Quantitative phase analysis in Al86Ni8Y6 bulk glassy alloy synthesized by consolidating mechanically alloyed amorphous powder via spark plasma sintering

2016 ◽  
Vol 93 ◽  
pp. 96-103 ◽  
Author(s):  
Ram S. Maurya ◽  
Ashutosh Sahu ◽  
Tapas Laha
Keyword(s):  
Spark Plasma Sintering ◽  
Phase Analysis ◽  
Glassy Alloy ◽  
Amorphous Powder ◽  
Quantitative Phase Analysis ◽  
Mechanically Alloyed ◽  
Quantitative Phase ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Bulk Glassy Alloy

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.

The Crystal Growth of Ti50Cu23Ni20Sn7 during the SPS Process

2012 ◽  
Vol 428 ◽  
pp. 190-195 ◽  
Author(s):  
Qiang Li ◽  
Yu Ying Zhu ◽  
Yun Hua He ◽  
Ge Wang ◽  
Xing Hua Wang
Keyword(s):  
Glass Transition ◽  
Amorphous Alloy ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Amorphous Powder ◽  
High Energy ◽  
Bulk Amorphous Alloy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Amorphous Alloy Powder

Ti50Cu23Ni20Sn7 bulk amorphous alloy was prepared by mechanical alloying and spark plasma sintering. The milling was performed in a high-energy planetary ball mill. XRD showed that after milled 35h, fully amorphous powders can be obtained, under the condition of the milling speed, 300rpm, and the weighs ratio of ball to powder, 20:1. Thermal stability of the as-milled amorphous powder was determined by DSC at the heating rate of 40K/min. The glass transition Tg and the initial crystallization temperature Tx1 was 746K and 782K, respectively. Then, the obtained amorphous alloy powder was compacted by spark plasma sintering at the temperature of 753K, 763K, 773K, 783K and 793K under the compress of 500Mpa. Crystal structure and the morphology of the sintered samples were investigated by XRD and SEM, respectively. When sintered near the glass transition temperature, the SPS sintered samples remained complete amorphous, crystalline peak did not appear in the XRD curves. As the sintering temperature increased, the crystalline phases in the sample began to increase. It was shown that when sintered at 753K and 763K, the samples had fewer defects, and it was completely amorphous alloy. When the sintering temperature increased to 773K, more defects appeared, including point-like defects and disc-shaped defects. The disc-shaped defect was widespread in the specimens sintered at 783K and 793K.

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.

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