Microstructure evolution of Cu–30Zn during friction stir welding

Liu, Xiaochao; Sun, Yingjuan; Nagira, Tomoya; Ushioda, Kohsaku; Fujii, Hidetoshi

doi:10.1007/s10853-018-2313-5

Cited by 35 publications

(72 citation statements)

References 39 publications

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“…During FSW due to the presence of heat and deformation, dynamic restoration mechanisms such as dynamic recrystallization generate the new fine grains inside the SZs [16,[22][23][24][25][26]. Recently, it is demonstrated that both the continuous and discontinuous dynamic recrystallization (CDRX and DDRX) occur during FSW of brasses [9,10,27]. It is believed that with increasing the Zn content in brasses and using lower heat inputs during FSW, the DDRX fraction increases during grain structure formation [16,24].…”

Section: Resultsmentioning

confidence: 99%

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Heidarzadeh

Paidar

Güleryüz

et al. 2020

Archiv.Civ.Mech.Eng

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Nanoindentation test was employed to measure the actual hardness and yield strength of the stir zone in the friction stirwelded single-phase brass joints. For this aim, different joints were prepared according to an experimental matrix based on the central composite rotatable design. In this design matrix, the tool rotational speed, tool traverse speed, and tool axial force were the input parameters. The outputs were the hardness and yield strength of the joints. To measure the hardness and tensile strength of the joints, the nanoindentation test was employed. Moreover, electron back scattered diffraction and transmission electron microscopy techniques were used to study the microstructural features. The results showed that by decreasing rotational speed and axial force, and by increasing the traverse speed, the hardness and yield strength of the joints were increased. In other words, lower heat inputs caused higher strength in the joints. Finer grain sizes, larger grain average misorientation amounts, i.e., existence of more dislocations, and greater Taylor factors in the lower heat input joints revealed that the influence of grain boundaries, dislocations, and texture were the origins of better mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Heidarzadeh

Paidar

Güleryüz

et al. 2020

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

show abstract

“…They were supplied as 3-mm-thick sheets and then machined into small workpieces with the dimensions of 200 mm in length and 50 mm in width by shearing and milling. Figure 1a shows the welding procedure, which has been documented in detail in our previous papers [25]. Two workpieces were butted, and a foil was inserted into the faying surface as marker material.…”

Section: Methodsmentioning

confidence: 99%

“…However, it is worth mentioning that this synchronous rapid cooling only cooled the weld exposed to the liquid CO 2 . The lower region of the weld still underwent a short-time annealing [25,29]. This is because the material flow terminated immediately once the material migrated to the rear side of the tool pin, but the liquid CO 2 was still shielded by the shoulder.…”

Section: Methodsmentioning

confidence: 99%

“…Unfortunately, many studies did not pay attention to this issue. Recently, Liu et al [24][25][26] have developed a quasi-in situ method to evaluate the dynamic development of grain structure and texture during the FSW. In this method, a foil which is similar to the base material is inserted into the butting surface of the workpieces as marker material to show the streamline of material flow.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, the microstructure development during the welding process can be captured. By using this method, Liu et al investigated the grain structure and texture development during the FSW of pure aluminum [27], pure copper [25,26], pure iron [28] and Cu-30Zn brass [29], respectively. However, the effect of SFE on the grain structure development at different welding stages has not yet been summarized.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding

Liu

Sun

Nagira

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The effect of stacking fault energy (SFE) on the grain structure evolution of face-centered cubic metals during friction stir welding was investigated by using pure aluminum, pure copper and Cu-30Zn alloy as experiment materials. Tool "stop action" and rapid cooling were employed to "freeze" the microstructure of the flowing materials around the tool. Marker materials were used to show the streamline of the material flow. The microstructures of the three materials at different welding stages were contrastively studied by the electron backscatter diffraction technique. The results show that at the material flow stage, as the SFE decreases, the grain structure evolution changes from the continuous dynamic recrystallization to discontinuous dynamic recrystallization, and further to the dynamic equilibrium between the annealing twinning due to thermally activated grain boundary migration and the twin destruction during the plastic deformation. Owing to different grain structure evolution mechanisms, the grain structure at the end of the material flow is greatly different. Especially in copper, a lot of dislocations remain, which gives rise to the static recrystallization occurring during the subsequent cooling stage.

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A comparative study on hot deformation and solid-state bonding behavior of aluminum alloys for the integration of solid-state joining and forming processes

Zhao

Chen

et al. 2019

Int J Adv Manuf Technol

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Microstructure evolution of Cu–30Zn during friction stir welding

Cited by 35 publications

References 39 publications

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Effect of Stacking Fault Energy on the Grain Structure Evolution of FCC Metals During Friction Stir Welding

A comparative study on hot deformation and solid-state bonding behavior of aluminum alloys for the integration of solid-state joining and forming processes

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