Effect of microalloying with Ca on the microstructure and mechanical properties of Mg-6 mass%Zn alloys

Du, Yuzhou; Qiao, Xiao Guang; Zheng, M.Y.; Wang, D.B.; Wu, Kun; Golovin, I.S.

doi:10.1016/j.matdes.2016.03.025

Cited by 116 publications

(36 citation statements)

References 58 publications

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“…However, the composition of the Mg–Zn–Ca–La alloy was not optimized. The roles of Ca or La content on microstructure and mechanical properties of Mg–Zn alloys were studied in our previous investigations . It was found that grain refinement and dynamic precipitation were strengthened with the increase of Ca addition, which directly gave rise to strength improvement .…”

Section: Introductionmentioning

confidence: 99%

“…The roles of Ca or La content on microstructure and mechanical properties of Mg–Zn alloys were studied in our previous investigations . It was found that grain refinement and dynamic precipitation were strengthened with the increase of Ca addition, which directly gave rise to strength improvement . In contrast, texture randomization was observed after small addition of La in Mg–Zn alloy and had no obvious relationship with La content, which contributed to the enhancement of plasticity .…”

Section: Introductionmentioning

confidence: 99%

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Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Zheng

Qiao

et al. 2017

Adv Eng Mater

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Mg-6Zn-0.7Ca-0.2La (wt%) alloy is cast and extruded in the present study. The microstructure of the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy is investigated via scanning electron microscopy (SEM), transmission electron microscope (TEM) and electron backscattering diffraction (EBSD). Results show that the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy exhibited a balanced strength and ductility with the yield strength of 261 MPa and elongation-to-fracture of 20.7%. The superior strength is mainly attributed to grain refinement and precipitates, whereas the plasticity is ascribed to fine homogenous microstructure and weaker texture. The fine microstructure is obtained in the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy, mainly attributing to the dynamic recrystallization and pinning effects from precipitates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Zheng

Qiao

et al. 2017

Adv Eng Mater

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“…2), the alloy consists of two different intermetallic phases namely Mg3Zn6Y (I-phase) and Ca 2 Mg 6 Zn 3 phase, respectively. According to reported results, weight ratio of Zn/Y and atomic ratio of Zn/Ca are very important in the formation of intermetallic phases in magnesium alloys [18]. If the weight ratio of Zn/Y is higher than 4.38, I-phase is precipitated [19].…”

Section: Fig 2 Eds Analysis Of Two Points (A) a And (B) B Specified Inmentioning

confidence: 95%

“…On the other hand, if the atomic ratio of Zn/Ca is higher than 1.23, then Ca 2 Mg 6 Zn 3 phase is formed; and if the ratio is less than this value, in addition to the formation of Ca 2 Mg 6 Zn 3 , the extra calcium will precipitate as Mg 2 Ca phase [18]. According to the results of ICP analysis, weight ratio of Zn/Y is 5.10 and atomic ratio of Zn/Ca is 2.69, which confirm the formation of I and Ca 2 Mg 6 Zn 3 phases in the microstructure that is quite similar to the result of XRD shown in Fig.…”

Section: Fig 2 Eds Analysis Of Two Points (A) a And (B) B Specified Inmentioning

confidence: 99%

Effect of Extrusion Temperature on Microstructure and Biodegradation Behavior of Mg-5Zn-1Y-1Ca Alloy

Jafari¹,

Mohammadi²

2017

IJCEA

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Abstract-In this years, many researches on the biodegradable behavior of Mg and its alloys has been done. Low corrosion resistance of the magnesium alloys has led to search a new generation of magnesium alloys for better strength, ductility, and high corrosion resistance. In this study, Mg-5Zn-1Y-1Ca alloy was fabricated by melting process and hot extrusion (at 300, 330 and 370 °C). The effect of temperature of extrusion on microstructure and degradation behavior of Mg-5Zn-1Y-1Ca alloy were investigated by optical microscopy, scanning electron microscopy with an energy dispersive X-ray spectroscopy, X-ray diffraction, immersion test and electrochemical test. The results showed that Mg-Zn-Y-Ca alloy was composed of α-Mg, Mg 3 YZn 6 phase and Ca 2 Mg 6 Zn 3 particles. Immersion and electrochemical tests showed that extruded Mg-5Zn-1Y-1Ca alloy at 330 °C exhibited the best degradation resistance from other alloys in this study.

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“…The constituent of the gray precipitate (marked N) is inferred as Mg 2 Cu and CuMgZn phase according to the XRD. According to the formation mechanism of the lamellar structure reported by Du et al [23] , it is reasonable to assume that the creation of lamellar structure of the alloy with more Cu (≥ 2.0%) is due to the addition of Cu causing intensive constitutional undercooling ahead of the solid/liquid interface in the liquid layer, promoting the primary α-Mg phase solidification and the increase of Cu and Zn concentration in the liquid. As a result, the composition ahead of the solid/liquid interface attains the eutectic composition and matches within a zone of the coupled eutectic growth.…”

Section: As-cast Microstructurementioning

confidence: 97%

Effects of Cu addition on microstructure and mechanical properties of as-cast Mg-6Zn magnesium alloy

Zhang

Huang

et al. 2017

China Foundry

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F or decades, magnesium alloys have wide applications in the aerospace, transportation and mobile electronics industries due to their advantages such as extremely low density and good damping capacity, high specific strength and stiffness, excellent machinability and good castability [1][2][3][4] . However, commercial magnesium alloys provide limited mechanical properties, which hinder their widespread applications [5] . More particularly, to the best of our knowledge, the Mg-Zn binary alloys possess coarse dendritic microstructures, extensive hot cracking tendency, critical shrinkage cavities and porosities. These drawbacks will significantly worsen the mechanical properties of the alloy [6] . The improvement of mechanical properties is a severe and urgent challenge in magnesium alloys research fields. He et al. [7] found that the mechanical properties of magnesium alloys can be significantly improved via appropriate microalloying due Abstract:The application of Mg-Zn binary alloys is restricted due to their developed dendritic microstructure and poor mechanical properties. In this study, an alloying method was used to improve the mechanical properties of Mg-Zn alloy. The Mg-6Zn magnesium alloys microalloyed with varying Cu content (0, 0.8, 1.5, 2.0 and 2.5wt.%) were fabricated by permanent mould casting, and the effects of Cu content on the microstructure and mechanical properties of as-cast Mg-6Zn alloys were studied using OM, SEM, XRD and tensile tests at room temperature.The obtained results show that the addition of Cu not only can refine the grains effectively, but also can modify the eutectic morphology and improve the mechanical properties of the alloys. The main phases of the studied alloys include α-Mg, MgZn 2 , Mg 2 Cu and CuMgZn. When the content of Cu exceeds 0.8wt.%, Mg 2 Cu phase appears. Meanwhile, the eutectic morphology is modified into dendritic shape or lamellar structure, which has an adverse effect on the tensile properties. Furthermore, among the investigated alloys, the alloy containing 0.8% Cu shows an optimal ultimate tensile strength of 196 MPa, while the alloy with 1.5wt.% Cu obtains an excellent elongation of 7.22%. The experimental alloys under different Cu contents show distinguishing fracture behaviors: the fracture of the alloy with 0.8wt.% Cu reveals a mixed mode of inter-granular and quasi-cleavage, while in other investigated alloys, the fracture behaviors are dominated by cleavage fracture. to grain refinement and microstructure modification in the as-cast condition. In order to improve the microstructure and mechanical properties of Mg-Zn binary alloys, many attempts have been devoted to the research and development of high-performance new Mg-Zn based alloys. For example, Mg-Zn-Zr, Mg-Zn-RE, Mg-Zn-Cu and Mg-Zn-Al-Mn alloy systems have been developed and widely applied for some industrial products. There are some minor alloying element investigations in Mg-Zn binary alloys, for instance, adding Ag, Zr, rare earth (RE) or Cu to the Mg-Zn alloy system [8] . It is noteworthy th...

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Effect of microalloying with Ca on the microstructure and mechanical properties of Mg-6 mass%Zn alloys

Cited by 116 publications

References 58 publications

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Effect of Extrusion Temperature on Microstructure and Biodegradation Behavior of Mg-5Zn-1Y-1Ca Alloy

Effects of Cu addition on microstructure and mechanical properties of as-cast Mg-6Zn magnesium alloy

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