Interparticle Liquid Film Formation during Spark Plasma Sintering of Inconel 718 Superalloy

2011 ◽  
Vol 409 ◽  
pp. 763-768
Author(s):  
David Levasseur ◽  
Mathieu Brochu
Keyword(s):  
Spark Plasma Sintering ◽  
Inconel 718 ◽  
Film Formation ◽  
Full Density ◽  
Heating Rates ◽  
Machining Time ◽  
Fast Heating ◽  
Plasma Sintering ◽  
Main Challenge ◽  
Spark Plasma

The use of powder metallurgy for near net shape sintering of superalloy could lead to major savings in machining time and material. The main challenge in sintering Inconel 718 is to avoid the formation of a prior particle boundary (PPB) network that is deleterious to the mechanical properties. Using the Spark Plasma Sintering (SPS) technique, it is believed that Inconel 718 powders could be sintered without forming a PPB network due to the fast heating rate achieved and the reported cleaning effect of particle surfaces by the interparticle arc discharges. In this study, Inconel 718 was consolidated to near-full density at 1200°C under 50 MPa of pressure with heating rates ranging from 20°C/min to 800°C/min. The densification behavior of the powder was studied through the analysis of the densification curves and observation of the microstructure evolution from interrupted tests. The fast densification of Inconel 718 in SPS was linked to the formation of a supersolidus liquid phase due to the nature of the heating in this technique.

Nearly full density Ni52.5Nb10Zr15Ti15Pt7.5 bulk metallic glass obtained by spark plasma sintering of gas atomized powders

2007 ◽  
Vol 90 (24) ◽  
pp. 241902 ◽  
Author(s):  
Guoqiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Hisamichi Kimura ◽  
Akihisa Inoue
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Spark Plasma Sintering ◽  
Full Density ◽  
Plasma Sintering ◽  
Spark Plasma

Microstructure and Mechanical Properties of Spark-Plasma-Sintered SiC-TiC Composites

2005 ◽  
Vol 287 ◽  
pp. 335-339 ◽  
Author(s):  
Kyeong Sik Cho ◽  
Kwang Soon Lee
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Applied Pressure ◽  
Argon Atmosphere ◽  
Full Density ◽  
Plasma Sintering ◽  
Spark Plasma

Rapid densification of the SiC-10, 20, 30, 40wt% TiC powder with Al, B and C additives was carried out by spark plasma sintering (SPS). In the present SPS process, the heating rate and applied pressure were kept at 100°C/min and at 40 MPa, while the sintering temperature varied from 1600-1800°C in an argon atmosphere. The full density of SiC-TiC composites was achieved at a temperature above 1800°C by spark plasma sintering. The 3C phase of SiC in the composites was transformed to 6H and 4H by increasing the process temperature and the TiC content. By tailoring the microstructure of the spark-plasma-sintered SiC-TiC composites, their toughness could be maintained without a notable reduction in strength. The strength of 720 MPa and the fracture toughness of 6.3 MPa·m1/2 were obtained in the SiC-40wt% TiC composite prepared at 1800°C for 20 min.

Fabrication of highly compact Inconel 718 alloy by spark plasma sintering and solution treatment followed by aging

Vacuum ◽  
2019 ◽  
Vol 163 ◽  
pp. 194-203 ◽  
Author(s):  
Shuaijiang Yan ◽  
Qingxiang Wang ◽  
Xing Chen ◽  
Chengsong Zhang ◽  
Guodong Cui
Keyword(s):  
Spark Plasma Sintering ◽  
Inconel 718 ◽  
Solution Treatment ◽  
Inconel 718 Alloy ◽  
Plasma Sintering ◽  
Spark Plasma

Corrosion-Resistance of Ni3Al Intermetallic Compounds Containing Cr Synthesized via Spark Plasma Sintering Process

2012 ◽  
Vol 581-582 ◽  
pp. 1006-1009
Author(s):  
Nian Liu ◽  
Guo Dong Zhang ◽  
Jin Lu Wu ◽  
Fu Ju Zhang ◽  
Jian Qiang Zhang
Keyword(s):  
Corrosion Resistance ◽  
Intermetallic Compounds ◽  
Spark Plasma Sintering ◽  
Chromium Content ◽  
Full Density ◽  
Sintering Process ◽  
Anode Polarization ◽  
Plasma Sintering ◽  
Hardness Tests ◽  
Spark Plasma

Ni3Al intermetallic compounds containing Cr was synthesized via Spark Plasma Sintering process. These Ni3Al intermetallic compounds containing Cr have a nearly full density after sintered at 1100 °C for 5 min under the pressure of 40MPa. Microstructure and hardness of these intermetallic compounds was studied through metallograph observation and micro hardness tests. Their formation and strengthening mechanisms were analyzed and discussed in detail. The influence of the chromium content on corrosion resistance of these intermetallic compounds was analyzed by anode polarization curves. Results show that the corrosion resistance of Ni3Al intermetallic compounds is upgraded significantly with increasing chromium content.

Recent Advances on Bulk Tantalum Carbide Produced by Solvothermal Synthesis and Spark Plasma Sintering

2012 ◽  
Vol 1485 ◽  
pp. 9-20 ◽  
Author(s):  
Braeden M. Clark ◽  
James P. Kelly ◽  
Olivia A. Graeve
Keyword(s):  
Spark Plasma Sintering ◽  
Tantalum Carbide ◽  
Synthesis Process ◽  
Full Density ◽  
Sintering Behavior ◽  
X Ray Diffraction ◽  
Plasma Sintering ◽  
Different Temperatures ◽  
Spark Plasma ◽  
Carbon Additions

ABSTRACTThe sintering of tantalum carbide nanopowders by spark plasma sintering (SPS) is investigated. The washing procedure for the powders is modified from previous work to eliminate excess lithium in the powders that is left over from the synthesis process. The sintering behavior of the nanopowders is investigated by X-ray diffraction and scanning electron microscopy by studying specimens that were sintered to different temperatures. To improve the homogeneity of the microstructure of the specimens, milling procedures were implemented. Vaporization during sintering is observed, and the usefulness of carbon additions and systematic decreases in temperature to curb this behavior was explored. Future experiments to achieve full density and to maintain a nanostructure of the specimens include sintering with higher pressures, lower temperatures, and longer dwell times. Additives for maintaining a nanostructure and developing suitable high-temperature properties are also discussed.

scholarly journals Synthesis of Ceramic Reinforcements in Metallic Matrices during Spark Plasma Sintering: Consideration of Reactant/Matrix Mutual Chemistry

Ceramics ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 592-599
Author(s):  
Dina V. Dudina ◽  
Tomila M. Vidyuk ◽  
Michail A. Korchagin
Keyword(s):  
Spark Plasma Sintering ◽  
Structural Evolution ◽  
Ceramic Composites ◽  
Ex Situ ◽  
Full Density ◽  
Powder Materials ◽  
Plasma Sintering ◽  
Processing Step ◽  
Spark Plasma

Metal–ceramic composites are obtained via ex-situ or in-situ routes. The in-situ route implies the synthesis of reinforcement in the presence of a matrix and is often regarded as providing more flexibility to the microstructure design of composites than the ex-situ route. Spark plasma sintering (SPS) is an advanced sintering method that allows fast consolidation of various powder materials up to full or nearly full density. In reactive SPS, the synthesis and consolidation are combined in a single processing step, which corresponds to the in-situ route. In this article, we discuss the peculiarities of synthesis of ceramic reinforcements in metallic matrices during SPS with a particular consideration of reactant/matrix mutual chemistry. The formation of carbide reinforcements in Cu, Al, and Ni matrices is given attention with examples elaborated in the authors’ own research. Factors determining the suitability of reactive SPS for manufacturing of composites from a matrix/reactants system and features of the structural evolution of the reaction mixture during sintering are discussed.

Examination of microstructure evolution and strengthening mechanisms in an aluminum-based hybrid composite prepared through the spark plasma sintering method

2020 ◽  
Vol 117 (6) ◽  
pp. 613
Author(s):  
Mohammad Reza Rezaei ◽  
Alireza Albooyeh ◽  
Hassan Shiraghaei ◽  
Misagh Shayestefar
Keyword(s):  
Yield Strength ◽  
Spark Plasma Sintering ◽  
Hybrid Composite ◽  
Full Density ◽  
Interfacial Region ◽  
Strengthening Mechanisms ◽  
Consolidation Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Difference

A bulk hybrid composite to be potentially used as a foam precursor was produced in this study. TiH2 powder particles along with different concentrations of SiC were mixed with pure Al particles and consolidated through the spark plasma sintering (SPS) method. Bulk samples with nearly full density were successfully produced using the SPS method. During the consolidation process, no additional phases were found within the ceramic particles/matrix interfacial region. Using the ceramic TiH2 and SiC particles as the reinforcement cause notably strengthened the pure Al matrix (37% higher yield strength) without adversely affecting the plasticity, helping retain strain to fracture of about 50% for the sample. The yield strength of the samples was quantitatively approximated by examining their strengthening mechanisms via a number of simplified models available in the literature. The analyses found grain boundary and dislocation strengthening to be the most effective mechanisms for enhancing the strength of the samples; it was also found that the difference between the approximated and experimentally obtained overall yield strength was negligible.

scholarly journals Calculation of the Temperature Distribution in Cylindrical Samples of Alumina and Copper Produced by Spark Plasma Sintering

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 437-446
Author(s):  
Vyacheslav V. Krizhanovskiy ◽  
Vyacheslav I. Mali
Keyword(s):  
Electrical Conductivity ◽  
Temperature Distribution ◽  
Aluminum Oxide ◽  
Physicochemical Properties ◽  
Spark Plasma Sintering ◽  
Numerical Calculations ◽  
Heating Rates ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Cylindrical Samples

Numerical calculations were carried out to simulate, under conditions of close spark plasma sintering (SPS), the temperature distribution during the passage of current in dense cylindrical samples of two materials: aluminum oxide and copper located in graphite forms and clamped between cylindrical graphite punches. The investigated materials differ greatly in their electrical conductivity and other physicochemical properties. Calculations were carried out for various geometric parameters of the samples, as well as graphite molds and punches at varying heating rates from the passing current.

Consolidation Behavior of Cu-Zr-Al Metallic Glass Powder by Spark Plasma Sintering

2010 ◽  
Vol 654-656 ◽  
pp. 1086-1089 ◽  
Author(s):  
Guo Qiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Mikio Fukuhara ◽  
Hisamichi Kimura ◽  
Akihisa Inoue
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Glassy Alloy ◽  
High Strength ◽  
Alloy System ◽  
Full Density ◽  
Large Size ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Consolidation Behavior

We investigated consolidation behavior of gas-atomized Cu50Zr45Al5 metallic glassy alloy powders by a spark plasma sintering (SPS) process. Density of the sintered samples increased with an increase in sintering temperature. The nearly full density samples without crystallization could be attained by the SPS process at sintering temperature of 693 K under pressure of 600 MPa. The produced samples exhibited high-strength and met large-size requirement. The SPS process makes it possible to fabricate the large-size bulk metallic glasses without limitation of dimensions and alloy system.

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