High entropy alloys obtained by field assisted powder metallurgy route: SPS and microwave heating

Colombini, Elena; Rosa, Roberto; Trombi, L.; Zadra, M.; Casagrande, A.; Veronesi, Paolo

doi:10.1016/j.matchemphys.2017.06.065

Cited by 50 publications

(16 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on this, FAST/SPS became a powerful tool for target-oriented development of new material systems with tailored microstructures. [9] Recently, FAST/SPS has been successfully applied, e.g., for the development of all-solid-statebattery materials, [16,17] UHTCs, [18] transparent ceramics, [19,20] high entropy alloys, [21] as well as thermoelectric and magnetic materials. [22] Another important area of application is manufacturing of high-performing lightweight alloys based on Al, [23] Mg, [24,25] or titanium, [26] e.g., by controlled crystallization of amorphous starting powders in a FAST/SPS device.…”

Section: Application Of Fast/sps For Synthesis Of High-performing Matmentioning

confidence: 99%

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

et al. 2020

View full text Add to dashboard Cite

Highly efficient energy conversion and storage technologies such as high‐temperature solid oxide fuel and electrolysis cells, all‐solid‐state batteries, gas separation membranes, and thermal barrier coatings for advanced turbine systems depend on advanced materials. In all cases, processing of ceramics and metals starting from powders plays a key role and is often a challenging task. Depending on their composition, such powder materials often require high sintering temperatures and show an inherent risk of abnormal grain growth, evaporation, chemical reaction, or decomposition, especially in the case of long dwelling times. Electric current‐assisted sintering (ECAS) techniques are promising to overcome these restrictions, but a lot of fundamental and practical challenges must be solved properly to take full advantage of these techniques. A broad and long‐term expertise in the field of ECAS techniques and comprehensive facilities including conventional field‐assisted sintering technology/spark plasma sintering (FAST/SPS), hybrid FAST/SPS (with additional heater), sinter forging, and flash sintering (FS) devices are available at the Institute of Energy and Climate Research: Materials Synthesis and Processing (IEK‐1). Herein, main advantages and challenges of these techniques are discussed and the concept to overcome current limitations is introduced on selected examples.

show abstract

Section: Application Of Fast/sps For Synthesis Of High-performing Matmentioning

confidence: 99%

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Microwave heating resulted the less energy intensive one, in the experimental conditions investigated. The small dimensions of the microwave applicator used and the short synthesis time makes this synthetic route interesting from a process intensification point of view and the benefits become particularly relevant in case of manufacturing of near net shape parts is required [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Microwave and Induction Heating Applicator for Metal Making: Design and Testing

Colombini

Papalia²,

Barozzi³

et al. 2020

Metals

View full text Add to dashboard Cite

The use of microwave heating in primary metallurgy is gaining an increasing interest due to the possibility to selectively process ores and to volumetrically heat large amounts of low-thermal conductivity minerals. In this paper the study, development and testing of a new applicator combining the use of microwave and induction heating for rapid reduction of metal containing oxides is described. Numerical simulation was used in order to achieve the proper control over heat generation, considering the use of microwave solid state generators. A prototype, with a capacity up to 5 liters of standard input feed but with the predisposition for continuous processing has been designed, built and tested on reference loads like iron oxide powders and pellets. Results on the microwave heating part of the applicator indicate that it allows to efficiently and rapidly process these kinds of loads, which change from dielectric to conductors as reduction proceeds. The use of variable frequency solid state microwave generators allows to maximize energy efficiency and to controllably change the heating pattern inside the load.

show abstract

“…Frequently, high-temperature homogenization and further hot/cold working followed by recrystallization annealing are needed to break down the as-cast microstructure, thus obtaining homogeneous fine-grain structure materials [10,13,23,24]. During recent years, alternative methods, which are largely based on traditional powder metallurgy (PM) techniques, have been proposed to fabricate AlCo-CrFeNi HEA [16,[25][26][27][28]. Using PM, the AlCoCrFeNi HEA powders is obtained and consolidated into near-fulldensity blocky materials through sintering technology especially the spark plasma sintering (SPS) technology which has the advantages of rapid heating, short soaking time and low energy consumption [16,25,27,29].…”

Section: Introductionmentioning

confidence: 99%

“…During recent years, alternative methods, which are largely based on traditional powder metallurgy (PM) techniques, have been proposed to fabricate AlCo-CrFeNi HEA [16,[25][26][27][28]. Using PM, the AlCoCrFeNi HEA powders is obtained and consolidated into near-fulldensity blocky materials through sintering technology especially the spark plasma sintering (SPS) technology which has the advantages of rapid heating, short soaking time and low energy consumption [16,25,27,29].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical and Corrosion Properties of AlCoCrFeNi High-Entropy Alloy Prepared by Spark Plasma Sintering

Zhou

Xiao

Yuan

2019

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

AlCoCrFeNi is one of the most widely studied alloy systems in the high-entropy alloy (HEA) area due to the interesting microstructure and mechanical properties. In this study, the AlCoCrFeNi alloy was prepared using spark plasma sintering (SPS) with pre-alloy powders obtained through gas atomization. Then, the sintered samples were annealed at 700, 800 and 900 °C, and the effect of annealing temperature on the microstructure, mechanical and corrosion properties was studied. The results show that phase formation takes place during annealing process with the new phase (σ) and some nanoscale BCC precipitates formation. The size and quantity of the nanoscale precipitates increase with increasing annealing temperature. The twin is also observed after annealing at 900 °C. The annealing temperature has an obvious effect on the mechanical properties and corrosion resistance of the spark plasma sintered AlCoCrFeNi HEA. When the annealing temperature is 700 °C, the hardness, yield strength and fracture strength reach the maximum with the value of 545 HV, 1430 MPa and 2230 MPa, respectively. The compressive ratio reaches the maximum of 17.2%, with the annealing temperature increasing to 800 °C. The corrosion resistance of the samples decreases with increasing the annealing temperature.

show abstract

High entropy alloys obtained by field assisted powder metallurgy route: SPS and microwave heating

Cited by 50 publications

References 51 publications

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

A Novel Microwave and Induction Heating Applicator for Metal Making: Design and Testing

Microstructure, Mechanical and Corrosion Properties of AlCoCrFeNi High-Entropy Alloy Prepared by Spark Plasma Sintering

Contact Info

Product

Resources

About