Effects of welding parameters and post-heat treatment on mechanical properties of friction stir welded AA2195-T8 Al-Li alloy

Zhang, J.; Feng, Xiaosong; Gao, Jicheng; Huang, He; Ma, Zhi; Li, Guo

doi:10.1016/j.jmst.2017.11.033

Cited by 85 publications

(34 citation statements)

References 22 publications

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“…On the other hand, both δ′ and β′ phases have low electrochemical activity, i.e. high corrosion potential, but they were both the strengthening phases of Al-Li alloy [23,34]. Therefore, during the corrosion process, the joint performance did not show a completely linear relationship with the corrosion, see Figure 6, due to the consumption of T 1 and S′.…”

Section: Discussionmentioning

confidence: 99%

“…Yi et al [31] showed that the effect of δ′ and β′ phase on local corrosion was relatively small, while the uniform corrosion was the main phenomenon. The microstructural characterization and mechanical properties of Al-Li alloy with FSW joints were studied by many researchers [32][33][34], however, the major concerns remained was about the corrosion behavior of the alloy. Li et al [35] and Huang et al [36] studied the intergranular corrosion behaviors of 2195 Al-Li alloy and found that the intergranular corrosion of the alloy was related to T 1 phase.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…A significant amount of work has been conducted in the past years to understand the effect of rotational speed and welding speed in friction stir welding [37][38][39][40]. Arbegast et al [41] considered rotational speed and welding speed are strong function of maximum temperature and rate of heat input, respectively, and they proposed pseudo heat index which is given by Eq.…”

Section: Shi and Wumentioning

confidence: 99%

“…This temperature is sufficient for recrystallization and forms fine equiaxed grains. Zhang et al [40] investigated grain morphology of friction stir welded joint of AL-Li alloy 2198 T8 in SZ and TMAZ and observed that microstructure of these zone changes from fine equiaxed grain and lathy bent grain to coarse columnar in as-welded condition to PWHT. Jata and Semiatin [62] established the mechanism of microstructure evolution in the stir zone of Al-Li alloy.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

“…The hardness value increases with increasing rotation speed or decreasing welding speed due to more exposure time. Zhang et al [40] applied different x and m combinations with the same ratio of x/m and they found a similar stir zone and thermo-mechanical zone, but different width of the HAZ. Ma et al [51] observed that the microhardness decreases with the increase of x/m.…”

Section: Microhardnessmentioning

confidence: 99%

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Fabrication of third generation Al–Li alloy by friction stir welding: a review

Alam

Sinha

2019

Sādhanā

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Aerospace industry stimulates research for new materials to reduce the weight of it thereby reduction of fuel consumption. Aluminium-Lithium alloys have become a good alternative due to its inherent properties. Nevertheless, joining of these materials by traditional welding is difficult. Friction stir welding process considered as an ideal joining process for these materials due to low heat input. This paper reviews the fabrication of the latest generation of Al-Li alloy by friction stir welding. In addition, it also presents and discusses the effect of process parameters on microstructure, mechanical properties and precipitate distribution in friction stir welded joint of Al-Li alloy.

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