Study on microstructure and mechanical properties of spark plasma sintered Alumix 431 powder

Garbiec, Dariusz; Siwak, Piotr

doi:10.1080/00325899.2016.1169362

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…Alumix 431 (ECKA Granules Germany GmbH, Velden, Germany) powder, without lubricant, exhibiting the chemical composition shown in Table 1, was spark plasma sintered using an HP D 25/3 furnace (FCT Systeme GmbH, Rauenstein, Germany), similar to the procedure described by the authors in [15]. The SPS parameters were chosen on the basis of the experimental results described in [5]. The powder was heated up to 500 • C at 100 • C/min in vacuum and held at the sintering temperature for 5 min.…”

Section: Methodsmentioning

confidence: 99%

“…Representative LM and SEM micrographs of the SPSed specimens are presented in Figure 1. The SEM micrograph of the unetched microstructure (Figure 1b) clearly shows Al grains of different sizes (dark contrast phase) with grain boundaries containing intermetallic phases (light contrast phase) similar to [3,5]. The microstructure is heterogeneous because of the simultaneous presence of very large and fine grains.…”

Section: Microstructurementioning

confidence: 99%

“…Powdered Al alloys, such as AA7075, demonstrate high stability of oxide films on the particle surface owing to the alloying elements, and it is difficult to effectively disrupt these films by SPS. Moreover, SPS of the AA7075-type alloyed powders led to the formation of a cellular microstructure with concentrated intercellular areas of the alloying elements [3,5], and neither SPS processing nor heat treatment could effectively disrupt this chemical segregation [3]. Thus, the tensile ductility of SPSed Al alloy compacts does not usually exceed 3-5%.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy

Garbiec¹,

Leshchynsky

García-Junceda

et al. 2021

Metals

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In this paper, the microstructure and mechanical properties of AA7075 with a coarse-fine-grained laminated microstructure produced by spark plasma sintering (SPS) and the cyclic extrusion severe deformation (KOBO) technique were investigated. It was found that an inhomogeneous grain microstructure was formed from coarse and fine grains by the SPS process and then was transformed into a coarse-fine-grained laminated microstructure by means of KOBO extrusion at room temperature. The grain refinement during KOBO extrusion resulted in a fine grained laminated microstructure created due to the formation of low-angle grain boundaries (LAGBs), followed by dynamic recrystallization, leading to high-angle grain boundaries (HAGBs). The EBSD analysis results reveal the formation of a deformed and partially recrystallized ultrafine grain microstructure owing to the generation and development of shear bands during KOBO extrusion. The ultimate tensile strength (UTS) of the AA7075 alloy rose after SPS-KOBO severe deformation up to 422 MPa, with high strains of about 33%. The obtained results clearly show that the SPS-KOBO extrusion technique allows a bimodal laminated fine gradient grain microstructure to be obtained due to deformation and dynamic recrystallization, which result in both high strength and good ductility. The new heterogeneous AA7075 alloys obtained by the SPS-KOBO combined techniques demonstrate that microstructural heterogeneities can assist in overcoming the strength–ductility trade-off.

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Section: Methodsmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy

Garbiec¹,

Leshchynsky

García-Junceda

et al. 2021

Metals

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“…This is accomplished by contributing to the rupture of the oxide layer at the surface of the pure aluminum powder, which has been demonstrated in previous studies [10][11][12][13][14][15][16][17]. However, it has been shown by Garbiec and Siwak [18] and Rudinsky et al [19] that Alumix 431 powder sintered by SPS exhibits low ductility during tensile or bending tests due to the lack of bonding between particles. It has been suggested that the formation of the spinel layer arising from the reaction of Mg and the alumina layer would impose the requirement for a higher applied load to break the oxide layer [20].…”

Section: Introductionmentioning

confidence: 85%

Spark plasma sintering and spark plasma upsetting of an Al-Zn-Mg-Cu alloy

Tünçay

Bishop

Brochu

2017

Materials Science and Engineering: A

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Al-Zn-Mg-Cu alloy powder Alumix 431D was sintered at 400°C by spark plasma sintering (SPS) and upset forging was applied to the sintered sample through SPS. Densities of 99.1 ± 0.3% and 99.8 ± 0.1% of theoretical were obtained for the sintered and forged samples, respectively. T6 temper was carried out on the samples and microstructure analysis and mechanical properties before and after heat treatment were evaluated. Microhardness of 173 ± 3 and 172 ± 3 HV were attained in the T6 temper of as-sintered and forged samples, respectively. The flexural strength and strain values were significantly improved after the forging process, which can be mainly attributed to the better particle bonding in addition to the occurrence of some recrystallization. Significant loss in the ductility was observed after the T6 temper.

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“…The studies have shown that incremental changes in SPS time generally enhances the densification of metals and alloys due to enhanced mass transfer [36], improved inter-particle bonding, reduced porosities [18], and enhanced heat flux [37], as depicted in Fig. 4, for Aluminum [35], and stainless steel 430L [19] as examples.…”

Section: Sps Timementioning

confidence: 99%

The densification behavior of metals and alloys during spark plasma sintering: A mini-review

Sovizi

Seraji

2019

Sci Sintering

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As of today, metals and alloys are widely utilized as structural, mechanical, electrical, and magnetic materials in every aspect of technology and industry. The complexity and diversity of metals applications emphasize the need for a new production method to quickly and easily manufacture metallic components. Spark plasma sintering as a new solidstate sintering method has been recently developed to respond to these needs. Up to now, numerous papers and researches have been published in the field of spark plasma sintering and its ability to manufacture metallic samples. Density is a significant property that has a great influence on the physical, mechanical, and functional properties of metallic parts. To the best of our knowledge, there is no concrete paper that reviews the densification behavior of metals and alloys during spark plasma sintering and the effect of its parameters on the density of metallic samples. As a result, this article dedicated to addressing this need. In this mini-review, after a short description of spark plasma sintering method, the effects of each sintering parameters on densification behavior of metals and alloys are studied, and possible physical and microstructural factors which have the effect of densification behavior of metallic samples at various sintering conditions are reviewed. Finally, the recent advances in finite element modeling, which study the temperature and stress inhomogeneity in the SPS process, have been reviewed in this paper.

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Study on microstructure and mechanical properties of spark plasma sintered Alumix 431 powder

Cited by 13 publications

References 18 publications

Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy

Microstructure and Mechanical Properties of Spark Plasma Sintered and Severely Deformed AA7075 Alloy

Spark plasma sintering and spark plasma upsetting of an Al-Zn-Mg-Cu alloy

The densification behavior of metals and alloys during spark plasma sintering: A mini-review

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