High Plastic Ti66Nb13Cu8Ni6.8Al6.2 Composites with In Situ β-Ti Phase Synthesized by Spark Plasma Sintering of Mechanically Alloyed Glassy Powders

2010 ◽  
Vol 638-642 ◽  
pp. 1642-1647 ◽  
Author(s):  
Yuan Yuan Li ◽  
Chao Yang ◽  
Wei Ping Chen ◽  
Xiao Qiang Li ◽  
Sheng Guan Qu
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Fracture Strength ◽  
Microstructure Analysis ◽  
Mechanically Alloyed ◽  
High Fracture ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
High Plastic

High plastic Ti66Nb13Cu8Ni6.8Al6.2 composites with in situ precipitated ductile -Ti phase were firstly synthesized by mechanical alloying and subsequent consolidation by spark plasma sintering with crystallization. Microstructure analysis indicated that all composites contain soft (Cu, Ni)-Ti2 regions and hard -Ti regions, but the two regions have different scale and distribution. The synthesized composites exhibit high fracture strength of 2415 MPa and large plasticity as high as ~31.8%. The large plastic deformability was well explained based on the distinctive microstructure by a developed “hard-soft model”.

Ultrafine-grained Ti66Nb13Cu8Ni6.8Al6.2 composites fabricated by spark plasma sintering and crystallization of amorphous phase

2009 ◽  
Vol 24 (6) ◽  
pp. 2118-2122 ◽  
Author(s):  
Y.Y. Li ◽  
C. Yang ◽  
W.P. Chen ◽  
X.Q. Li ◽  
S.G. Qu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Amorphous Phase ◽  
Fracture Strength ◽  
High Fracture ◽  
Plasma Sintering ◽  
Ultrafine Grained ◽  
Spark Plasma

We report on the formation of ultrafine-grained Ti66Nb13Cu8Ni6.8Al6.2 composites with in situ precipitated micrometer-sized β-Ti(Nb) phase by spark plasma sintering with crystallization. Microstructure analysis indicated that all alloys consisted of soft (Cu, Ni)Ti2 regions surrounded by hard β-Ti(Nb) regions but displayed different microstructures. The alloys exhibited high fracture strength of more than 2200 MPa and remarkable plasticity of ∼25%. The results provided a promising method for fabricating large-sized bulk composites with excellent mechanical properties by powder metallurgy.

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.

Effect of the Mechanical Alloying and Spark Plasma Sintering on Microstructure, Phase Composition and Chemical Elements Distribution of Nb-Si Based Composite

2019 ◽  
Vol 822 ◽  
pp. 617-627 ◽  
Author(s):  
I.S. Goncharov ◽  
Nikolay G. Razumov ◽  
Aleksey I. Shamshurin ◽  
Qing Sheng Wang
Keyword(s):  
Phase Composition ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Chemical Elements ◽  
X Ray Diffraction ◽  
Phase Constituent ◽  
Plasma Sintering ◽  
Particles Size Distribution ◽  
Spark Plasma

Synthesis of the Nb-Si in-situ composite was attempted by mechanical alloying of element powders in vario-planetary ball mill. The particles size distribution was measured by laser diffraction, microstructures were examined with scanning electronic microscope, and the phase constituent were analyzed by X-ray diffraction. The amorphization of the Si during mechanical alloying, large amount of deformation of Nb crystal structure, and after all – the formation of supersaturated solid solution of Nb was observed. To stabilize microstructure and phase composition, a spark plasma sintering was attempted. After SPS microstructure consist of three main phases – Nbss, Nb5Si3 and Nb3Si.

Effect of Aluminum on Fabrication of Ti3SiC2 by Mechanical Alloying and Spark Plasma Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 1065-1068
Author(s):  
Song Zhe Jin ◽  
Bao Yan Liang ◽  
Jing Feng Li ◽  
Li Li
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Purity ◽  
Trace Amount ◽  
High Energy ◽  
Alloyed Powder ◽  
Mechanically Alloyed ◽  
Starting Mixture ◽  
Plasma Sintering ◽  
Spark Plasma

In the present study, we fabricated high purity and electrically machinable Ti3SiC2 ceramics by mechanical alloying and subsequent spark plasma sintering. The effect of a trace amount of Al on these synthesis processes was examined. Our results showed that Ti3SiC2 could be synthesized by high energy milling. Spark plasma sintering of mechanically alloyed powder at the temperatures of 1000-1200°C produced nearly single-phased Ti3SiC2 materials. The purity of the sintered Ti3SiC2 bulk was remarkably increased by addition of a small amount of Al. Ti3SiC2 with a purity of 99.3 wt% and a relative density of 98.9% was obtained by mechanical alloying and subsequent spark plasma sintering from a starting mixture composed of n(Ti) : n(Si) : n(Al) : n(c) = 3 : 1 : 0.2 : 2 at 1100°C.

Synthesis of Nanocrystalline (W, Ti)C from Respective Elemental Powders by Mechanical Alloying and Spark Plasma Sintering

2011 ◽  
Vol 306-307 ◽  
pp. 1728-1734
Author(s):  
Jia Hong Liang ◽  
Chao Yang ◽  
Xiao Qiang Li ◽  
Sheng Guan Qu ◽  
Yuan Yuan Li
Keyword(s):  
Grain Size ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Amorphous Phase ◽  
Wet Milling ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Proposed Model ◽  
Spark Plasma ◽  
Milling Condition

The possibility of synthesizing nanocrystalline (W, Ti)C is investigated by spark plasma sintering of mechanically alloyed elemental mixed powders of W, Ti and C. The results show that wet-milling generates WxTi1-x instead of directly forming (W, Ti)C, and makes the graphite C transform into amorphous phase surrounding the formed WxTi1-x. Meanwhile, the grain size of the 70 h milled elemental mixed powders reaches about 50 nm under the wet-milling condition. Subsequently, nanocrystalline (W, Ti)C is successfully synthesized by spark plasma sintering of the 70 h milled elemental mixed powders. The formation of (W, Ti)C phase by SPS from the WxTi1-x and amorphous C generated by MA is simply explained based on our proposed model.

scholarly journals Mechanical and Tribological Behavior of Mechanically Alloyed Ni-TiC Composites Processed via Spark Plasma Sintering

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5306
Author(s):  
Ganesh Walunj ◽  
Anthony Bearden ◽  
Amit Patil ◽  
Taban Larimian ◽  
Jijo Christudasjustus ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Energy ◽  
Matrix Composites ◽  
Nickel Matrix ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
High Energy Ball Mill ◽  
Spark Plasma ◽  
Equilibrium Process

Titanium carbide (TiC) reinforced nickel (Ni) matrix composites were processed via mechanical alloying (MA) followed by spark plasma sintering (SPS) process. Mechanical alloying has gained special attention as a powerful non-equilibrium process for fabricating amorphous and nanocrystalline materials, whereas spark plasma sintering (SPS) is a unique technique for processing dense and near net shape bulk alloys with homogenous microstructure. TiC reinforcement varied from 5 to 50 wt.% into nickel matrix to investigate its effect on the microstructure and mechanical behavior of Ni-TiC composites. All Ni-TiC composites powder was mechanically alloyed using planetary high energy ball mill with 400 rpm and ball to powder ratio (BPR) 15:1 for 24 h. Bulk Ni-TiC composites were then sintered via SPS process at 50 MPa pressure and 900–1200 °C temperature. All Ni-TiC composites exhibited higher microhardness and compressive strength than pure nickel due to the presence of homogeneously distributed TiC particles within the nickel matrix, matrix grain refinement, and excellent interfacial bonding between nickel and TiC reinforcement. There is an increase in Ni-TiC composites microhardness with an increase in TiC reinforcement from 5 to 50 wt.%, and it reaches the maximum value of 900 HV for Ni-50TiC composites.

Bi2Te3 and Bi2Te3/Nano-SiC Prepared by Mechanical Alloying and Spark Plasma Sintering

2007 ◽  
Vol 280-283 ◽  
pp. 397-400 ◽  
Author(s):  
Jing Liu ◽  
Jing Feng Li
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Mechanical Alloying ◽  
Seebeck Coefficient ◽  
Spark Plasma Sintering ◽  
Thermoelectric Materials ◽  
Room Temperature ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Spark Plasma

Bi2Te3-based alloys are currently best-known, technological thermoelectric materials near room temperature. In this paper, Bi2Te3 and nano-SiC dispersed Bi2Te3 were prepared by mechanical alloying followed by spark plasma sintering (SPS). Raw powders of Bi, Te and SiC were mixed and mechanically alloyed in an argon atmosphere using a planetary ball mill. The SPS temperature was 623K, and the holding time was 5 minutes. The samples were characterized by X-ray Diffraction (XRD) and Scanning electron Microscope (SEM). The thermoelectric properties: i.e. Seebeck coefficient, electrical resistivity and thermal conductivity were measured at temperatures from room temperature to 573K, followed by the evaluation of figure of merit. The results revealed that the SiC dispersion in the Bi2Te3 matrix increased Seebeck coefficient. Although the electrical resistivity was increased somewhat, the thermal conductivity was reduced by the SiC dispersion, indicating that promising thermoelectric materials with enhanced mechanical properties may be obtained in the nano-SiC dispersed Bi2Te3 composites with optimal compositions.

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