Effects of Severe Cold Rolling on Exfoliation Corrosion Behavior of Al-Zn-Mg-Cu-Cr Alloy

Lin, Liangwu; Liu, Zhiyi; Li, Yao; Han, Xiangnan; Chen, Xu

doi:10.1007/s11665-011-9978-0

Cited by 16 publications

(5 citation statements)

References 20 publications

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“…Because of the limited solubility of Cu and Mg in the Al matrix, the highest strength of aged Al-Cu-Mg alloys is essentially restricted to precipitation strengthening and plastic deformation is considered to be an effective method to further strengthen Al-Cu-Mg alloys [1,5]. However, these positive factors for strength enhancement-such as the precipitates formed during aging and the grain boundaries and dislocations formed during plastic deformation-play a negative role in corrosion resistance [6][7][8]. Considering that corrosion is strongly related to the surface states of a material, the modification of surface would be effective to improve the overall performance of the material.…”

Section: Introductionmentioning

confidence: 99%

Surface modifications of a cold rolled 2024 Al alloy by high current pulsed electron beams

Yan

Zou

Zhang

et al. 2020

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Surface modifications of a cold rolled 2024 Al alloy by high current pulsed electron beams

Yan

Zou

Zhang

et al. 2020

Applied Surface Science

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“…Previous studies showed that the rolled specimen had a high resistance to IGC coming from the confluence of refined grain size and the fraction of low-angle grain boundaries [17,25,26]. In this study, it was revealed that the effect of grain size on IGC needs to be considered depending on the sensitization heat treatment which affects the formation of anodic β-Mg 2 Al 3 precipitation at the grain boundary.…”

Section: Discussionmentioning

confidence: 89%

“…In this research, the IGC susceptibility of sensitized Al-6Mg alloy with two different cold rolling conditions was studied. It is not yet clearly understood how the cold rolling process affects the corrosion behavior [17]. D'Antuono et al observed that an increased rolling reduction increased the growth rate of β precipitation due to lowering nucleation temperature [18].…”

Section: Introductionmentioning

confidence: 99%

Intergranular Corrosion and Microstructural Evolution in a Newly Designed Al-6Mg Alloy

et al. 2021

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In this work, the microstructure and corrosion behavior of a novel Al-6Mg alloy were investigated. The alloy was prepared by casting from pure Al and Mg+Al2Ca master alloy. The ingots were homogenized at 420 °C for 8 h, hot-extruded and cold-rolled with 20% reduction (CR20 alloy) and 50% reduction (CR50 alloy). The CR50 alloy exhibited a higher value of intergranular misorientation due to a higher cold rolling reduction ratio. The average grain sizes were 19 ± 7 μm and 17 ± 9 μm for the CR20 and CR50 alloys, respectively. An intergranular corrosion (IGC) behavior was investigated after sensitization by a nitric acid mass-loss test (ASTM G67). The mass losses of both the CR20 and CR50 alloys were similar at early periods of sensitization, however, the CR20 alloy became more susceptible to IGC as the sensitization time increased. Grain size and β phase precipitation were two critical factors influencing the IGC behavior of this alloy system.

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“…Exfoliation corrosion appears to be another bifilm phenomenon, being a form of intergranular corrosion associated with Al alloys which have been rolled or extruded to produce an elongated grain texture [ 32 ]. The corrodent can ingress those bifilms which happen to intersect and emerge at the surface of the metal, penetrating and spreading along the unbonded central interfaces of the bifilms and corroding away their residual points of attachment, until whole flakes of alloy detach from the surface.…”

Section: Texturesmentioning

confidence: 99%

A Personal View of Microstructure and Properties of Al Alloys

Campbell

2021

Materials

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This paper presents a personal view by the author of the role of bifilms in Al alloys. The mantra ‘microstructure determines properties’ is widely accepted as a truism, but is here critically assessed and found wanting. The case is made that bifilms from the casting process, while often invisible in the microstructure, are usually at least as important, if not of far greater importance, because they are often present as a dense population of cracks throughout the metal. The bifilm population controls the morphology of many features of cast and wrought structures. For cast alloys, bifilm control of pore morphology and Si morphology in Al–Si alloys is discussed, as is dendrite arm spacing (DAS). The tensile property benefits of grain refinement are seen to be mainly bifilm controlled. The properties ductility and fatigue appear to be especially dominated by bifilm content, as are invasive corrosion processes such as pitting, intergranular corrosion, hydrogen blistering and cracking. Bifilm control is proposed as a new concept permitting the improvement and control of metallurgical properties.

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Effects of Severe Cold Rolling on Exfoliation Corrosion Behavior of Al-Zn-Mg-Cu-Cr Alloy

Cited by 16 publications

References 20 publications

Surface modifications of a cold rolled 2024 Al alloy by high current pulsed electron beams

Surface modifications of a cold rolled 2024 Al alloy by high current pulsed electron beams

Intergranular Corrosion and Microstructural Evolution in a Newly Designed Al-6Mg Alloy

A Personal View of Microstructure and Properties of Al Alloys

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