Effect of annealing temperature on microstructure, mechanical properties and corrosion behavior of Al-Mg-Mn-Sc-Zr alloy

Tang, Zhongqin; Jiang, Feng; Long, Mengjun; Jiang, Jingyu; Liu, Huifang; Tong, Mengmeng

doi:10.1016/j.apsusc.2020.146081

Cited by 59 publications

(17 citation statements)

References 57 publications

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“…In stage III (192 < t 384 h), after a long exposure time, a large amount of corrosion products has been generated and accumulated, but because the amount of insoluble corrosion products was larger than the amount of the corroded metal, this was resulting in 'wedge effect' [20,47,48], see figures 3(g) and (h), which supported by the uncorroded metal in the upper layer and caused layer peeling [39,49], the decreased of the effective cross-sectional area made the tensile strength decline rapidly.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 3(b) shows that there are many corrosion pits after 24 h EXCO corrosion, which indicates that the corrosion phenomenon originates from pitting, even in EXCO tests in strong acid solutions. Tang et al [47] and Ding et al [48], reported that the corrosion of aluminum alloy in EXCO solution was mainly initiated by pitting, and finally developed into exfoliation corrosion. With time, the corrosion products accumulate continuously, as shown in figures 3(c) and (d).…”

Section: Materials and Experimental Workmentioning

confidence: 99%

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Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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This research aims to investigate the effect of the exfoliation corrosion exposure time on the mechanical properties, the strength and elongation, of friction stir welded Al-Li alloy type 2195-T8. The exfoliation corrosion test was performed using the exfoliation corrosion (EXCO) solution, based on ASTM G34. The samples were exposed to different exposure times 24,48, 96, 192 and 384 h. The results showed that both the strength and elongation of the welded specimens-exposed to the exfoliation corrosion tests-were reduced. For example, the samples that were exposed to 384 h, their initial tensile strength and elongation were reduced by 13% and 17% respectively. The degradation process due to the exfoliation corrosion on the tensile strength was divided into three stages: fast (0-96 h: 443.7 MPa-416.3 MPa, the degraded rate was 0.29 MPa/h), steady (96-192 h: 416.3 MPa-413.4 MPa, the degraded rate was 0.03 MPa h −1 ) and medium rate MPa, the degraded rate was 0.14 MPa h −1 ). For the elongation, in general, the reduction was similar to the style of strength, but with different rates. The TEM images showed that this degradation was due to the dissolution of T 1 (Al 2 CuLi) and S′ (Al 2 CuMg) phase. Also, the corrosion products and their role of adherence on the surface of the tested specimens were investigated. An empirical equation p-t (mechanical properties-exposure time) was established to calculate the effect of exposure corrosion time on the performance of welded specimens.

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Section: Discussionmentioning

confidence: 99%

Section: Materials and Experimental Workmentioning

confidence: 99%

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Baiyao

Zhang

Khoshnaw

2020

Mater. Res. Express

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“…Due to the higher electric potential of β phase than that of the Al-Mg-Mn alloy matrix, β phase can be resolved in a corrosive medium in the first place. The corrosion situation of the alloy in a corrosive solution mainly depends on the distribution, size, and amount of β phase (Wang et al, 2012). Research has verified that an Al alloy with Mg content no more than 3.5% does not exhibit thin layers of intergranular precipitation networks annealed at any temperatures after cold rolling process (Brown, 1972).…”

Section: The Influence Of Annealing Temperature On Intergranular Corrosion Resistance Of the Sc-containing Alloymentioning

confidence: 99%

The Influence of Annealing Temperature on Microstructure, Mechanical Properties, and Corrosion Resistance of Al-6Mg-0.4Mn-0.14Sc-0.12Zr Alloy Cold Rolling Plate

Jiang

Liu

et al. 2020

Front. Mater.

Self Cite

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An Al-6Mg-0.4Mn-0.14Sc-0.12Zr alloy with a low Sc content was developed. The mechanical properties and corrosion resistance of the Al-6Mg-0.4Mn-0.14Sc-0.12Zr alloy cold rolling plate which annealed at different temperatures were studied and discussed. Based on OM, SEM, EDS, and TEM techniques, the influence of annealing temperature on the microstructure of the alloy was studied. An Sc-free alloy was also developed as the control group. A comparison between the Sc-containing alloy and the control group was carried out on the mechanical properties and the microstructural characteristics for different processing conditions. In conclusion, when increasing annealing temperature, the corrosion resistance decreases first, and then increases. When annealed at 200 • C for 2 h, Al 3 Mg 2 phase is precipitated continuously along the grain boundary, leading to the lowest corrosion resistance. When annealed at 350 • C for 2 h, the Al 3 Mg 2 phase is not observed along the grain boundary, leading to a relatively high corrosion resistance. Moreover, the effective pinning of the grain boundaries by Al 3 (Sc,Zr) particles constrains the recrystallization. As a result, a preferable combination performance of the Sc-containing alloy cold rolling plate can be obtained with the tensile strength of 437 MPa, the yield strength of 318 MPa, the elongation of 14.8%, and the corrosion resistance of 0.029 mm•a −1 . The research findings provide theoretical and experimental support for the industrial production of Al-Mg-Mn-Sc-Zr alloys with low Sc content.

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“…In the subsequent storage, transportation, and molding, the alloy is subject to serious loss. Therefore, in the industry, the processed shapes need to be subjected to stabilizing treatment or process annealing [7]. However, the annealing temperature of the process has a significant impact on the recrystallization and corrosion properties.…”

Section: Introductionmentioning

confidence: 99%

“…However, the annealing temperature of the process has a significant impact on the recrystallization and corrosion properties. When the process annealing is lower than 350 • C, the corrosion resistance of the alloy will be greatly reduced [7,8]. On the contrary, when the annealing temperature is too high, the recrystallized grains will start to grow abnormally and have an adverse effect on the subsequent formability [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Trace Amounts of Mn, Zr and Sc on the Recrystallization and Corrosion Resistance of Al-5Mg Alloys

et al. 2021

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This study aimed to explore the effects of trace amounts of Mn, Zr, and Sc on the recrystallization behavior and corrosion resistance of Al-5Mg alloys after process annealing by means of alloy design and microstructure analysis of electron backscatter diffraction (EBSD), electron microprobe (EPMA), and electron microscopes (TEM and SEM). The main objective was to obtain alloys with better corrosion resistance. The results show that the fine Al3Zr and Al3Sc precipitated particles were both superior to the MnAl6 particles in inhibiting grain and sub-grain boundary migrations. Therefore, the Zr-containing and Sc-containing alloys were better than the Mn-containing alloy in inhibiting recrystallization. For further comparison, the thermal stability of the Al3Sc particles was better than that of the Al3Zr particles, so the Sc-containing alloy at the high temperature above 350 °C inhibited grain growth better than the Zr-containing alloy. During the recovery stage of the alloy in the recrystallization process, the β-Mg2Al3 phase precipitated on the sub-grain boundary, thus reducing the occurrence of intergranular corrosion. However, in the initial stage of recrystallization, the β-Mg2Al3 phase continuously precipitated on the grain boundary, causing obvious intergranular corrosion. For the Sc-containing alloy, because there was no obvious grain growth stage, the β-Mg2Al3 phase continuously precipitated on the grain boundary, and thereby intergranular corrosion occurred. Therefore, its corrosion resistance was greatly reduced. By contrast, for the alloy containing Mn or Zr, because of obvious grain growth, magnesium atoms aggregated. As a result, the β-Mg2Al3 phase discontinuously precipitated on the grain boundary. The corrosion morphology was local pitting corrosion rather than intergranular corrosion, and thus the corrosion resistance of the alloy was enhanced. As a novelty, this study clearly observed the sensitized precipitation and corrosion morphology of the β-Mg2Al3 phase of Al-5Mg alloy under different recrystallization methods. This will be of benefit to the design of anti-corrosion measures for the future manufacturing and application of Al-5Mg alloy.

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Effect of annealing temperature on microstructure, mechanical properties and corrosion behavior of Al-Mg-Mn-Sc-Zr alloy

Cited by 59 publications

References 57 publications

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

Mechanical behavior associated with metallurgical aspects of friction stir welded Al–Li alloy exposed to exfoliation corrosion test

The Influence of Annealing Temperature on Microstructure, Mechanical Properties, and Corrosion Resistance of Al-6Mg-0.4Mn-0.14Sc-0.12Zr Alloy Cold Rolling Plate

Effects of Trace Amounts of Mn, Zr and Sc on the Recrystallization and Corrosion Resistance of Al-5Mg Alloys

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