Influence of the Thermomechanical Treatment on the Intergranular Corrosion Susceptibility of Zn-Modified Al-5.1 Wt Pct Mg-0.7 Wt Pct Mn Alloy Sheet

Halap, Akram; Radetić, Tamara; Popović, M.; Romhanji, Endre

doi:10.1007/s11661-014-2386-y

Cited by 14 publications

(10 citation statements)

References 25 publications

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“…These studies are mainly concentrated on some conventional 5xxx series aluminum alloys (such as Al 5083 and Al 5456). Different thermomechanical treatments, local reversion of thermal treatments and microalloying have been utilized to minimize the formation of sensitization. Regarding the study of alloy additions, Vetrano et al and Fuller et al reported that additions of Mn, Zr, and Sc could increase mechanical properties as well as SCC resistance of Al–Mg alloys by hindering recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties, corrosion behavior, and microstructure of Sr modified Al–9.2Mg–0.7Mn alloys

Zhang

Xia

Yan

et al. 2019

Materials & Corrosion

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The influence of strontium (Sr) additions in the form of Mg-Sr master alloys from 0 to 0.6 wt% on the mechanical properties, corrosive nature, and microstructure of Al-9.2Mg-0.7Mn alloys is investigated. The material is studied in a fully annealed (O-temper) and a sensitizing treatment at 150°C for 7 days. Here we demonstrate that there will be a new phase which might be (Al, Mg) 17 Sr 2 formed in the as-cast microstructure. When the Sr content is 0.2 wt%, under the premise that the mechanical properties of completely annealed alloy change little (relative to the matrix: the ultimate tensile strength increases by 8 MPa and the elongation only decrease by 1.6%), the intergranular corrosion resistance is significantly improved. The specific performance is that the mass loss from intergranular corrosion decreases by more than 53% from the addition of 0.2 wt% Sr after sensitizing. K E Y W O R D SAl-Mg alloys, intergranular corrosion, mechanical properties, Sr additions

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Section: Introductionmentioning

confidence: 99%

Mechanical properties, corrosion behavior, and microstructure of Sr modified Al–9.2Mg–0.7Mn alloys

Zhang

Xia

Yan

et al. 2019

Materials & Corrosion

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“…Surface morphology is rough and sponge like, indicating that both elongated grain boundaries and grain interiors were corroded after immersion into the nitric acid (Figure b). It is obvious that IGC susceptibility can be correlated not with the amount of the β‐phase precipitates, but its distribution in the structure as observed earlier for Al‐Mg alloys . Resistance to intergranular corrosion of ARB processed specimens can also be attributed to the existence of passive film formed between ARB layers.…”

Section: Resultsmentioning

confidence: 82%

“…It is obvious that IGC susceptibility can be correlated not with the amount of the β-phase precipitates, but its distribution in the structure as observed earlier for Al-Mg alloys. [42] Resistance to intergranular corrosion of ARB processed specimens can also be attributed to the existence of passive film formed between ARB layers. An increase in number of ARB cycles leads to a larger number of layers and creates better conditions for the formation of a passive film, which increases the corrosion resistance.…”

Section: Intergranular Corrosion Susceptibilitymentioning

confidence: 99%

Mechanical and corrosion properties of AA5083 alloy sheets produced by accumulative roll bonding (ARB) and conventional cold rolling (CR)

Alil

Popović

Bajat

et al. 2017

Materials & Corrosion

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Influence of accumulative roll bonding (ARB) and conventional cold rolling (CR) on the mechanical and corrosion properties of AA5083 alloy sheets has been studied. Tensile tests showed significant increase in strength and a decrease in elongation after each ARB deformation and cold rolling reductions. Results of nitric acid mass loss test (NAMLT) revealed that cold rolled and ARB processed specimens were resistant toward intergranular corrosion (IGC) in as‐deformed state. However, after 7 days of sensitization at 100 and 150 °C, cold rolled material became IGC sensitive, while ARB specimens stayed IGC resistant. IGC susceptibility can be correlated with different morphology and distribution of β‐phase (Mg2Al3) precipitated during sensitization. It was found that extensive shear banding contributed a favorable distribution of β‐phase precipitates in the structure of IGC resistant ARB processed specimens. In case of IGC susceptible conventionally cold rolled specimens, large amount of β‐phase precipitated preferentially along the elongated grain boundaries. Electrochemical parameters were in a good correlation with the results of NAML tests, which in turn, confirmed the superiority of ARB multilayered structure over conventional cold rolled structure in terms of IGC susceptibility and corrosion stability.

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“…Recently, different thermo mechanical treatments [6], alloy additions of Sr, Nd and Zn [5,7,8] and local reversion of thermal treatments [9] have been applied to minimize the formation of the grain boundary Samson phase and sensitization. However, these methods are not effective in preventing the formation of grain boundary Al 3 Mg 2 .…”

Section: Introductionmentioning

confidence: 99%

Suppression of Samson phase formation in Al-Mg alloys by boron addition

Goswami

2017

Materials Letters

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Al-Mg alloys, particularly Al 5083 and Al 5456, are widely used for boat and ship structural applications because of their unique properties such as lightweight, high strength and good weldability. However, structural parts manufactured with these alloys fail catastrophically as a result of the formation of Al 3 Mg 2 , known as Samson phase, at grain boundaries. Here we demonstrate that the Samson phase formation is suppressed in Al 5083 by alloying with B, which traps most of Mg in solid solution as AlMgB 2 phase. This decreases the supersaturation level of Mg in Al matrix, which is a driving force for the formation of Samson phase in Al 5083. We observe Cu-rich precipitates, instead of the Samson phase, at grain boundaries upon extended annealing at 150C. This is a significant finding as it provides new insight as to how to minimize the longstanding problem of sensitization.

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Influence of the Thermomechanical Treatment on the Intergranular Corrosion Susceptibility of Zn-Modified Al-5.1 Wt Pct Mg-0.7 Wt Pct Mn Alloy Sheet

Cited by 14 publications

References 25 publications

Mechanical properties, corrosion behavior, and microstructure of Sr modified Al–9.2Mg–0.7Mn alloys

Mechanical properties, corrosion behavior, and microstructure of Sr modified Al–9.2Mg–0.7Mn alloys

Mechanical and corrosion properties of AA5083 alloy sheets produced by accumulative roll bonding (ARB) and conventional cold rolling (CR)

Suppression of Samson phase formation in Al-Mg alloys by boron addition

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