Effects of minor Sr addition on microstructure, mechanical and bio-corrosion properties of the Mg-5Zn based alloy system

Cheng, Ming; Chen, Jihua; Yan, Hongge; Su, Bin; Yu, Zhou; Xia, Weijun; Gong, Xiaole

doi:10.1016/j.jallcom.2016.08.164

Cited by 78 publications

(35 citation statements)

References 22 publications

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“…When tensioned, the second phase was subject to tensile stress, which readily generated microcracks, and the second phase fell off from the accumulated sites, resulting in the weakening of the strength and elongation of the alloy [12]. On the other hand, Mg 6 Ca 2 Zn 3 and Mg 17 Sr 2 are brittle phases, and such phases increased with increasing Sr content, which led to the decrease of strength and elongation [10].…”

Section: As-cast Microstructuresmentioning

confidence: 99%

“…In recent years, the Sr-containing magnesium alloys have raised attention from magnesium researchers. The effects of Sr content (0-1 weight%) on microstructures and mechanical properties of magnesium alloys, such as AZ91 [7], AZ91-0.5RE [8], ZA84 [9] and Mg-5Zn [10], have been studied. The results indicate that the addition of Sr can refine grain size and re-distribute second phases, thus improving strength, elongation and other mechanical properties of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Sr addition on microstructures and mechanical properties of Mg-1Zn-1Ca-xSr alloys

Geng-Yi

Guo

Teng

et al. 2020

Mater. Res. Express

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The Sr-containing magnesium alloys have unique characteristics and demonstrate potentials to broaden the application of magnesium alloys. The microstructures and room temperature tensile properties of the as-cast Mg-1Zn-1Ca-xSr (x=0.1, 0.5, 1.5, 2.5 weight%) alloys were investigated in this study. The results indicated that the grains of the Sr-containing alloys were gradually refined and the quantity of second phases was obviously increased with increasing the Sr content. In addition, the phase constituents of the alloys were found to be α-Mg, Mg 2 Ca, Mg 6 Ca 2 Zn 3 and Mg 17 Sr 2 . The tensile results at room temperature showed that the tensile strength and elongation increased for low Srcontent alloys, but didn't change or even decreased a little for high Sr-content alloys. The yield strength changed little with increasing Sr content. The alloy with 0.1% Sr exhibited the best comprehensive properties, with yield strength of 65.69 MPa, tensile strength of 118.23 MPa and elongation of 2.45%. Fracture analysis showed that the fracture mode of the alloys was mainly quasi-cleavage mechanism.

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Section: As-cast Microstructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Sr addition on microstructures and mechanical properties of Mg-1Zn-1Ca-xSr alloys

Geng-Yi

Guo

Teng

et al. 2020

Mater. Res. Express

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“…The Mg2.5%Zn alloy obtained the obvious enhancement of mechanical properties ascribed to the following three aspects. 27) However, the highdeveloped dendrite structure and annular MgZn intermetallic phases with higher hardness leaded to the serious spatial heterogeneity of properties of Mg25%Zn and Mg50%Zn alloys. And the crack sources could be easily developed at the interface of the intermediate phases and the alloy matrix, which cause a sharp drop on their mechanical properties.…”

Section: Mechanical Properties and Porositiesmentioning

confidence: 99%

Effects of the Intermetallic Phases on Microstructure and Properties of Biodegradable Magnesium Matrix and Zinc Matrix Prepared by Powder Metallurgy

et al. 2018

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A series of MgZn alloys, including Mg1%Zn, Mg2.5%Zn, Mg25%Zn, Mg50%Zn, Mg75%Zn and Mg99%Zn alloys (at%), were designed and produced by powder metallurgy for bone tissue engineering. The effects of MgZn intermetallic phases on microstructures, mechanical properties and corrosion resistance of Mg matrix and Zn matrix were studied and compared to select the suitable candidates for biodegradable metallic implants. The results showed that Mg2.5%Zn alloy could be treated as good candidate for bone tissue engineering due to its suitable mechanical properties, relatively low degradation rate and good biosafety. Mg1%Zn alloy could be used as candidate for implants without high strength requirements. The typical dendrite structure between bulk intermetallic phases and matrix were found in Mg25%Zn and Mg50%Zn alloys, which caused obvious property heterogeneity, strength reduction, and severe galvanic corrosion. Mg75%Zn and Mg99%Zn alloys obtained the lower degradation rates and higher compressive strengths, but they were too brittle to be used as available biomaterials. Consequently, the MgZn series alloys prepared by powder metallurgy have the potential to serve as biodegradable metals.

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“…Since the alloy is designed to be implanted in the human body, like bone screw, the biological safety is greatly important for designing consideration, which means to select bio-functional elements with non-toxicity and degradation. In previous works, researchers [16][17][18][19][20] found that the addition of some biological functional elements such as Ca, Sr, Zn and Ag could benefit by not only refining alloy grain size, but also playing the role of solid solution strengthening, age hardening and sterilization. Du et al [21] reported that the addition of the alloying element Ca inhibited dynamic recrystallization and grain growth and promoted dynamic precipitation during the extrusion process, which raised the yield strength of Mg-6Zn from 125 MPa to 230 MPa.…”

Section: Introductionmentioning

confidence: 99%

“…Du et al [21] reported that the addition of the alloying element Ca inhibited dynamic recrystallization and grain growth and promoted dynamic precipitation during the extrusion process, which raised the yield strength of Mg-6Zn from 125 MPa to 230 MPa. Cheng et al [19] found that Sr could effectively refine grain and produce more intermetallic compounds, and Mg-5Zn alloy with 0.2%Sr content comprehensively performed very well. Huang et al [22][23][24] studied the effect of Ag, Zn and Ca on the microstructure and aging behavior of Mg-Sn alloys from different aspects and found that the addition of alloying elements could greatly increase the hardness of the Mg-Sn alloy and enhance the age hardening effect.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties and Corrosion Resistance of Magnesium Alloys with Different Alloying Elements for Bone Repair

et al. 2018

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In order to make a rational design of magnesium alloys for bone repair, four kinds of Mg alloy ingots were prepared by vacuum induction furnace, namely Mg-3Zn-0.2Ca (wt.%) (ZX30), Mg-3Zn-0.8Zr (wt.%) (ZK30), Mg-3Zn-0.8Zr-0.3Sr (wt.%) (ZKJ300) and Mg-3Zn-0.8Zr-0.3Ca-0.3Ag (wt.%) (ZKXQ3000) alloys. The four ingots were extruded into bar materials through a hot-extrusion process under different temperatures with different extrusion ratios, the mechanical performances and the corrosion behaviors in the simulated body fluid (SBF) of the four alloys were investigated, and the mechanism of fracture and corrosion was characterized by scanning electron microscopy (SEM). The results showed the ultimate compressive strength (UCS) of all the alloys were found to be around 360 MPa, while ultimate tensile strengths (UTS) of ZKJ300 (334.61 ± 2.92 MPa) and ZKXQ3000 (337.56 ± 2.19 MPa) alloys were much higher than those of ZX30 (298.17 ± 0.93 MPa) and ZK30 (293.26 ± 2.71 MPa) alloys. The electrochemical noise and immersion tests in the SBF indicated that ZK30 alloy performed better in corrosion resistance.

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Effects of minor Sr addition on microstructure, mechanical and bio-corrosion properties of the Mg-5Zn based alloy system

Cited by 78 publications

References 22 publications

Effects of Sr addition on microstructures and mechanical properties of Mg-1Zn-1Ca-xSr alloys

Effects of Sr addition on microstructures and mechanical properties of Mg-1Zn-1Ca-xSr alloys

Effects of the Intermetallic Phases on Microstructure and Properties of Biodegradable Magnesium Matrix and Zinc Matrix Prepared by Powder Metallurgy

The Mechanical Properties and Corrosion Resistance of Magnesium Alloys with Different Alloying Elements for Bone Repair

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