scholarly journals High strength-high conductivity carbon nanotube-copper wires with bimodal grain size distribution by spark plasma sintering and wire-drawing

2017 ◽  
Vol 137 ◽  
pp. 78-82 ◽  
Author(s):  
David Mesguich ◽  
Claire Arnaud ◽  
Florence Lecouturier ◽  
Nelson Ferreira ◽  
Geoffroy Chevallier ◽  
...  
Keyword(s):  
Grain Size ◽  
Carbon Nanotube ◽  
Size Distribution ◽  
Spark Plasma Sintering ◽  
Grain Size Distribution ◽  
High Strength ◽  
Wire Drawing ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Bimodal Grain Size

Multimodal grain size distribution and high hardness in fine grained tungsten fabricated by spark plasma sintering

2011 ◽  
Vol 528 (18) ◽  
pp. 5670-5677 ◽  
Author(s):  
Osman El-Atwani ◽  
Dat V. Quach ◽  
Mert Efe ◽  
Patrick R. Cantwell ◽  
Bryan Heim ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Spark Plasma Sintering ◽  
Grain Size Distribution ◽  
High Hardness ◽  
Fine Grained ◽  
Plasma Sintering ◽  
Spark Plasma

A Model for Predicting the Failure Behavior of Bimodal Nanocrystalline Materials

2014 ◽  
Vol 1081 ◽  
pp. 132-137
Author(s):  
Song Feng Tian ◽  
Hong Jian Yu ◽  
Ying Guang Liu ◽  
Rong Yuan Ju ◽  
Xiao Dong Mi ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Nanocrystalline Materials ◽  
Volume Fraction ◽  
High Strength ◽  
Failure Behavior ◽  
Failure Properties ◽  
Bimodal Grain Size ◽  
Bimodal Grain Size Distribution

Giving a bimodal grain size distribution in nanocrystalline materials can effectively achieve both high strength and high ductility. Here we propose a theoretical model to study the failure behavior of nc materials with bimodal grain size distribution. The dependence of failure properties on grain size distribution were calculated. Numerical results show the strength and ductility of bimodal nanocrystalline materials are sensitive to grain size and the volume fraction of coarse grains.

scholarly journals Exploring the Strain Hardening Mechanisms of Ultrafine Grained Nickel Processed by Spark Plasma Sintering

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 65
Author(s):  
Lucía García de la Cruz ◽  
Mayerling Martinez Celis ◽  
Clément Keller ◽  
Eric Hug
Keyword(s):  
Grain Size ◽  
Strain Hardening ◽  
Spark Plasma Sintering ◽  
High Strength ◽  
Electron Backscattered Diffraction ◽  
Plasma Sintering ◽  
Ultrafine Grained ◽  
Spark Plasma ◽  
Deformed State ◽  
Hardening Mechanisms

Ultrafine grained (UFG) materials in the bigger grain size range (0.5–1) µm display a good combination of strength and ductility, unlike smaller size UFG and nanostructured metals, which usually exhibit high strength but low ductility. Such difference can be attributed to a change in plasticity mechanisms that modifies their strain hardening capability. The purpose of this work is to investigate the work hardening mechanisms of UFG nickel considering samples with grain sizes ranging from 0.82 to 25 µm. Specimens processed combining ball milling and spark plasma sintering were subjected to monotonous tensile testing up to fracture. Then, microstructural observations of the deformed state of the samples were carried out by electron backscattered diffraction and transmission electron microscopy. A lower strain hardening capability is observed with decreasing grain size. Samples in the submicrometric range display the three characteristic stages of strain hardening with a short second stage and the third stage beginning soon after yielding. Microstructural observations display a low fraction of low angle grain boundaries and dislocation density for the sample with d = 0.82 µm, suggesting changes in plasticity mechanisms early in the UFG range.

scholarly journals Synthesis, microstructure, and properties of high purity Mo2TiAlC2 ceramics fabricated by spark plasma sintering

2020 ◽  
Vol 9 (6) ◽  
pp. 759-768
Author(s):  
Yunhui Niu ◽  
Shuai Fu ◽  
Kuibao Zhang ◽  
Bo Dai ◽  
Haibin Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Layered Structure ◽  
High Purity ◽  
High Fracture Toughness ◽  
Temperature Range ◽  
Microstructure And Properties ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractThe synthesis, microstructure, and properties of high purity dense bulk Mo2TiAlC2 ceramics were studied. High purity Mo2TiAlC2 powder was synthesized at 1873 K starting from Mo, Ti, Al, and graphite powders with a molar ratio of 2:1:1.25:2. The synthesis mechanism of Mo2TiAlC2 was explored by analyzing the compositions of samples sintered at different temperatures. It was found that the Mo2TiAlC2 phase was formed from the reaction among Mo3Al2C, Mo2C, TiC, and C. Dense Mo2TiAlC2 bulk sample was prepared by spark plasma sintering (SPS) at 1673 K under a pressure of 40 MPa. The relative density of the dense sample was 98.3%. The mean grain size was 3.5 μm in length and 1.5 μm in width. The typical layered structure could be clearly observed. The electrical conductivity of Mo2TiAlC2 ceramic measured at the temperature range of 2–300 K decreased from 0.95 × 106 to 0.77 × 106 Ω–1·m–1. Thermal conductivity measured at the temperature range of 300–1273 K decreased from 8.0 to 6.4 W·(m·K)–1. The thermal expansion coefficient (TEC) of Mo2TiAlC2 measured at the temperature of 350–1100 K was calculated as 9.0 × 10–6 K–1. Additionally, the layered structure and fine grain size benefited for excellent mechanical properties of low intrinsic Vickers hardness of 5.2 GPa, high flexural strength of 407.9 MPa, high fracture toughness of 6.5 MPa·m1/2, and high compressive strength of 1079 MPa. Even at the indentation load of 300 N, the residual flexural strength could hold 84% of the value of undamaged one, indicating remarkable damage tolerance. Furthermore, it was confirmed that Mo2TiAlC2 ceramic had a good oxidation resistance below 1200 K in the air.

scholarly journals Influence of bimodal grain size distribution on the corrosion resistance of Mg-4Li-3Al-1Zn (LAZ431)

2021 ◽  
Author(s):  
Anna Dobkowska ◽  
Boguslawa Adamczyk – Cieślak ◽  
Dariusz Kuc ◽  
Eugeniusz Hadasik ◽  
Tomasz Płociński ◽  
...  
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Bimodal Grain Size ◽  
Bimodal Grain Size Distribution

Reinforcing effect on the tribological behaviour of nanoparticles due to a bimodal grain size distribution

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55383-55387 ◽  
Author(s):  
Nan Xu ◽  
Weimin Li ◽  
Ming Zhang ◽  
Gaiqing Zhao ◽  
Xiaobo Wang
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Tribological Performance ◽  
Tribological Behaviour ◽  
Reinforcing Effect ◽  
Bimodal Grain Size ◽  
Bimodal Grain Size Distribution

A novel reinforcing mechanism for the tribological performance based on a bimodal grain size distribution is reported.

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