Synthesizing and Characterizing of a Novel Zr90Ni6Pd4 Bulk Metallic Glassy Alloy Obtained by Spark Plasma Sintering of Mechanically Alloyed Powders

2016 ◽  
Vol 5 (4) ◽  
Author(s):  
El Eskandarany MS
Keyword(s):  
Spark Plasma Sintering ◽  
Glassy Alloy ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Crystallization Kinetics and Consolidation of Al82La10Fe4Ni4 Glassy Alloy Powder by Spark Plasma Sintering

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 812
Author(s):  
Nguyen Viet ◽  
Nguyen Oanh ◽  
Ji-Soon Kim ◽  
Alberto Jorge
Keyword(s):  
Nucleation Rate ◽  
Glassy Alloy ◽  
Intermetallic Phase ◽  
Three Dimensional ◽  
Sample Surface ◽  
Sintered Sample ◽  
Amorphous Structure ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Spark Plasma

The mechanically alloyed Al82La10Ni4Fe4 glassy powder displays a two-step devitrification characterized by the precipitation of fcc-Al together with small amounts of the intermetallic Al11La3 phase in the first crystallization. The interface-controlled growth mechanism governed the first crystallization event. Calculations of the activation energy, using the methods of Kissinger, Ozawa, and Augis-Bennett gave values of 432.33, 443.2, and 437.76 kJ/mol, respectively. The calculated Avrami exponent (n) for the first crystallization peak was about 1.41, suggesting an almost zero nucleation rate. On the other hand, the value of n for the second peak related to the residual amorphous phase completely transformed into the intermetallic phase Al11La3 was about 3.61, characterizing diffusion controlled three-dimensional crystal growth with an increasing nucleation rate. Samples sintered at 573 K kept an amorphous structure and exhibited a high compressive strength of 650 MPa with a maximum elongation of 2.34% without any plastic deformation. The failure morphology of the sintered sample surface presented a transparticle fracture mechanism, indicating the efficiency of the sintering processing.

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.

Densification and Mechanical Property of Nanostructured NiAl Produced by Mechanical-Alloying and Spark-Plasma Sintering

2004 ◽  
Vol 449-452 ◽  
pp. 1101-1104 ◽  
Author(s):  
Ji Soon Kim ◽  
S.-H. Jung ◽  
Young Do Kim ◽  
Chung Hyo Lee ◽  
Young Soon Kwon
Keyword(s):  
Mechanical Property ◽  
Crystallite Size ◽  
Spark Plasma Sintering ◽  
Bending Strength ◽  
Rupture Strength ◽  
Mechanically Alloyed ◽  
Plasma Sintering ◽  
Nial Phase ◽  
Ni3al Phase ◽  
Spark Plasma

Mechanically-alloyed NiAl powder was sintered by Spark-Plasma Sintering (SPS) process. Densification behavior and mechanical property were determined. Above 97% relative density was obtained after sintering at 1150oC for 5min. Crystallite size determined by the Scherrer method was approximately 80 nm. TEM observation revealed a relative larger crystallite size. X-ray diffraction analysis showed that the sintered bodies were composed mainly of NiAl phase together with Ni3Al phase. Sintered NiAl body showed an average Vicker’s hardness of 555Hv, transverse-rupture strength of 1393MPa, 4-point-bending strength of 1100MPa, and fracture toughness of 19.9MPa m-1/2

Consolidation Behavior of Cu-Zr-Al Metallic Glass Powder by Spark Plasma Sintering

2010 ◽  
Vol 654-656 ◽  
pp. 1086-1089 ◽  
Author(s):  
Guo Qiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Mikio Fukuhara ◽  
Hisamichi Kimura ◽  
Akihisa Inoue
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Glassy Alloy ◽  
High Strength ◽  
Alloy System ◽  
Full Density ◽  
Large Size ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Consolidation Behavior

We investigated consolidation behavior of gas-atomized Cu50Zr45Al5 metallic glassy alloy powders by a spark plasma sintering (SPS) process. Density of the sintered samples increased with an increase in sintering temperature. The nearly full density samples without crystallization could be attained by the SPS process at sintering temperature of 693 K under pressure of 600 MPa. The produced samples exhibited high-strength and met large-size requirement. The SPS process makes it possible to fabricate the large-size bulk metallic glasses without limitation of dimensions and alloy system.

Fabrication of Ni52.5Nb10Zr15Ti15Pt7.5 Bulk Metallic Glassy Matrix Composite Containing Dispersed ZrO2 Particulates by Spark Plasma Sintering

2007 ◽  
Vol 561-565 ◽  
pp. 1291-1294 ◽  
Author(s):  
Guo Qiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Hisamichi Kimura ◽  
Fumihiro Wakai ◽  
Akihisa Inoue
Keyword(s):  
Spark Plasma Sintering ◽  
Matrix Composite ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
Glassy Matrix ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma ◽  
Rapid Sintering

Spark plasma sintering (SPS), as a developed rapid sintering technique, has a great potential for producing larger metallic glassy alloy specimens in a variety of shapes than those fabricated by casting methods, and can readily produce composites by dispersing crystalline particles in the glassy matrix. In this study, the Ni52.5Nb10Zr15Ti15Pt7.5 bulk metallic glassy matrix composites dispersed homogeneously with ceramics ZrO2 particulates were fabricated by the SPS process. The plastic ductility of the Ni52.5Nb10Zr15Ti15Pt7.5 glassy matrix composites was improved by adding ZrO2 particulates into the glassy alloy. The matrix of the fabricated composites maintained a glassy phase after the SPS process.

Effect of DC Pulse Patterns on Spark Plasma Sintering Process of [Fe0.8Co0.2B0.05Si0.2]96Nb4 Bulk Metallic Glass

2016 ◽  
Vol 849 ◽  
pp. 28-33
Author(s):  
Yue Ting Sun ◽  
Hui Liang Shao ◽  
Zhan Kui Zhao
Keyword(s):  
Spark Plasma Sintering ◽  
Glassy Alloy ◽  
Vital Role ◽  
Coordination Mechanism ◽  
Duty Ratio ◽  
Glassy Matrix ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Amorphous Alloy Powder

The influence of direct current pulse on–off patterns on spark plasma sintering of [Fe0.8Co0.2B0.05Si0.2]96Nb4 on kinetics competition and coordination mechanism of the interface bonding and crystallization has been investigated systematically. No crystallization of metallic glassy matrix and good bonding state between the particles were responsible for good mechanical properties of the fabricated Fe-based bulk glassy alloy at 2:9 (on: off) pattern. The higher local micro area’s instantaneous power and larger cooling time caused by low pulse duty ratio played a vital role in consolidation of amorphous alloy powder and desired structural properties.

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