scholarly journals Effects of Milling Time and Process Control Agent on the Austenite Stability of Nanocrystalline Fe–10%Mn Alloy Obtained via Spark Plasma Sintering

2018 ◽  
Vol 59 (7) ◽  
pp. 1206-1209
Author(s):  
Keunhak Kim ◽  
Seung-Jin Oh ◽  
Dongsung Park ◽  
In-Jin Shon ◽  
Seok-Jae Lee
Keyword(s):  
Process Control ◽  
Spark Plasma Sintering ◽  
Milling Time ◽  
Control Agent ◽  
Process Control Agent ◽  
Austenite Stability ◽  
Plasma Sintering ◽  
Spark Plasma

Production of Dispersion-Strengthened Cu-TiB2 Alloys by Ball-Milling and Spark-Plasma Sintering

2007 ◽  
Vol 534-536 ◽  
pp. 1489-1492 ◽  
Author(s):  
Dae Hwan Kwon ◽  
Jong Won Kum ◽  
Thuy Dang Nguyen ◽  
Dina V. Dudina ◽  
Pyuck Pa Choi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Ball Mill ◽  
Milling Time ◽  
Rotation Speed ◽  
Sintering Temperature ◽  
Milled Powder ◽  
Plasma Sintering ◽  
Spark Plasma

Dispersion-strengthened copper with TiB2 was produced by ball-milling and spark plasma sintering (SPS).Ball-milling was performed at a rotation speed of 300rpm for 30 and 60min in Ar atmosphere by using a planetary ball mill (AGO-2). Spark-plasma sintering was carried out at 650°C for 5min under vacuum after mechanical alloying. The hardness of the specimens sintered using powder ball milled for 60min at 300rpm increased from 16.0 to 61.8 HRB than that of specimen using powder mixed with a turbular mixer, while the electrical conductivity varied from 93.40% to 83.34%IACS. In the case of milled powder, hardness increased as milling time increased, while the electrical conductivity decreased. On the other hand, hardness decreased with increasing sintering temperature, but the electrical conductiviey increased slightly

Austenite Stability and Mechanical Properties of Nanocrystalline FeNiCrMoMnSiC Alloy Fabricated by Spark Plasma Sintering

2021 ◽  
Vol 28 (4) ◽  
pp. 336-341
Author(s):  
Jungbin Park ◽  
Junhyub Jeon ◽  
Namhyuk Seo ◽  
Gwanghun Kim ◽  
Seung Bae Son ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Austenite Stability ◽  
Plasma Sintering ◽  
Spark Plasma

Synthesis of Fullerene by Spark Plasma Sintering and Thermomechanical Transformation of Fullerene Into Diamond on Fe-C Composites

2009 ◽  
Vol 1243 ◽  
Author(s):  
Francisco C. Robles-Hernández ◽  
H. A. Calderon
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Thermomechanical Processing ◽  
Control Agent ◽  
Mechanically Alloyed ◽  
Characterization Methods ◽  
Nanostructured Composite ◽  
Heating And Cooling ◽  
Plasma Sintering ◽  
Spark Plasma

ABSTRACTIn this work, results are presented regarding the characterization of nanostructured Fe matrix composites reinforced with fullerene. The fullerene is a mix of 15 wt.%C60, 5 wt.%C70 and 80 wt.% soot that is the product of the primary synthesis of C60. The composite has been produced by means of mechanical alloying and sintered by Spark Plasma Sintering (SPS). The characterization methods include XRD, SEM and TEM. The C60 and C70 withstand mechanical alloying, SPS, and thermomechanical processing and act as a control agent during mechanical alloying. The results show that the mechanically alloyed and SPS product is a nanostructured composite. A larger amount of C60 is found in the sintered composite than in the original fullerene mix, which is attributed to an in-situ synthesis of C60 during the SPS process. The synthesis of C60 is presumably assisted by the catalytic nature of Fe and the electric field generated during the SPS process. In order to study the effect of high temperature, high strain, high heating and cooling rates on C60, the composite is subjected to a thermomechanical processing; demonstrating that some of the C60 resists the above described environment and some of it partially transforms into diamond.

Preparation and Characterization of Amorphous Soft Magnetic FeSiB Powders and Spark Plasma Sintered Compacts

2014 ◽  
Vol 216 ◽  
pp. 163-168
Author(s):  
Bogdan Viorel Neamţu ◽  
Traian Florin Marinca ◽  
Ionel Chicinaş ◽  
Florin Popa ◽  
Olivier Isnard
Keyword(s):  
Magnetic Properties ◽  
Amorphous Powder ◽  
Control Agent ◽  
Wet Milling ◽  
Soft Magnetic ◽  
Process Control Agent ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ac Magnetization

Wet mechanical alloying (MA) were used to prepare amorphous soft magnetic Fe75Si20B5 (at.%) powders starting from elemental powders of Fe, Si and B. The structural, morphological and magnetic properties of the powders were investigated. It was found that wet MA leads to the amorphisation of the alloy after 40 hours of wet milling using benzene (C6H6) as process control agent (PCA). The influence of the wet MA process on the saturation magnetization of the powders was investigated. Amorphous powder of Fe75Si20B5 (at.%) obtained by wet MA route was used to prepare compacts by spark plasma sintering (SPS). The chosen sintering temperature was 800, 850 and 900 oC. Toroidal samples of Fe75Si20B5 (at.%) were investigated in DC and AC magnetization regime and their magnetic properties were correlated with sintering parameters, compacts density and phases evolution during sintering.

Mechanical Properties of Ti-Nb-X-CPP Biomaterial Fabricated by Spark Plasma Sintering

2011 ◽  
Vol 399-401 ◽  
pp. 1592-1595
Author(s):  
Kee Do Woo ◽  
Sang Hoon Park ◽  
Ji Young Kim ◽  
Sang Mi Kim ◽  
Dong Soo Kang
Keyword(s):  
Elastic Modulus ◽  
Spark Plasma Sintering ◽  
Milling Time ◽  
Raw Materials ◽  
High Energy ◽  
X Ray Diffraction ◽  
Increase Milling Time ◽  
Plasma Sintering ◽  
Low Elastic Modulus ◽  
Spark Plasma

Ti-6Al-4V ELI (Extra Low Interstitial) alloy have been widely used as alternative bone due to its excellent biocompatibility, although it still has many problems such as high elastic modulus and toxic. Therefore, biomaterial with low elastic modulus and nontoxic has to be developed. In this study, the raw materials which are nontoxic elements such as Nb and Mo were mixed and milled in a mixing machine (24h) and a high energy mechanical ball milling machine (1h, 4h and 8h) respectively. Ti-Nb-Mo-CPP composites were fabricated by spark plasma sintering (SPS) at 1000°C under 70MPa using mixed and milled powders. The effects of CPP contents and milling time on biocompatibility and mechanical property have been investigated. By X-ray diffraction (XRD), chemical reaction during the sintering was occurred and revealed new phases, Ti2O, CaO, CaTiO3, and TixPy. Vickers hardness of composites increases with increase milling time and addition of HA contents. Biocompatibility of HA added Ti-Nb-Si alloys were improved.

Mechanical Properties and Microstructures of Severely Plastic Deformed Pure Titanium by Mechanical Milling and Spark Plasma Sintering

2010 ◽  
Vol 667-669 ◽  
pp. 559-564 ◽  
Author(s):  
Masahiro Kubota ◽  
Takuya Ohno
Keyword(s):  
Spark Plasma Sintering ◽  
Mechanical Milling ◽  
Applied Pressure ◽  
Pure Titanium ◽  
Control Agent ◽  
Full Density ◽  
Large Strains ◽  
Plasma Sintering ◽  
Process Formation ◽  
Spark Plasma

Severe plastic deformation (SPD) was applied to pure titanium powder by mechanical milling (MM) process with stearic acid, added as a process control agent (PCA), by using a vibrational ball mill, and MMed powders possessing large strains were subsequently consolidated into bulk materials by spark plasma sintering (SPS) in order to enhance the hardness and strength of pure titanium. Changes in the hardness and constituent phases of the MMed powders have been examined by microhardness measurements and X-ray diffraction. The hardness and microstructure of the SPS materials have also been studied by hardness measurements and optical microscopy. The Vickers microhardness of the pure titanium powders with PCA 0.25 g increased sharply from 189 HV to 513 HV after 8 h of the mechanical milling (MM) process. Formation of TiH2 as the solid-state reaction product occurred in the MMed powder during 4 and 8 h of the MM process. The near full density was obtained for the SPS materials under the condition of an applied pressure at 49 MPa with a sintering temperature at 1073 K for 0.5 h. The Vickers hardness of the SPS material fabricated from 8 h MMed powder with PCA 0.50 g exhibited a maximum value of 1253 HV.

Microstructure Characterization of the Cu-Ti-C Composites Prepared by Mechanical Alloying and Spark Plasma Sintering

2009 ◽  
Vol 610-613 ◽  
pp. 629-634 ◽  
Author(s):  
Jian Zhuang ◽  
Yong Bing Liu ◽  
Zhan Yi Cao ◽  
Yue Ying Li ◽  
X.R. Liu
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Milling Time ◽  
Processing Parameters ◽  
Cu Content ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Evolution Of Microstructure ◽  
Different Content

The evenly dispersed Cu-Ti-C composites have been synthesized successfully from the element powders by mechanical alloying (MA) and spark plasma sintering（SPS）techniques. The evolution of microstructure with different processing parameters has been investigated by XRD and SEM. The Cu-TiC and the Cu-Ti2Cu3-C composites with different hardness and density were obtained from different content of Cu, milling time and sintering temperature. The effect of Cu content in the compound powders, milling times and sintering temperatures on the solid solution and reaction process of Cu-Ti-C system was also discussed and analyzed.

Effects of Milling Time on Microstructure and Mechanical Properties of Composite WC-(Fe3Al-B) Consolidated by Spark Plasma Sintering

2017 ◽  
Vol 899 ◽  
pp. 487-492
Author(s):  
Luis Antonio C. Ybarra ◽  
Afonso Chimanski ◽  
Gilberto J. Pereira ◽  
Izabel Fernanda Machado ◽  
Humberto Naoyuki Yoshimura
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Vickers Hardness ◽  
Milling Time ◽  
Iron Aluminide ◽  
Plasma Sintering ◽  
Hard Metals ◽  
Spark Plasma ◽  
Vibration Milling

Cobalt is widely used to produce WC-Co hard metals, but this binder has problems of shortage and unstable price. In this work, cobalt was replaced by an iron aluminide intermetallic binder. WC-10%(Fe3Al-3%B) composite was prepared by vibration milling of WC, Fe, Fe-B, and Al powders and sintered by spark plasma sintering (SPS) at 1150 °C for 8 min under 30 MPa. The milling time was 0.17, 12, 25 and 50 h. The SPS was efficient to consolidate the composite resulting in relative density of ~98% or higher. With increasing milling time, Vickers hardness (HV30) of composite increased from 12 to 14 GPa due to the enhanced homogeneity of microstructure, while the fracture toughness, KIc, determined by an indention fracture method using Shetty equation, remained constant at around 9.1 MPa.m1/2.

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