Rapid Consolidation of Nanocrystalline Al2O3 Reinforced Cr Composite from Mechanically Alloyed Powders by Pulsed Current Activated Sintering

2010 ◽  
Vol 123-125 ◽  
pp. 197-200 ◽  
Author(s):  
In Jin Shon ◽  
Hyun Su Kang ◽  
Dong Mok Lee ◽  
Kwon Il Na ◽  
In Yong Ko
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
High Energy ◽  
Pulsed Current ◽  
Mechanically Alloyed ◽  
Activated Sintering ◽  
Simultaneous Application ◽  
Al2o3 Composite ◽  
Average Grain Size ◽  
Energy Ball

Nanopowders of Cr and Al2O3 was fabricated from CrO3 and 2Al by high energy ball milling. Dense nanocrystalline Cr-Al2O3 composite was consolidated by pulsed current activated sintering (PCAS) method within 1 min from mechanically alloyed powders. Highly dense Cr-Al2O3 with relative density of up to 99% was produced under simultaneous application of a 80 MPa pressure and the pulsed current. The average grain size and mechanical properties of the composite were investigated.

Effect of Sintering Temperature on Microstructure and Mechanical Properties of WC-16TiC-xTaC-9Co Cemented Carbides

2012 ◽  
Vol 268-270 ◽  
pp. 340-343
Author(s):  
Chong Cai Zhang ◽  
Quan Wang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Sintering Temperature ◽  
Rupture Strength ◽  
High Energy ◽  
Cemented Carbides ◽  
Average Grain Size ◽  
Comprehensive Performance ◽  
Energy Ball ◽  
Average Size

In this paper, the WC-16TiC-xTaC-9Co and Co are mixed together preparing for WC, (W, Ti, Ta) C. By high-energy ball milling, the powder is cold isostatic pressed and vacuum sintered by 1410°C, 1430°Cand 1450°C.The physical properties and the micrographs of samples are detected. The main conclusions are as following: sintered samples have the best comprehensive performance at 1450°C, the density of the sample is 99.7% and the actual density is 10.91g/cm3. The hardness is 92.8 HRA and the transverse rupture strength (TRS) is 1100MPa. The grain size grows up obviously with the high temperature. The average grain size of WC is 0.7μm and the average size of (W, Ti, Ta)C is 3μm.

scholarly journals Pulsed Current Activated Consolidation of Nanostructured Fe3Al and Its Mechanical Property

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Tae-Wan Kim ◽  
In-Yong Ko ◽  
Jung-Mann Doh ◽  
Jin-Kook Yoon ◽  
In-Jin Shon
Keyword(s):  
Mechanical Property ◽  
Grain Size ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Sintering Behavior ◽  
Pulsed Current ◽  
Activated Sintering ◽  
Energy Ball ◽  
Sintering Method

A nanopowder ofFe3Alwas synthesized from 3Fe and Al by high-energy ball milling. A dense nanostructuredFe3Alwas consolidated by pulsed current activated sintering method within 2 minutes from mechanically synthesized powders ofFe3Aland horizontally milled powders of 3Fe+Al. The grain size, sintering behavior, and hardness ofFe3Alsintered from horizontally milled 3Fe+Al powders and high-energy ball milledFe3Alpowder were compared.

Fabrication of Biocompatible β-Ti-Nb-Sn Alloy by Pulsed Current Activated Sintering Using High Energy Ball Milled Powder

2009 ◽  
Vol 1 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Abdel-Nasser Omran ◽  
Kee Do Woo ◽  
Eui Pyo Kwon ◽  
Nasser A. Barakat ◽  
Hyun Bom. Lee ◽  
...  
Keyword(s):  
Milled Powder ◽  
High Energy ◽  
Pulsed Current ◽  
Activated Sintering ◽  
Energy Ball

Decomposition and Crystallization Induced by High-Energy Ball-Milling

2007 ◽  
Vol 119 ◽  
pp. 1-4 ◽  
Author(s):  
Young Soon Kwon ◽  
Ji Soon Kim ◽  
Cheol Eeh Kim
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
Ball Milling ◽  
Milling Time ◽  
High Energy ◽  
Thermally Induced ◽  
Average Grain Size ◽  
Powder Particles ◽  
Energy Ball ◽  
Decomposition Behavior

Phase transformation induced by ball-milling was studied in this work. It was found that amorphous Fe90Zr10 ribbons undergo crystallization into BCC α-Fe(Zr) under milling in an AGO-2 mill. The decomposition degree of the amorphous phase increased with increasing milling time and intensity. Analyses of samples milled at different speeds suggested that the observed crystallization is a deformation-induced process rather than a thermally induced one. In addition, the decomposition behavior of a FeSn intermetallic under ball-milling was carefully studied. Upon milling a large amount of the FeSn intermetallic decomposed into Fe5Sn3 and FeSn2, where the average grain size of the product phases stayed nearly constant with milling-time. It is suggested that the mechanically driven decomposition of FeSn results from local melting of powder particles due to high temperature pulses during ball collisions.

scholarly journals Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1317
Author(s):  
Amanendra K. Kushwaha ◽  
Merbin John ◽  
Manoranjan Misra ◽  
Pradeep L. Menezes
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Chemical Vapor ◽  
Chemical Precipitation ◽  
High Energy ◽  
Synthesis Methods ◽  
Materials Synthesis ◽  
Current State ◽  
Superior Mechanical Properties ◽  
Energy Ball

Nanostructuring is a commonly employed method of obtaining superior mechanical properties in metals and alloys. Compared to conventional polycrystalline counterparts, nanostructuring can provide remarkable improvements in yield strength, toughness, fatigue life, corrosion resistance, and hardness, which is attributed to the nano grain size. In this review paper, the current state-of-the-art of synthesis methods of nanocrystalline (NC) materials such as rapid solidification, chemical precipitation, chemical vapor deposition, and mechanical alloying, including high-energy ball milling (HEBM) and cryomilling was elucidated. More specifically, the effect of various process parameters on mechanical properties and microstructural features were explained for a broad range of engineering materials. This study also explains the mechanism of grain strengthening using the Hall-Petch relation and illustrates the effects of post-processing on the grain size and subsequently their properties. This review also reports the applications, challenges, and future scope for the NC materials.

Mechanical Properties and Fabrication of Nanostructured 1.5TiAl-Al2O3 Composite by Pulsed Current Activated Sintering

2012 ◽  
Vol 50 (4) ◽  
pp. 310-315 ◽  
Author(s):  
In-Jin Shon ◽  
Won-Baek Kim ◽  
Hee-Ji Wang ◽  
Ki-Min Roh ◽  
Sung-Wook Cho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pulsed Current ◽  
Activated Sintering ◽  
Al2o3 Composite

Preparation of WC-5TiC-10Co Nanometer Powder and Performance Study of Sintering Samples

2012 ◽  
Vol 465 ◽  
pp. 220-223 ◽  
Author(s):  
Chong Cai Zhang ◽  
Quan Wang ◽  
Qun Qun Yuan ◽  
Yong Fei Yang ◽  
Xiao Lan Yi
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Ball Milling ◽  
High Energy ◽  
Cemented Carbides ◽  
Performance Study ◽  
Vacuum Sintering ◽  
Average Grain Size ◽  
Energy Ball ◽  
And Performance

In this paper, the WC-5TiC-10 Co mixture mixed by WC2.96μm, (Ti, W)C 2.52μm and Co2.38μm and prepared by high-energy ball milling. The result shows: After 60h’s ball milling the powder began to reunite more and more as the time extended . The average grain size of powder is 50 nm after144h. After 1300°C~1400°C vacuum-sintering the hardness of the sample is 94.8 ~ 95.4HRA. 4.2 ~ 5.2 HRA higher than the traditional cemented carbides with the same composition. After 1400°C vacuum-sintering the compressive strength and flexural strength of cemented carbides is 2060 MPa and 1200 MPa. Slightly less than the traditional cemented carbides with the same composition.

HAp/TiO2 nanocomposites: Influence of TiO2 on microstructure and mechanical properties

2019 ◽  
Vol 54 (6) ◽  
pp. 765-772 ◽  
Author(s):  
Ajay Kumar Vemulapalli ◽  
Rama Murty Raju Penmetsa ◽  
Ramanaiah Nallu ◽  
Rajesh Siriyala
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Flexural Strength ◽  
Bone Growth ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Energy Ball

Hydroxyapatite is a very attractive material for artificial implants and human tissue restorations because they accelerate bone growth around the implant. The hydroxyapatite nanocomposites (HAp/TiO2) were produced by using high energy ball milling. X-ray diffraction studies revealed the formation of HAp and TiO2 composites. Cubic-like crystals with boundary morphologies were observed; it was also found that the grain size gradually increased with the increase in TiO2 content. It was found that the mechanical properties (hardness, Young's modulus, fracture toughness, flexural strength, and compression strength)of the composites significantly improved with the addition of TiO2, which was sintered at 1200℃. These properties were then also correlated with the microstructure of the composites. This paper investigates the effect of titania (TiO2 = 0, 5, 10, 15, 20, and 25 wt%) addition on the microstructure and mechanical properties of hydroxyapatite (Ca10(PO4)6(OH)2) nanocomposites.

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