Nd-induced honeycomb structure of intermetallic phase enhances the corrosion resistance of Mg alloys for bone implants

Shuai, Cijun; Yang, Youwen; Peng, Shuping; Gao, Chengde; Feng, Pei; Chen, Jian; Liu, Yong; Lin, Xin; Yang, Sheng; Yuan, Fulai

doi:10.1007/s10856-017-5945-0

Cited by 28 publications

(14 citation statements)

References 34 publications

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“…This is mainly because of the increase in the second phase, and in particular, the formation of a network structure. The second phase with a network structure may be conducive to crack formation, and thus reduce the mechanical properties of the alloys …”

Section: Discussionmentioning

confidence: 99%

“…The second phase with a network structure may be conducive to crack formation, and thus reduce the mechanical properties of the alloys. [32] Mg has a hexagonal close-packed crystal structure; under the action of tension at room temperature, slip mainly occurs along the {0001} basal slip plane and along the f1012g plane for twinning because of its limited foundation slip system. [33] During twinning deformation, stress release could result in crack formation ( Figure 6a).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…When the specimen was subjected to stress, the noncoherent relationship at the interface provides space for the formation of vacancies, and the crack source finally formed. In addition, because of the difference in the slip surface orientation of the second phase compared with the matrix, motion of the dislocation at the interface was blocked; the dislocation was entangled, and dislocation groups formed in the end, as shown in Figure 12b,d-f. [32] Because the large second phase is generally hard and brittle, [31] it may cause stress concentration and promote crack formation between the matrix and the second phase when subjected to load. [36] Eventually, this leads to the fracture of the investigated alloys.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

Wen

et al. 2020

Adv Eng Mater

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As candidates for biomaterials, magnesium and its alloys have promising properties such as biodegradability and biocompatibility. However, their poor mechanical properties and rapid degradation rate limit clinical application; therefore, solving these issues is essential for practical application. Herein, different contents of dysprosium (Dy) (0, 0.5, 1, 1.5, 2, 3 mass%) are added to the Mg–2Zn–0.5Zr biomagnesium alloy to explore its effect on the mechanical and degradation properties. Assessments are conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), immersion, and electrode chemical experiments. The results indicate that the addition of Dy significantly decreases the grain size, and the second phase is (Mg, Dy)7Zn3 with a body‐centered cubic structure. At a Dy content of 1.5 mass%, grain refinement and second‐phase strengthening result in the alloy having relatively good properties, with an ultimate tensile strength (UTS) = 150 ± 14 MPa, yield strength (YS) = 89 ± 3 MPa, and elongation (EL) = 9.2 ± 0.6%. The addition of Dy promotes the formation of a stable protective film and increases the electrode potential of the Mg matrix, resulting in a degradation rate of 0.89 ± 0.12 mm year−1. The results indicate that the alloy with 1.5 mass% Dy content is a promising candidate for using as a biodegradable material.

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Section: Discussionmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

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Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

Wen

et al. 2020

Adv Eng Mater

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“…Nevertheless, in ZK60-3.6Nd, the honeycomb intermetallic phase restrains the propagation of corrosion. [17] Thus, whether corrosion of magnesium alloys is retarded or accelerated is highly influenced by the distribution of intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

Zhang

Huang

Feyerabend

et al. 2020

Metall Mater Trans A

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The influence of intermetallic microstructure on the degradation of Mg-5Nd alloy with different heat treatments was investigated via immersion testing in DMEM + 10 pct FBS under cell culture conditions and subsequent microstructural characterizations. It was found that T4 heat-treated sample had the poorest corrosion resistance due to the lack of finely dispersed precipitates inside grains, continuous lamellar particles along grain boundaries and outer Ca-P layer, and to the formation of a loose corrosion product layer. In contrast, the aged samples exhibited a better corrosion resistance due to their presence and to the formation of a compact corrosion layer. Their degradation behavior largely depended on the intermetallic microstructure. Corrosion was initiated in the matrix around stable globular particles Mg41Nd5 at grain boundaries. In the sample aged at high temperature 245 °C, the coexistence of lamellar Mg41Nd5 particles and their nearby Nd-poor regions enhanced the corrosion. The corrosion first started in such regions. It was shown that those finely dispersed precipitates formed during aging had no influence on the corrosion initiation. However, they indeed affected the subsequent corrosion propagation with the immersion proceeding. They supplied barriers for corrosion propagation and hence were beneficial for improving the corrosion resistance. The continuously distributed lamellar Mg41Nd5 precipitates formed at grain boundaries during aging at 245 °C supplied an additional effective obstacle to corrosion propagation. This was especially beneficial for hindering the corrosion propagation at the later stage of corrosion.

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“…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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Nd-induced honeycomb structure of intermetallic phase enhances the corrosion resistance of Mg alloys for bone implants

Cited by 28 publications

References 34 publications

Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

Effects of Dy Addition on the Mechanical and Degradation Properties of Mg–2Zn–0.5Zr Alloy

Effects of Intermetallic Microstructure on Degradation of Mg-5Nd Alloy

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

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