Optimisation of the mechanical properties of a Spark Plasma Sintered (SPS) magnesium alloy through a post-sintering in-situ precipitation treatment

Mondet, Mathieu; Barraud, Elodie; Lemonnier, Sébastien; Allain-Bonasso, Nathalie; Grosdidier, Thierry

doi:10.1016/j.jallcom.2016.12.066

Cited by 32 publications

(7 citation statements)

References 26 publications

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“…The work of Chua et al [22] and Mahathaninwong et al [23] indicated that the similar heat treatment route had various effects on the mechanical properties of SPS and rheocasting 7075 alloys. Mondet et al [24] found that for the SPS-fabricated AZ91 alloy, the in-situ precipitation treatment is more preferred than the traditional T6 heat treatment because it led to a more significant improvement of the mechanical properties. Therefore, the heat treatment regime of the SPS-fabricated alloys needs to be optimized because of their special microstructures.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Yan

Wang

et al. 2019

Materials

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The present study aimed to optimize the phase constituents and mechanical properties of the spark plasma sintered (SPS) Inconel 718 (IN718) alloy. A series of heat treatment routes were designed based on the phase relations in IN718 and performed for the optimization. The microstructure and phase compositions of the SPS IN718 alloys were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and transmission electron microscopy (TEM). The mechanical properties of the samples were characterized at room temperature and at 650 °C. The results showed that large amounts of γ” (Ni3Nb) and γ’ (Ni3(Al, Ti)) strengthening phases precipitated in the IN718 alloy after direct aging (DA) of the as-fabricated sample. Moreover, the mechanical properties of the DA sample were comparable to that of the best one of the solution-treated and aged counterparts. The analysis showed that the rapid sintering and solid solution treatment of the IN718 alloy were achieved simultaneously by SPS. In the case of the SPS IN718 material, the direct aging regime had the same heat treatment effect as the conventional solid solution and aging treatment. This contributes toward improving the production efficiency and reduces manufacturing costs in the actual production process.

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Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Yan

Wang

et al. 2019

Materials

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“…Furthermore, the improvement of interparticle bonding can delay failure, which leads to higher strain and UCS. [ 40 ] Therefore, the reduction in the content of MgO will further improve the mechanical properties. Further investigations on the broken oxide film and consolidation process (such as ball milling, [ 38 ] plastic deformation, [ 39 ] etc.)…”

Section: Discussionmentioning

confidence: 99%

Effect of Sintering Temperature on Microstructure and Mechanical Properties of AZ91 Magnesium Alloy via Spark Plasma Sintering

et al. 2021

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AZ91 alloy is the commonly used magnesium alloy due to its castability and high specific strength. [1,2] However, the cast AZ91 alloy shows low absolute strength and poor ductility due to large grain size, coarse precipitates, and close-packed hexagonal (HCP) structure, which greatly hinder its application. [2][3][4] Grain refinement is one effective way to improve the mechanical properties of Mg alloys. Plastic deformation technology is an important approach for grain refinement of magnesium alloys. It is well accepted that the strong basal texture forms in plastic deformation processing. However, when compressed along the rolling direction or extrusion direction, the {1012} tension twinning is activated, resulting in a relatively low compressive yield strength (CYS). [5] Thus, tension twin suppression is an important issue for improving compressive properties of Mg alloys. Grain refinement and texture weakening are two effective strategies for tension twin suppression. As an innovative processing technology, spark plasma sintering (SPS) combines high uniaxial pressure with pulsing direct electric current to heat the powder, which achieves the densification of sintered samples in a short time and forms a finer microstructure without texture. [6][7][8] Furthermore, SPS technology has been used to fabricate fine-grain Mg alloys with high compressive strength compared with the cast Mg alloys. [9][10][11] Recent researches showed that the mechanical properties of magnesium alloy are determined by the grain size, amount of precipitates, and solute content, which are greatly related to the sintering temperature. [10][11][12] The grain refinement, precipitation, and solid solution strengthening mechanisms have been developed to explain the impact of microstructure on the mechanical properties of the SPS-sintered magnesium alloys. [10] In addition, the dislocation strengthening mechanism plays an important role in metals with high density of dislocations. [13][14][15] It should be noticed that the gas-atomized powder contains a high degree of dislocations. [16] However, there is little report on the evolution of dislocations density at different sintering temperatures for SPS Mg alloys. Consequently, the effect of dislocation strengthening on the mechanical properties of the SPS-sintered magnesium alloys is yet not clear.In this work, gas-atomized powder was used to prepare AZ91 alloys by SPS. This study aims to quantitatively investigate the effect of the SPS sintering temperature on the microstructure (the amount and distribution of precipitates, the dislocation density, and the grain size) and the mechanical properties of the

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“…Spark Plasma Sintering (SPS) allows fast consolidation of powder materials. This method effectively consolidates powders in short times due to rapid heating while a compressive load is applied [8][9][10]. The spark plasma sintering combines electrical energy with unidirectional mechanical pressure to convert powders into compacted material of the required dimensions and density.…”

Section: Introductionmentioning

confidence: 99%

evolution of microstructure of magnesium materials prepared by SPS using various compacting pressures

Brescher¹,

Hasoňová²,

Březina³

et al. 2022

METAL 2022 Conference Proeedings

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Compacting pressure applied during the SPS method varies in the literature. This study evaluates the influence of the applied compacting pressure on the microstructure and porosity of sintered materials. Using spark plasma sintering (SPS), cold compacted magnesium powder (green compacts) was sintered to bulk magnesium materials. The green magnesium compacts were prepared at room temperature using 100 MPa of uniaxial pressure, which was applied for 60 s. Using SPS, the green compacts sintering was carried out at 400 °C for 10 min. Various compacting pressures were applied during sintering: 20, 40, 60, 80 and 100 MPa to analyse the influence of the pressure. The resulting microstructure and porosity strongly depended on the compacting pressure applied during SPS. An increase of the compacting pressure was shown to be beneficial for material homogeneity, while this effect was pronounced up to 60 MPa, and only a slight effect on the material porosity was observed above this pressure.

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Optimisation of the mechanical properties of a Spark Plasma Sintered (SPS) magnesium alloy through a post-sintering in-situ precipitation treatment

Cited by 32 publications

References 26 publications

Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Effect of Sintering Temperature on Microstructure and Mechanical Properties of AZ91 Magnesium Alloy via Spark Plasma Sintering

evolution of microstructure of magnesium materials prepared by SPS using various compacting pressures

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