Microstructure and mechanical properties of Mg-4Zn-0.5Ca alloy fabricated by the combination of forging, homogenization and extrusion process

Kang, Jin-wen; Wang, Cuiju; Deng, Kun-kun; Nie, Kai-bo; Yan, Biao; Li, Weijian

doi:10.1016/j.jallcom.2017.05.232

Cited by 41 publications

(6 citation statements)

References 48 publications

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“…Figure 7 c shows the work hardening rate (

) versus net flow stress

of ECAPed Mg-9Al-1Si-1SiC composites without and with HT. It is clearly observed that there is no initially linear hardening behavior (stage II), only a dynamic recovery stage (stage III) and a large-strain work hardening stage (stage IV) appear in the

– (

) curves of the present alloys [ 21 , 30 , 31 ]. Generally, stage II is related to high dislocation density.…”

Section: Resultsmentioning

confidence: 96%

Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures

Zhang

Wang

et al. 2018

Materials

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Mg-9Al-1Si-1SiC composites with various initial microstructures prior to equal channel angular pressing (ECAP) were obtained by different pre-treatments (without and with homogenization treatment), and the resultant grain size, second phase and tensile properties of ECAPed composites were reported. The ECAPed composite with homogenization treatment (HT) exhibited finer grain size, higher fraction of dynamically recrystallized (DRXed) grains, weaker texture intensity, as well as the presence of dynamic precipitated Mg17Al12 phase compared to that without HT. Besides, the morphology of pre-existing Mg2Si changed from massive-like to needle-like in the ECAPed composite with HT. Room-temperature tensile test results showed that ultimate tensile strength (UTS), yield strength (YS), and elongation (El) of ECAPed composites with HT were 16.1%, 23%, and 27.3% larger than that without HT, respectively.

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“…Figure 7 c shows the work hardening rate (

) versus net flow stress

– (

) curves of the present alloys [ 21 , 30 , 31 ]. Generally, stage II is related to high dislocation density.…”

Section: Resultsmentioning

confidence: 96%

Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures

Zhang

Wang

et al. 2018

Materials

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“…2. As compared with the DRXed regions, the basal plane texture is much stronger in the unDRXed regions [39]. It has been verified that the Mg alloys with strong basal plane texture usually possess the lower corrosion rate for the reason that the basal plane owns stronger atomic bonding and higher atomic coordination [40].…”

Section: Discussionmentioning

confidence: 98%

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Niu

Cao

Deng

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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In order to study the corrosion resistance of extruded magnesium alloys, the Mg-4Zn-2Gd-0.5Ca alloy was extruded at the speed of 0.01-0.1 mm/s with the temperature of 280-360 °C in present study. Hot extrusion results show that the volume fraction of precipitates (V pre ), V DRX (the dynamic recrystallization rate) and the average size of DRXed grain (d DRX ) decrease with the decrease in extrusion speed, and the corrosion rate of the alloy also shows a downward trend. On the contrary, the values of V pre , V DRX and d DRX increase with the increase in extrusion temperature, and the corrosion resistance of Mg-4Zn-2Gd-0.5Ca alloy decreases. When the extrusion speed is 0.01 mm/s and the extrusion temperature is 280 °C, the alloy has the best corrosion resistance. The corrosion of extruded Mg-4Zn-2Gd-0.5Ca alloy occurs preferentially on the magnesium matrix around W and I phases in the DRXed zone. With the further corrosion, the corrosion continues to spread along the phase, and the corrosion area gradually increases. Galvanic corrosion plays a leading role in the corrosion process. Moreover, there are a large number of basal plane textures in the unDRXed region, which is conducive to improving the corrosion resistance of magnesium alloys. In addition, the decrease in grain size also makes the corrosion of magnesium alloy more uniform.

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“…The overall texture intensity is determined by all grains for the as-extruded ZXM alloy with mixed grain microstructure. The basal plane (0002), prismatic I (10-10) and prismatic II (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) regions of the entire specimens, recrystallized and unDRXed regions for the ZXM-270/0.01 9a-i. Overall, after extrusion, the maximum texture intensity (I max ) for all grains is determined as ~ 30.62 mud.…”

Section: Texturementioning

confidence: 99%

“…There has been much attention given to magnesium alloys containing high concentrations of Zn (usually between 3 and 6 wt%) [10][11][12] and low concentrations of Ca (usually between 0.2 and 1 wt%) [13][14][15][16][17][18]. Du et al [10] found that the tensile strength of an as-extruded Mg-6 wt% Zn alloy could be effectively improved by Ca (0.36-0.82 wt%) addition.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [16] investigated the effects of calcium on texture and mechanical properties of hot-extruded Mg-1Zn-Ca (wt%) alloys and found that the increase in Ca concentration could weaken extrusion textures and refine grains, resulting in tensile elongation improvement. Kang et al [17] reported that there is a high dynamic recovery rate at the third stage of the Mg-4Zn-0.5Ca (wt%) alloy, which can be attributed to the large amount of fine recrystallized grains after the combination of forging, homogenization and extrusion process. Hofstetter et al [18] developed a Mg-1Zn-0.3Ca (wt%) alloy which exhibited yield strength of ~ 265 MPa and elongation to failure of ~ 30% after indirect extrusion at 300 °C.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Tensile Properties and Work Hardening Behavior of an Extruded Mg–Zn–Ca–Mn Magnesium Alloy

Nie

Zhu

Munroe

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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A new Mg-2.2 wt% Zn alloy containing 1.8 wt% Ca and 0.5 wt% Mn has been developed and subjected to extrusion under different extrusion parameters. The finest (~ 0.48 μm) recrystallized grain structures, containing both nano-sized MgZn 2 precipitates and α-Mn nanoparticles, were obtained in the alloy extruded at 270 °C/0.01 mm s −1 . In this alloy, the deformed coarse-grain region possessed a much stronger texture intensity (~ 32.49 mud) relative to the recrystallized fine-grain region (~ 13.99 mud). A positive work hardening rate in the third stage of work hardening curve was also evident in the alloy extruded at 270 °C, which was related to the sharp basal texture and which provided insufficient active slip systems. The high work hardening rate in the fourth stage contributed to the high ductility extruded at 270 °C/1 mm s −1 . This alloy exhibited a weak texture, and the examination of fracture surface revealed highly dimpled surfaces. The optimum tensile strength was achieved in the alloy extruded at 270 °C/0.01 mm s −1 , and the yield strength, ultimate tensile strength and elongation to failure were ~ 364.1 MPa, ~ 394.5 MPa and ~ 7.2%, respectively. Fine grain strengthening from the recrystallized fine-grain region played the greatest role in the strength increment of this alloy compared with Orowan strengthening and dislocation strengthening in the deformed coarse-grain regions.

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Microstructure and mechanical properties of Mg-4Zn-0.5Ca alloy fabricated by the combination of forging, homogenization and extrusion process

Cited by 41 publications

References 48 publications

Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures

Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Microstructure, Tensile Properties and Work Hardening Behavior of an Extruded Mg–Zn–Ca–Mn Magnesium Alloy

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