along the [001]-FCC Al zone axis, sharp diffraction spots corresponding to the T-phase can be observed either using fast Fourier transformation (FFT) from HRTEM micrographs or in selected-area electron diffraction (SAED) patterns.…”

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

“…These observations were supported by STEM-EDX mapping of the different alloy microstructures. Using the software CrystalMaker, [87] a crystallographic model for the T-phase was generated (as shown in Figure 4) using data available in the literature [75][76][77][78][79][80][83][84][85] and the crystallographic signals found were properly indexed in a method reported elsewhere. [77,78] The crystallographic data files (.cif) -used both to generate such models and perform crystallographic indexing of the T-phase in this alloy systemare available on the Mendeley dataset linked with this study (see Section 5).…”

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

See 4 more Smart Citations

Prototypic Lightweight Alloy Design for Stellar‐Radiation Environments

et al. 2020

Self Cite

View full text Add to dashboard Cite

The existing literature data shows that conventional aluminium alloys may not be suitable for use in stellar-radiation environments as their hardening phases are prone to dissolve upon exposure to energetic irradiation, resulting in alloy softening which may reduce the lifetime of such materials impairing future human-based space missions. The innovative methodology of crossover alloying is herein used to synthesize an aluminium alloy with a radiation resistant hardening phase. This alloy-a crossover of 5xxx and 7xxx series Al-alloys-is subjected to extreme heavy ion irradiations in situ within a TEM up to a dose of 1 dpa and major experimental observations are made: the Mg 32 (Zn,Al) 49 hardening precipitates (denoted as T-phase) for this alloy system surprisingly survive the extreme irradiation conditions, no cavities are found to nucleate and displacement damage is observed to develop in the form of black-spots. This discovery indicates that a high phase fraction of hardening precipitates is a crucial parameter for achieving superior radiation tolerance. Based on such observations, this current work sets new guidelines for the design of metallic alloys for space exploration.

show abstract

Section: Alloy Preirradiation Characterizationsupporting

confidence: 59%

Section: Main Objectives Of This Present Workmentioning

confidence: 99%

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

Section: Alloy Preirradiation Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Prototypic Lightweight Alloy Design for Stellar‐Radiation Environments

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

Metallographic Etching of Al–Mg–Zn–(Cu) Crossover Alloys

Samberger,

Kremmer,

Stemper

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

Various alloys demand customized etchants due to their diverse chemical compositions, particularly in the realm of aluminum alloys. Consequently, this study proposes a technique for metallographic visualization of small grain structures within Al‐Mg‐Zn‐(Cu) crossover alloys. The method relies on a thermal pre‐treatment combined with an etching process. The study primarily seeks to comprehend how grain boundary precipitation affects etchability, addressing the complexities of characterizing these alloys. The demonstrated approach facilitates the swift assessment of grain sizes <10 µm using light optical microscopy. Exploring the etchability of Al‐Mg‐Zn‐(Cu) crossover alloys across a standard heat treatment pathway identifies the optimal treatment and suitable etchant for grain visualization. Through process refinement, a reduction in processing time is achieved by employing a single‐step preheat treatment lasting 20 minutes at 180 °C post solution annealing. Transmission electron microscope analysis reveals continuous occupancy of the grain boundary with T‐phase as the key factor influencing the alloy’s etchability. Grain size assessment involves line intercept counting and euivalent circle diameter (ECD) measurement for precise characterization.This article is protected by copyright. All rights reserved.

show abstract