The Effect of Rod-Shaped Long-Period Stacking Ordered Phases Evolution on Corrosion Behavior of Mg95.33Zn2Y2.67 Alloy

Wang, Jingfeng; Jiang, Weiyan; Guo, Shuyu; Li, Yang; Ma, Yanwei

doi:10.3390/ma11050815

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…For the Zn-containing alloys, the LPSO structures are formed during solid solution treatment and the volume fraction of LPSO structures increases with Zn content. The strengthening effect of LPSO structures is sensitively dependent on size and morphology [36][37][38], while the size of LPSO phases in cast Mg-RE-Zn alloys is generally too large to effectively strengthen the alloys [6]. However, LPSO structures can improve the ductility by increasing the critical resolved shear stress (CRSS) of basal plane and promote the activation of nonbasal plane slip [39,40].…”

Section: Effect Of Zn Content On As-quenched Microstructures and Mechanical Propertiesmentioning

confidence: 99%

Effect of Zn Addition on the Microstructure and Mechanical Properties of Cast Mg–10Gd–3.5Er–xZn–0.5Zr Alloys

Zhang

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this work, the effects of Zn content (0-2 wt%) on microstructural evolution and mechanical properties of cast Mg-10Gd-3.5Er-0.5Zr alloys are studied. The results show that the as-cast Mg-10Gd-3.5Er-xZn-0.5Zr alloys are mainly composed of Mg matrix and secondary (Mg, Zn) 3 (Gd, Er) phases distributed along grain boundaries. With the increase in Zn content, the volume fraction of secondary (Mg, Zn) 3 (Gd, Er) phases increases and the grains get refined. In the process of solid solution treatment, Zn addition can lead to the formation of long-period stacking ordered (LPSO) structures and the volume fraction of LPSO structures increases with Zn content. In addition, the Zn addition can reduce the vacancy formation energy and accelerate the diffusion rate of RE elements in Mg matrix. Because of the comprehensive effect of secondary phases and the accelerated diffusion rate, the base alloy and 2Zn alloy have less grain growth after solid solution treatment than that of the 0.5Zn alloy and 1Zn alloy. The precipitation process is also accelerated by enhanced diffusion rate. At room temperature (RT), the strengthening effect of βʹ + β 1 precipitates is more effective than that of LPSO structures, so the peak-aged 0.5Zn alloy exhibits the most excellent mechanical performance at RT, with yield strength of 219 MPa, ultimate tensile strength 296 MPa and elongation of 6.4%. While LPSO structures have stronger strengthening effect at elevated temperature than that of βʹ + β 1 precipitates, so the 1Zn alloy and 2Zn alloy have more stable mechanical performance than that of the base alloy and 0.5Zn alloy with the increase in tensile temperature.

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Section: Effect Of Zn Content On As-quenched Microstructures and Mechanical Propertiesmentioning

confidence: 99%

Effect of Zn Addition on the Microstructure and Mechanical Properties of Cast Mg–10Gd–3.5Er–xZn–0.5Zr Alloys

Zhang

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…Research on Mg-RE alloys covers many aspects: strength and ductility [1], creep [2], fatigue [3], corrosion [4,5], and their biological performance as biodegradable implants [6,7]. However, there are only a few studies on the fracture mechanics, toughness and the influence of the microstructure on the crack propagation, especially in Mg-RE alloys containing Zn and therefore consisting of long-period stacking-ordered (LPSO) structures.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation in As-Extruded and Heat-Treated Mg-Dy-Nd-Zn-Zr Alloy Explained by the Effect of LPSO Structures and Their Micro- and Nanohardness

et al. 2021

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The investigation of the crack propagation in as-extruded and heat-treated Mg-Dy-Nd-Zn-Zr alloy with a focus on the interaction of long-period stacking-ordered (LPSO) structures is the aim of this study. Solution heat treatment on a hot extruded Mg-Dy-Nd-Zn-Zr (RESOLOY®) was done to change the initial fine-grained microstructure, consisting of grain boundary blocky LPSO and lamellar LPSO structures within the matrix, into coarser grains of less lamellar and blocky LPSO phases. C-ring compression tests in Ringer solution were used to cause a fracture. Crack initiation and propagation is influenced by twin boundaries and LPSO lamellae. The blocky LPSO phases also clearly hinder crack growth, by increasing the energy to pass either through the phase or along its interface. The microstructural features were characterized by micro- and nanohardness as well as the amount and location of LPSO phases in dependence on the heat treatment condition. By applying nanoindentation, blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases and their hardness decreases with heat treatment time. On the other hand, the matrix increases in hardness by solid solution strengthening. The microstructure consisting of a good balance of grain size, matrix and blocky LPSO phases and twins shows the highest fracture energy.

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“…Elemental alloying is a powder metallurgical process, in which metallic powder particles are mechanically alloyed and subsequently sintered by appropriate techniques. In the past, alloying of safe elements, such as zinc (Zn), aluminium (Al), silver (Ag), yttrium (Y), zirconium (Zr), neodymium (Nd), silicon (Si), manganese (Mn), titanium dioxide (TiO 2 ), and calcium (Ca), were selected in response to increase the corrosion resistance and biological function of Mg [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Although the element Al in Mg composites improves mechanical properties, released Al + ions cause Alzheimer’s disease and muscle fiber damage [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Corrosion Resistance and In-Vitro Bioactivity Behavior of Biodegradable Mg–Zn–Mn–(Si–HA) Composite for Orthopaedic Applications

et al. 2018

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Recently, magnesium (Mg) has gained attention as a potential material for orthopedics devices, owing to the combination of its biodegradability and similar mechanical characteristics to those of bones. However, the rapid decay rate of Mg alloy is one of the critical barriers amongst its widespread applications that have provided numerous research scopes to the scientists. In this present, porous Mg-based biodegradable structures have been fabricated through the hybridization of elemental alloying and spark plasma sintering technology. As key alloying elements, the suitable proportions of silicon (Si) and hydroxyapatite (HA) are used to enhance the mechanical, chemical, and geometrical features. It has been found that the addition of HA and Si element results in higher degree of structural porosity with low elastic modulus and hardness of the Mg–Zn–Mn matrix, respectively. Further, addition of both HA and Si elements has refined the grain structure and improved the hardness of the as-fabricated structures. Moreover, the characterization results validate the formation of various biocompatible phases, which enhances the corrosion performance and biomechanical integrity. Moreover, the fabricated composites show an excellent bioactivity and offer a channel/interface to MG-63 cells for attachment, proliferation and differentiation. The overall results of the present study advocate the usefulness of developed structures for orthopedics applications.

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The Effect of Rod-Shaped Long-Period Stacking Ordered Phases Evolution on Corrosion Behavior of Mg95.33Zn2Y2.67 Alloy

Cited by 8 publications

References 28 publications

Effect of Zn Addition on the Microstructure and Mechanical Properties of Cast Mg–10Gd–3.5Er–xZn–0.5Zr Alloys

Effect of Zn Addition on the Microstructure and Mechanical Properties of Cast Mg–10Gd–3.5Er–xZn–0.5Zr Alloys

Crack Propagation in As-Extruded and Heat-Treated Mg-Dy-Nd-Zn-Zr Alloy Explained by the Effect of LPSO Structures and Their Micro- and Nanohardness

Synthesis, Characterization, Corrosion Resistance and In-Vitro Bioactivity Behavior of Biodegradable Mg–Zn–Mn–(Si–HA) Composite for Orthopaedic Applications

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