Article
Chemistry, Physical
Alexey Sherchenkov, Nikolai Borgardt, Maxim Shtern, Yuliya Zaytseva, Yury Shtern, Maxim Rogachev, Vadim Sazonov, Alexey Yakubov, Dmitry Pepelyaev
Summary: A nanostructured n-type thermoelectric material based on lead telluride was fabricated and investigated. The synthesis of PbTe, grinding of the synthesized PbTe, and compaction of the nanopowders by spark plasma sintering were employed in the fabrication process. The nanostructured PbTe showed improved thermoelectric performance compared to the TE material obtained by hot pressing, with the maximum dimensionless thermoelectric figure of merit (ZT) being 1.35. The increase in ZT for nanostructured PbTe was attributed to the decrease in lattice thermal conductivity.
MATERIALS TODAY ENERGY
(2023)
Article
Materials Science, Multidisciplinary
T. Sathish, R. Saravanan, Anuj Kumar, Chander Prakash, Mohd Shahazad, Manish Gupta, N. Senthilkumar, Bidhan Pandit, Mohd Ubaidullah, Vladimir A. Smirnov
Summary: This study aimed to enhance the mechanical, wear, and corrosion properties of aluminium alloy AA5083 by incorporating nanoparticles as reinforcements, resulting in hybrid aluminium nanocomposites. The effects of different parameters in the powder metallurgy process were evaluated and analyzed using DOE, and the results showed a significant correlation between mixing time and microhardness of the nanocomposites. The study also found that sintering time had a significant impact on wear and corrosion reduction rates. The highest recorded microhardness value was 136 VHN, while the lowest observed rates of wear and corrosion were 0.192 mm3/m and 0.00081 mm/year, respectively.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Tingjun Wu, Jae-Hong Lim, Kyu-Hwan Lee, Jiwon Kim, Nosang V. Myung
Summary: The study demonstrates that the crystal grain boundary and Te nano-inclusion in the Te-embedded PbTe thick films play critical roles in their thermoelectric properties. Thick films with an average grain size of around 100 nm showed lower energy barrier height, resulting in an increased power factor.
Article
Materials Science, Multidisciplinary
Matej Brezina, Michaela Hasonova, Stanislava Fintova, Pavel Dolezal, Andrii Rednyk, Jaromir Wasserbauer
Summary: Field-assisted sintering, specifically using spark plasma sintering (SPS), was employed to prepare magnesium materials in this study, revealing that loose powder cold-compacted samples yielded better results than green compacts. Increasing cold-compaction pressure of green compacts reduced porosity, while SPS only positively affected properties in loose powder and low cold-compacted green compacts.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Eduardo Reverte, Clement Keller, Monique Calvo-Dahlborg, German Alcala, Monica Campos, Juan Cornide
Summary: The influence of Y2O3 addition by mechanical alloying on the microstructure evolution of a BCC High Entropy Alloy was investigated. X-ray diffraction, SEM, EBSD, and nano-indentation were used for characterization and mechanical properties exploration. The microstructure of the sintered alloy showed ordered and disordered BCC phases, as well as a minor FCC phase. The introduction of oxide reinforcements and microstructure refinement through mechanical alloying resulted in a change in phase quantification and grain structure, leading to increased hardness and elastic modulus in the consolidated samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Min Soo Park, Gook-Hyun Ha, Yong Ho Park, Hye Young Koo
Summary: The study investigated the effect of the Bi/Sb compositional ratio on the thermoelectric properties in p-type Bi-Sb-Te alloys, achieving optimized carrier concentration by controlling the Bi/Sb ratio. The results showed that increasing Bi concentration led to decreased carrier concentration and thermal conductivity, as well as increased See-beck coefficient and specific resistance.
SCIENCE OF ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Pradeep Kumar Sharma, T. D. Senguttuvan, V. K. Sharma, Pankaj Patro, Sujeet Chaudhary
Summary: In this study, the thermoelectric performance of PbTe compound was significantly improved through bismuth doping and dispersing SiC nanoparticles. Bismuth doping improved the electrical conductivity, while SiC nanoparticles regulated the Seebeck coefficient and suppressed the lattice thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zijun Qin, Qianyi Li, Guowei Wang, Feng Liu
Summary: This research focuses on the microstructure and defects of spark plasma sintering (SPS) prepared powder metallurgy (PM) nickel-based superalloys. The study specifically analyzes the densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS. The results indicate that the application of SPS technology at sub-solidus temperature effectively reduces the formation of a prior particle boundary (PPB), enhancing the material performance of PM nickel-based superalloys.
Article
Materials Science, Multidisciplinary
Philipp Sauerschnig, Priyanka Jood, Michihiro Ohta
Summary: By adjusting the Na doping content, the material stability and mechanical properties of nanostructured p-type Pb0.993-xNaxGe0.007Te are improved while maintaining a high thermoelectric figure of merit zT. The presence of detrimental Na-rich impurity phases is eliminated by reducing the Na doping from 4% to 2%. Co80Fe20 contact layers improve the conversion efficiency of Pb0.973Na0.02Ge0.007Te and Pb0.98Ga0.02Te.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Abhishek Sharma, Yoshiaki Morisada, Hidetoshi Fujii
Summary: This study successfully fabricated Al/0.1 wt% graphene nanoplatelet (GNP) composites using the combination of spark plasma sintering (SPS) and solid-state multi-pass friction stir processing (FSP). Increasing the number of FSP passes significantly enhanced the dispersion of GNPs in the Al matrix and the consolidation of the SPSed compacts. The ultimate tensile strength of the Al/GNP composite increased with the number of FSP passes, with a maximum increment of 31% achieved after 3-pass FSP.
MATERIALS CHARACTERIZATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Drahomir Dvorsky, Jiri Kubasek, Michaela Roudnicka, Filip Prusa, David Necas, Peter Minarik, Jitka Straska, Dalibor Vojtech
Summary: Powder size has a significant impact on the microstructure, mechanical, and corrosion properties of WE43 alloy, with smaller powder particles improving corrosion resistance but decreasing mechanical properties. HF pre-treatment of the powder can help reduce the corrosion rate of the compacted materials.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Ceramics
Ozer Pamuk, Yavuz Kaplan, Sinan Aksoz
Summary: The study investigated the effects of different heat treatment regimes on the hardness and wear behavior of pure Fe and graphite-reinforced Fe-based composite materials. It was found that the low-pressure cementation heat treatment significantly increased hardness, with the highest wear resistance observed in the sample with 0.4% graphite reinforcement and only low-pressure cementation applied.
POWDER METALLURGY AND METAL CERAMICS
(2021)
Article
Materials Science, Multidisciplinary
Elumalai Pc, Ganesh Radhakrishnan, Shankar Emarose
Summary: In this study, monolithic pure magnesium and magnesium composites with different proportions of TiO2 nanoparticles were synthesized using powder metallurgy technique and processed by two-stage hybrid microwave sintering and hot extrusion. The results showed that the mass density and microhardness of the composite materials increased steadily with the addition of TiO2 nanoparticles, with the Mg5TiO2 composite exhibiting the highest compressive strength.
MATERIALS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Qiangqiang Nie, Guohong Chen, Bing Wang, Lei Yang, Jianhua Zhang, Wenming Tang
Summary: Cu/Invar bi-metal matrix composites show great potential as novel electronic packaging materials. The size of Invar particles affects the microstructures and properties of the composites, with finer Invar particles leading to finer Cu grain sizes and improved thermal conductivity. Sintering temperature also plays a critical role in determining the properties of the composites, with 700 degrees Celsius sintered composites exhibiting the highest thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Raquel de Oro Calderon, Christian Gierl-Mayer, Herbert Danninger
Summary: The sintering stage is crucial for establishing microstructure and properties in powder metallurgy processing. Thorough studying of the chemical and metallurgical processes occurring during sintering is essential for optimal product properties. Thermoanalytical techniques combined with mass spectroscopy enable in-situ characterization of the sintering process from multiple perspectives.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)