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Microstructure and Micromechanical Behaviors of Bulk Amorphous Alloy Prepared by Spark Plasma Sintering

Yaqiong Ge Zexin Chang Wenxian Wang Qingling Hou
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 31-36 | DOI: 10.24425/amm.2023.141468
Keywords Bulk amorphous alloy Spark Plasma Sintering (SPS) Microstructure Micromechanical behaviors
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Abstract

This study aimed to prepare Zr55Cu30Al10Ni5 bulk amorphous alloys by spark plasma sintering of raw amorphous alloy powders and investigate their microstructure and micromechanical behaviors. When the sintering temperature ( Ts) was 675K, which was lower than the glass transition temperature ( Tg) of the material, the sintered sample was almost fully amorphous but the density was lower. However, when Ts was 705K, which was higher than Tg, partial crystallization occurred, but the density was higher. The hardness of the bonding zone of the sintered sample at 675K was 5.291 GPa due to the lower density, which was lower than that at 705K, and the hardness at 705K was 8.836 GPa. The generation of thermodynamically stable intermetallic phases, the hardness, and the elastic modulus of the samples sintered above Tg were higher due to the higher density.
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Authors and Affiliations

Yaqiong Ge
1
Zexin Chang
1
Wenxian Wang
1
Qingling Hou
1
  1. Taiyuan University of Science and Technology, College of Materials Science and Engineering, Taiyuan 030024, China

Electrophysical Properties of the Multiferroic BFN-Ferrite Composites Obtained by Spark Plasma Sintering and Classical Technology

D. Bochenek P. Niemiec D. Brzezińska
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 2 | 799-804 | DOI: 10.24425/amm.2020.132823
Keywords Multiferroic composites BFN ceramics Spark Plasma Sintering (SPS)
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Abstract

In the paper the multiferroic (ferroelectric-ferromagnetic) composites based on ferroelectromagnetic/ferroelectric (BaFe1/2Nb1/2O3 (BFN)) powder and ferrite powder (zinc-nickel ferrite) were obtained by two technological methods. In the composite samples the ratio of the ferroelectromagnetic/ferroelectric powder to the magnetic powder was equal to 90:10. The ceramic powders were synthesized by the classical technological method using powder calcination/solid state synthesis, while densification of the composite powders (sintering) was carried by two different methods: (i) Free Sintering method (FS), and (ii) Spark Plasma Sintering (SPS).

At the work, a comparison of measurement results for composite samples obtained by two sintering methods was made. The studies included the following analysis: DTA, XRD, SEM, DC electrical conductivity, electric permittivity and magnetic properties. The result of measurements presented in the work revealed that the ceramic composite obtained by two different technological sintering method (classical technology – Free Sintering method and Spark Plasma Sintering technique) can be promising lead-free materials for functional applications, for example in sensors for magnetic and electric field.

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Authors and Affiliations

D. Bochenek
P. Niemiec
D. Brzezińska

Evaluation of the Mechanical and Electrical Properties of Spark Plasma Sintered Titanium Carbide Reinforced Alumina Ceramic Composite

G. Selvakumar S. Prakash K. Rajkumar
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 831-838 | DOI: 10.24425/amm.2021.136387
Keywords Spark Plasma Sintering (SPS) Alumina composite TiC Mechanical properties fracture toughness
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Abstract

Spark Plasma Sintering (SPS) is identified as a suitable technique to prepare the alumina titanium carbide composite to overcome the difficulty in fabricating it through other consolidation method. The present work focuses on the fabrication and characterization of a series of titanium carbide reinforced alumina ceramic composites using a spark plasma sintering process. The titanium carbide reinforcement on the alumina matrix is varied between 20 and 35 wt.%, in order to improve the electrical conductivity and fracture toughness of the composites. The particle size of the starting powders at received and ball milled conditions was analysed through Particle size analyser and Scanning Electron Microscope (SEM). Microstructural analysis revealed that the TiC reinforcement is uniformly dispersed in the sintered composite. XRD report showed that α-alumina and titanium carbide were the two dominant phases without the formation of any reaction phases. Further, the correlation between mechanical and physical properties of the prepared composite was investigated as a function of TiC. Various fracture toughening indicators like crack deflection, bridging and branching were analysed by Vicker’s indentation method. Electrical resistivity of the sintered compact decreases proportionally with the increase in titanium carbide constituents. Maximum density (98.80%) and hardness (20.56 GPa) was obtained for 30 wt. % reinforced composite. Almost 40% improvement in fracture toughness is noted for 25 wt. % reinforced composite. This work demonstrates the synthesis and fabrication of alumina titanium carbide composites at low temperature via SPS resulted in obtaining an intact compact with improved mechanical and electrical properties.
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Authors and Affiliations

G. Selvakumar
1
S. Prakash
1
K. Rajkumar
1
  1. Department of Mechanical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, India

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