Microstructures and mechanical properties of AZ31 magnesium alloys fabricated via vacuum hot-press sintering

Yang, Lun; Wang, Tao; Liu, Chao; Ma, Yunzhu; Wu, Lei; Yan, Huanyuan; Zhao, Xinyue; Liu, Wensheng

doi:10.1016/j.jallcom.2021.159473

Cited by 34 publications

(10 citation statements)

References 24 publications

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“…In addition, it was found that the half width of the main diffraction peaks in α-Mg phase of the sintered alloys was narrower than that of the alloy powder. This phenomenon was also reported by Yang et al[9] in the AZ31 magnesium alloy sintered by hot press sintering technique, and was ascribed to the recrystallization and growth of dendritic grains inside the powder during the sintering process. Moreover, a weak diffraction pattern corresponding to the Mg 4 Zn 7 phase was observed in the XRD patterns of alloys sintered in a temperature range of 500 °C-600 °C.During the sintering process, it was found that a certain amount of melt formed on the edge of mold for the alloys sintered at 500, 550, and 600 °C.…”

supporting

confidence: 79%

“…The shape and resistivity differences of the alloy powder do not result in large local temperature differences during the sintering process. Thus, the performance deterioration could be reduced owing to the inhomogeneity of the microstructure [9]. Most of the research has focused on sintering method combined with thermal deformation processing of Mg alloys [10][11][12][13]; however, only a few reports have focused on the effect of the sintering process on the microstructures and properties of alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Jin

et al. 2022

Mater. Res. Express

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In this study, ZK60 Mg alloys were prepared via hot-press sintering under a constant pressure of 30 MPa as well as Ar atmosphere. The sintering temperature was determined to be in the range of 450–600 °C with an interval of 50 °C. The effect of sintering temperature on the microstructures and mechanical properties of the alloys was investigated. All the four sintered alloys mainly exhibited an α-Mg-phase structure and equiaxed grain microstructure. However, a specific amount of melt, enriched in Zn element, formed when the sintering temperature reached 500 °C. Thus, only the alloy sintered at 450 °C maintained the nominal composition of the alloy powder, and exhibited the favorable yield strength and hardness, which was 135.1 MPa and 57 HV, respectively. The alloys sintered at 550 °C and 600 °C exhibited a reduced yield strength and hardness due to the loss of Zn element.

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confidence: 79%

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Jin

et al. 2022

Mater. Res. Express

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“…As shown in figure 2, no obvious micropores were observed in both the sintered and extruded alloy, indicating a considerable density of the alloy. Figure 2(a1, a2) showed that the powder particle boundary (indicated by the blue arrows) in sintered alloy was continuous and thick, demonstrating an incomplete metallurgical bonding between the powder particle during sintering process [24]. Compared with the powder particle boundary, the grain boundary (indicated by the yellow arrows) in sintered alloy was apparently thinner.…”

Section: Resultsmentioning

confidence: 99%

Effect of extrusion temperature on the microstructure and mechanical properties of hot-extruded ZK60 magnesium alloy

Ma,

Chen

et al. 2023

Mater. Res. Express

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ZK60 magnesium alloy was prepared by the hot-pressed sintering combined with the hot-extruded technique. The microstructure and mechanical properties evolution of ZK60 alloy with a reduced extrusion temperature from 350 °C to 250 °C were investigated in detailed. The extruded alloy was mainly composed of fine α-Mg grains and MgZn2 phase. The grains size gradually decreased with a reduction in extrusion temperature, and the yield strength obviously increased accordingly. The alloy extruded at 250 °C exhibited the smallest average grain size of 2.5 μm and the best combination of strength and plasticity, with a yield strength of 279 MPa and fracture strain of 18.1% in compressive condition, and 263 MPa and 13.7% in tensile condition, as well as a tension-compression yield asymmetry of 0.94. Both the fine grains formed by the continuous and twin induced dynamic crystallization mechanism and the precipitation strengthening contributed to the strength improvement.

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“…Hot‐pressing sintering (HPS) is a cost‐effective thermomechanical process in which the sintering process is carried out by applying temperature and pressure simultaneously. [ 64 ] The HPS process can break the oxide films on the powder surfaces, thereby forming a good metallurgical bond between the powders during consolidation in the die. [ 65 ] Moreover, this process can enhance densification by reducing the porosity within the processed samples and result in a homogenous distribution of secondary phases, which may lead to enhanced mechanical and corrosion properties of the processed materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Degradation Behavior, and Cytocompatibility of Zn–Mg–Graphene Nanoplatelets Composite for Orthopedic‐Implant Applications

Kabir,

Lin,

Munir

et al. 2023

Adv Eng Mater

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Zinc (Zn)‐based materials reveal inadequate mechanical properties as orthopedic biodegradable implantable materials, which limits their biomedical applications. Herein, Zn–xMg (magnesium) composites (x = 0.5, 1.0, 1.5, and 2.0 wt%) reinforced with 0.2 wt% graphene nanoplatelets (GNP) are obtained via powder metallurgy and hot‐pressing sintering. The addition of 0.5–2.0 wt% Mg into Zn–0.2 wt% GNP composite resulted in the formation of Mg2Zn11 and MgZn2 phases without any additional intermetallic carbide phases. The hot‐pressing sintered (HPS) Zn–0.5Mg–0.2GNP composite exhibits a compressive yield strength of 169 ± 18 MPa, an ultimate compressive strength of 270 ± 39 MPa, a compressive strain of 17 ± 6%, and a microhardness of 86 ± 2 HV. Electrochemical corrosion testing reveals that corrosion resistance of HPS Zn–xMg–0.2GNP composites decreases with increasing Mg content, while immersion tests in Hanks’ balanced salt solution for 30 d indicate that the degradation rate increases from 0.032 to 0.141 mm y−1 by increasing Mg content from 0 to 2.0 wt%. In vitro cytotoxicity assessments using SaOS2 human osteoblast cells show >90% viability following exposure over 5 d to 12.5% extract concentrations of all HPS composites. The HPS Zn–0.5Mg–0.2GNP composite exhibits the appropriate material properties for biodegradable bone‐implant applications.

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Microstructures and mechanical properties of AZ31 magnesium alloys fabricated via vacuum hot-press sintering

Cited by 34 publications

References 24 publications

Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Effect of sintering temperature on microstructures and mechanical properties of ZK60 magnesium alloys

Effect of extrusion temperature on the microstructure and mechanical properties of hot-extruded ZK60 magnesium alloy

Mechanical Properties, Degradation Behavior, and Cytocompatibility of Zn–Mg–Graphene Nanoplatelets Composite for Orthopedic‐Implant Applications

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