Influence of sintering routes to the mechanical properties of magnesium alloy and its composites produced by PM technique

Xie, Wan-Zhen; Liu, Yue; Li, De Song; Zhang, Jian; Zhang, Zhen Wei; Bi, Jing

doi:10.1016/j.jallcom.2006.05.076

Cited by 23 publications

(8 citation statements)

References 21 publications

(18 reference statements)

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“…Previous research involving magnesium powder has mainly used P/M as a means to produce difficult-to-form alloys. These alloys include metal matrix composites (MMC), 9–11 where P/M can alleviate some of the matrix/reinforcement interface issues when the matrix metal is in the molten state. The P/M method also allows a highly homogeneous mixture of the reinforcement particles within the matrix, resulting in consistent mechanical properties in all directions.…”

Section: Magnesium Powder Metallurgymentioning

confidence: 99%

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

2012

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Magnesium (Mg) and its alloys are attractive for use in automotive and aerospace applications because of their low density and good mechanical properties. However, difficulty in forming magnesium and the limited number of available commercial alloys limit their use. Powder metallurgy may be a suitable solution for forming near-net-shape parts. However, sintering pure magnesium presents difficulties due to surface film that forms on the magnesium powder particles. The present work investigates the composition of the surface film that forms on the surface of pure magnesium powders exposed to atmospheric conditions and on pure magnesium powders after compaction under uniaxial pressing at a pressure of 500 MPa and sintering under argon at 600 °C for 40 minutes. Initially, focused ion beam microscopy was utilized to determine the thickness of the surface layer of the magnesium powder and found it to be ∼10 nm. The X-ray photoelectron analysis of the green magnesium sample prior to sintering confirmed the presence of MgO, MgCO3·3H2O, and Mg(OH)2 in the surface layer of the powder with a core of pure magnesium. The outer portion of the surface layer was found to contain MgCO3·3H2O and Mg(OH)2, while the inner portion of the layer is primarily MgO. After sintering, the MgCO3·3H2O was found to be almost completely absent, and the amount of Mg(OH)2 was also decreased significantly. This is postulated to occur by decomposition of the compounds to MgO and gases during the high temperature of sintering. An increase in the MgO content after sintering supports this theory.

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Section: Magnesium Powder Metallurgymentioning

confidence: 99%

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

2012

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“…With the increase of zinc content, this kind of tiny pores with different diffusion rates are increasing, and the micropores lead to a sharp decrease in the mechanical properties of the material. Another reason may be that there is a thin oxide layer between the surface of the powder particles that affects the bonding between the powders, with the increase of zinc content, this oxide layer in contact with the magnesiumparticle surface area increases subsequently, in recent decades, it has been shown that the oxide layer on the surface of magnesium-alloy powder plays a role in preventing diffusion during the sintering process, thus making the bonding between the powders insufficient, leading to a decrease in the mechanical properties of the material [19][20][21].…”

Section: Microhardness and Bending Forcementioning

confidence: 99%

Preparation of medical Mg–Zn alloys and the effect of different zinc contents on the alloy

Guo

Qiao

et al. 2022

J Mater Sci: Mater Med

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In recent years, along with the development and application of magnesium alloys, magnesium alloys have been widely used in automotive, aerospace, medicine, sports, and other fields. In the field of medical materials, magnesium not only has the advantage of light weight, high strength, and a density similar to that of human bone, but also has good biocompatibility and promotes the growth of human bone. However, the mechanical properties and corrosion resistance of magnesium alloys need to be further improved to meet the requirements for human biodegradable implants. In this study, three alloys (mass fractions: Mg–10Zn, Mg–20Zn, and Mg–30Zn (wt.%)) were prepared using powder metallurgy by homogeneously mixing powders of the above materials in a certain amount with magnesium as the substrate through the addition of zinc elements, which also have good biocompatibility. The effect of zinc on the microstructure, mechanical properties, wear performance, and corrosion resistance of magnesium–zinc alloys was studied when the zinc content was different. The results show that compared with the traditional magnesium alloy using powder metallurgy, prepared magnesium alloy has good resistance to compression and bending, its maximum compressive stress can reach up to 318.96 MPa, the maximum bending strength reached 189.41 MPa, and can meet the mechanical properties of the alloy as a human bone-plate requirements. On the polarization curve, the maximum positive shift of corrosion potential of the specimens was 73 mv and the maximum decrease of corrosion-current density was 53.2%. From the comparison of the above properties, it was concluded that the three prepared alloys of which Mg–20% Zn had the best overall performance. Its maximum compressive stress, maximum bending strength, and corrosion-current density reached 318.96 MPa, 189.41 MPa and 2.08 × 10−5 A·cm−2 respectively, which are more suitable for use as human implant bone splints in human-body fluid environment.

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“…Peak 2 occurs at y420uC and is due to the formation of a liquid phase; however, such a phase was shown to flow out of the specimen because of the applied pressure, and as a result of this, it could not help sintering in promoting liquid phase sintering. 14,15 The XRD analysis of the materials showed that the b phase content in A400 was 22?1%, whereas the content in A450 was only 7?1% (the content of Mg 2 Si was y4% in both cases). This is a further confirmation that a liquid phase, rich in Al, formed during sintering at 450uC and that no liquid phase formed during sintering at 400uC.…”

Section: Microstructure and Hardness Of Sps Alloysmentioning

confidence: 99%

“…The experimental values are quite similar to that displayed by wrought or cast Mg alloys. 4,15 No differences can be appreciated between the three materials, although they are characterised by different room temperature hardnesses due to different contents of the b phase and different matrix microhardnesses (Table 1). This result can be explained by considering that, above 225uC, plastic deformation is due to creep by dislocation motion with a large amount of slip systems being operative.…”

Section: Hot Compression Behaviourmentioning

confidence: 99%

Spark plasma sintering and hot compression behaviour of AZ91 Mg alloy

Straffelini

Nogueira

Muterlle

et al. 2011

Materials Science and Technology

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In the present investigation, the microstructural characterisation of the AZ91 Mg alloy produced by spark plasma sintering (SPS), as well as the evaluation of its hot compression behaviour, has been performed. Based on the differential scanning calorimetry analyses of the starting powders, three SPS cycles are investigated, using temperatures of 400 and 450°C, and at 450°C with previous solubilisation soaking at 420°C. Despite different microstructural and hardness characteristics, the three alloys display similar hot compression behaviour. At 200°C, the formation of an unstable crack, which propagates at 45° with respect to the loading axis, is observed after the occurrence of the peak load. At higher testing temperatures, after reaching the peak stress, the flow stress decreases slowly with increased strain of ∼0·51. Such behaviour corresponds with the observation of an accelerated cracking due to the propagation of decohesions at the interparticle regions. Ultimately, SPS allowed for attainment of high relative density; however, the sintering degree of the materials was quite low.

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Influence of sintering routes to the mechanical properties of magnesium alloy and its composites produced by PM technique

Cited by 23 publications

References 21 publications

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

Preparation of medical Mg–Zn alloys and the effect of different zinc contents on the alloy

Spark plasma sintering and hot compression behaviour of AZ91 Mg alloy

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