Rare Earth Element Yttrium Modified Mg-Al-Zn Alloy: Microstructure, Degradation Properties and Hardness

Liu, Long; Yuan, Fulai; Zhao, Ming-Chun; Gao, Chengde; Feng, Pei; Yang, Youwen; Yang, Sheng

doi:10.3390/ma10050477

Cited by 42 publications

(25 citation statements)

References 36 publications

(40 reference statements)

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“…Ag exhibit favorable biocompatibility and highly antimicrobial, and also has nontoxic to human body at low concentration . These findings are consistent with other studies that the alloys containing Mg, Ag, and Y have a good biocompatibility …”

Section: Discussionsupporting

confidence: 92%

In vitro and in vivo evaluation of novel biodegradable Mg‐Ag‐Y alloys for use as resorbable bone fixation implant

Dai

Luo

et al. 2018

J Biomedical Materials Res

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Magnesium (Mg) alloy is gaining more interest because of its degradability and osteogenic potential. Still, it has some deficiencies, such as its rapid degradation rate, insufficient mechanical property. This research aimed to design a novel biodegradable Mg-argentum (Ag)-yttrium (Y) alloy, and Y was added to improve degradable and mechanical property. Mg-Ag-Y alloys were characterized for mechanical features, practicabilities in vitro and in vivo. The mechanical features results shown that this novel component was similar to native bone tissue in elastic moduli, tensile, and compressive stress. Then mesenchymal stem cells (MSCs) were seeded in alloys to assess cell toxicity in vitro. The results showed that its aqueous extract was suitable for MSCs adhesion and proliferation. Then the alloy was evaluated for biomedical applications in nonfractured distal femora of Sprague Dawley rats for 6 weeks, compared with those of pure-Mg and stainless steel groups. All rats survived, and hematological and histological evaluation showed no abnormal physiology 6 weeks postimplantation, and measurements of serum Mg concentration were within normal levels. X-ray scanning, microcomputed tomography, and histological examinations were performed to evaluate the degradability and osteogenic potential. The results indicated that the degradation rate of alloy was 0.91 mm per year, (range 0.77-1.22 mm), and pure-Mg 1.80 mm per year (1.43-2.26 mm). The new bone quantity was 3.18 mm (1.46-4.44 mm ) in Mg-Ag-Y alloys group, 1.39 mm (0.54-2.32 mm ) in pure-Mg group, and none in stainless steel group. These promising results suggest potential clinical application of Mg-Ag-Y alloys for use as resorbable bone fixation implant. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2059-2069, 2018.

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Section: Discussionsupporting

confidence: 92%

In vitro and in vivo evaluation of novel biodegradable Mg‐Ag‐Y alloys for use as resorbable bone fixation implant

Dai

Luo

et al. 2018

J Biomedical Materials Res

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“…According to the recent researches [23,40], the mechanical properties of alloy is related with the microstructue greatly. The matrix with fine microstructure and well distributed strengthening phase would increase the strength and ductility simultaneously.…”

Section: Resultsmentioning

confidence: 99%

“…And moreover the precipitation by the aging treatment improved the strength of the alloy further. The recent investigations [23,24] on the Y and Nd modified Mg based alloy exhibited that the formation of intermetallic phase was beneficial to the corrosion resistance and strength. Though the addition of Y and Nd could increase the strength of the Mg alloy, however their low solid solubility in Mg matrix promoted them to segregate along the grain boundary during solidification, which was detrimental to the ductility.…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

Sheng

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In the present paper, the Mg-Zn-Y-Nd alloy was prepared by casting, heat treatment and hot extrusion. The microstructure and mechanical properties of the alloys were tested by OM, SEM, TEM and tensile test. The results showed that the Mg 3 Zn 2 Y 3 phase is the main strengthening phase and forms the eutectic structure with α-Mg matrix in the as cast alloy. The strengthening phases semi-continuously connect and separate the α-Mg matrix into cell structure. The average grain size of the as cast alloy is about 60 μm. The heat treatment promotes the solid solution of the strengthening phase and precipitation of small particles inside grain.Compared with the as cast alloy, the heat treatment increases grain size a little and mechanical properties more than 30%. The hot extrusion refines the grain and strengthening phase, which increase the mechanical properties significantly. Moreover, the great deformation by the hot extrusion results in the ultrafine structure and abundant of crystal defects. The intersection of micro-twins lead to the special region with nanometer size. IntroductionMagnesium (Mg) alloys have attracted great attention as the light weight structural materials owing to their high specific strength, low density, ease of recycling and good damping, which can be applied in many fields, including implants, hand tools, sports equipment, automobiles, aerospace applications and electronic equipment [1][2][3][4]. Moreover, the recent research exhibited that the clinic trial of coronary stent made by rare earth doped Mg alloy exhibited good therapeutic effect without thrombosis, which demonstrated the good application prospect of Mg based implant [5]. However, the hexagonal closepacked (HCP) crystal structure of Mg limited the number of initiation slip systems during deformation at relative low temperature, which resulted in the poor deformability of Mg alloy [6]. The poor ductility and low strength of Mg alloy handicapped its wide application. To conquer these shortcomings of Mg alloy, many methods had been applied [7][8][9]. Alloying and thermal processing had been thought as the efficient method to improve the mechanical properties of Mg alloy at room and high temperature.Recently, the investigations [10-12] on biomedical magnesium alloys revealed that the addition of Zn could improve its mechanical properties and corrosion resistance with little influence on its biocompatibility, because the Zn is the essential element of the human body. Then a series of new magnesium alloys for biomedical application were developed [13][14][15]. The research of Zhang et al. [10] exhibited that Zn addition in Mg could increases the mechanical performance and biocompatibility, and the Mg-6Zn (wt.%) alloy was the best choice. But the mechanical properties of Mg-Zn alloy is not

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“…Therefore, in recent years, friction and wear of magnesium alloys have gradually become a hot topic in the tribology field. Researchers have found that friction and wear of magnesium and magnesium alloys can be significantly improved by adding rare-earth elements [10,11,12,13,14]. Hidetoshi et al [12] studied the wear of squeezed AZ91 magnesium alloy containing Y and found that a small amount of Al 2 Y phase improved the hardness and thermal stability of the alloy, thus increasing the friction and wear resistances of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

et al. 2018

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In this study, the effects of cerium (Ce) addition on the friction and wear properties of surface welding AZ91 magnesium alloys were evaluated by pin-on-disk dry sliding friction and wear tests at normal temperature. The results show that both the friction coefficient and wear rate of surfacing magnesium alloys decreased with the decrease in load and increase in sliding speed. The surfacing AZ91 alloy with 1.5% Ce had the lowest friction coefficient and wear rate. The alloy without Ce had the worst wear resistance, mainly because it contained a lot of irregularly shaped and coarse β-Mg17Al12 phases. During friction, the β phase readily caused stress concentration and thus formed cracks at the interface between β phase and α-Mg matrix. The addition of Ce reduced the size and amount of Mg17Al12, while generating Al4Ce phase with a higher thermal stability. The Al-Ce phase could hinder the grain-boundary sliding and migration and reduced the degree of plastic deformation of subsurface metal. Scanning electron microscopy observation showed that the surfacing AZ91 alloy with 1.5% Ce had a total of four types of wear mechanism: abrasion, oxidation, and severe plastic deformation were the primary mechanisms; delamination was the secondary mechanism.

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Rare Earth Element Yttrium Modified Mg-Al-Zn Alloy: Microstructure, Degradation Properties and Hardness

Cited by 42 publications

References 36 publications

In vitro and in vivo evaluation of novel biodegradable Mg‐Ag‐Y alloys for use as resorbable bone fixation implant

In vitro and in vivo evaluation of novel biodegradable Mg‐Ag‐Y alloys for use as resorbable bone fixation implant

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

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