Elaboration of Metallic Materials by SPS: Processing, Microstructures, Properties, and Shaping

Monchoux, Jean‐Philippe; Couret, Alain; Durand, Lise; Voisin, Thomas; Trzaska, Zofia; Thomas, Marc

doi:10.3390/met11020322

Cited by 21 publications

(11 citation statements)

References 98 publications

(151 reference statements)

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“…Since the temperature is measured on the outer surface of the graphite die a negative temperature gradient will exist from the sample to the outer surface. These reasons, in addition to arc generation between powder particles and the local overheating that takes places between the contact points of powder particles may result in higher than measured temperatures and phase separation [32,33].…”

Section: Resultsmentioning

confidence: 99%

Mechanical response and thermal expansion characteristics of spark plasma sintered Zr–La–B–C(O)-based precursor-derived ceramics

Nanda

Chandran

Thiyagarajan

et al. 2022

Advances in Applied Ceramics

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In this work, a Zr-La-B-C(O)-based precursor-derived ceramic system is spark plasma sintered at 1600°C for 10 min. Chemical and phase analysis of the sintered ceramic reveals nanocrystalline ultra-high temperature (UHT) phases of ZrB 2 , ZrC, and La 2 Zr 2 O 7 embedded in a glassy carbon matrix. A comprehensive evaluation of mechanical properties and thermal expansion characteristics correlates well with the presence of phases. Depth-sensing nanoindentation exemplifies high elastic recovery of 91% typically seen in glassy carbons. The hardness and Young's modulus measured to be ∼4.5 and ∼29.5 GPa respectively, seem to be governed mainly by the presence of glassy carbon, and secondarily by stiff B-C bonds and the UHT phases. The linear coefficient of thermal expansion measured from 130°C to 1550°C is ∼7.9 × 10 −6 K −1 and the thermal expansion behaviour is found to be strongly driven by the constituent UHT phases.

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Section: Resultsmentioning

confidence: 99%

Mechanical response and thermal expansion characteristics of spark plasma sintered Zr–La–B–C(O)-based precursor-derived ceramics

Nanda

Chandran

Thiyagarajan

et al. 2022

Advances in Applied Ceramics

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show abstract

“…Equiaxed features are measured to have an average size of $ 4 lm, however, the aspect ratio of columnar features is noted to be $ 50:1 (Ref [37][38][39]. This change in morphology is however, related to the laser scan orientations and capturing the image along specific direction.…”

Section: Composition and Microstructural Analysis In Lmd-ab-316l Ss Alloymentioning

confidence: 99%

Assessment of Microstructural Evolution and Mechanical Properties of Laser Metal Deposited 316L Stainless Steel

Nath

Nanda

Dinda

et al. 2021

J. of Materi Eng and Perform

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Laser metal deposition (LMD) method is considered as a promising additive manufacturing technique owing to its advanced features. This includes printing complex shaped structures via three-dimensional computer-aided-designs, laser cladding and rapid prototyping. In the present study, detailed microstructure-property correlation is pursued for a block of 316L stainless steel alloy, manufactured by LMD. Presence of fully austenitic phase with corresponding residual stresses in the as-built structure is observed through x-ray diffraction analysis. At the first hand, detailed microstructural analysis is done at the bottom and top sections of the block along the build direction. Presence of hatch structures, variation in the layer thickness along with non-uniformity in the grain size and morphology are noted at these sections. An enhancement in the layer thickness and residual stress along with coarsened grain size is noted to exist towards the top section. This is particularly reflected in achieving highest localized hardness at the bottom section, which progressively decreases towards the top, as characterized through nano-indentation. The LMD-manufactured 316L SS alloy however, exhibits strong indentation size effect along with higher global hardness and strengths with respect to the as-cast alloys. This is primarily related to the complex thermal history of the AM technique. Standard solution heat treatment of the LMD-manufactured 316L SS alloy although coarsens the grain size, minimizes the microstructural non-uniformities and residual stress. Such increment in grain size however, leads to reduction in hardness at the macro, micro-and nano-levels, in comparison to the as-built counterparts. Tensile tests of the solutionized 316L alloys reveal a reduction in yield and ultimate tensile strength along with increased ductility and toughness, thereby suggesting solution treatment as a useful measure to optimize the combination of properties. Importantly, the properties are noted to supersede those of the wrought alloys.

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“…A few up-scaled ECAP dies able to produce billets up to 100 mm × 100 mm × 300 mm exist [53], but it is not clear whether these facilities include a second actuator for back pressure. On the other hand, a few industrial SPS facilities currently allow specimens up to 350 mm in diameter and more than 250 mm in height to be obtained, provided that thermal gradients in the sample are minimized, which is not so easy to achieve [54].…”

Section: Comparison Of the Consolidation Processes On Practical Aspectsmentioning

confidence: 99%

Microstructure, Mechanical Properties, and Thermal Stability of Al-Al2O3 Nanocomposites Consolidated by ECAP or SPS from Milled Powders

Lacour-Gogny-Goubert

Doquet

Novelli

et al. 2023

Metals

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Ultrafine-grained Al matrix nanocomposites, reinforced with Al2O3 nanoparticles, were produced from milled powders, either by equal channel angular pressing (ECAP), at room or high temperature, with or without back pressure, or by spark plasma sintering (SPS). Their microstructures, mechanical properties (compression, hardness, and sliding wear), and thermal stabilities (thermally induced softening and cracking) were compared, and the advantages and limitations of each process discussed on a scientific but also practical point of view. For the most successful set of process parameters, the yield stress in compression reached 380 MPa, the hardness, HV = 139, remained stable up to 500 °C, and the resistance to sliding wear was comparable to that of Al 5083, and better than that of Al 7075-T6. While the samples consolidated at high temperatures (by ECAP or SPS) showed a good thermal stability, those consolidated by ECAP at room temperature were prone to thermally induced softening and cracking, which was related to trapped and pressurized gases.

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Elaboration of Metallic Materials by SPS: Processing, Microstructures, Properties, and Shaping

Cited by 21 publications

References 98 publications

Mechanical response and thermal expansion characteristics of spark plasma sintered Zr–La–B–C(O)-based precursor-derived ceramics

Mechanical response and thermal expansion characteristics of spark plasma sintered Zr–La–B–C(O)-based precursor-derived ceramics

Assessment of Microstructural Evolution and Mechanical Properties of Laser Metal Deposited 316L Stainless Steel

Microstructure, Mechanical Properties, and Thermal Stability of Al-Al2O3 Nanocomposites Consolidated by ECAP or SPS from Milled Powders

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