Initial stage densification during spark plasma sintering of Fe-based amorphous alloy powder: Analysis of viscous flow

2016 ◽  
Vol 120 (13) ◽  
pp. 134901 ◽  
Author(s):  
Tanaji Paul ◽  
Sandip P. Harimkar
Keyword(s):  
Amorphous Alloy ◽  
Viscous Flow ◽  
Spark Plasma Sintering ◽  
Alloy Powder ◽  
Plasma Sintering ◽  
Initial Stage ◽  
Spark Plasma ◽  
Amorphous Alloy Powder ◽  
Powder Analysis

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.

Microstructure and mechanical properties of Cu-based bulk amorphous alloy billets fabricated by spark plasma sintering

2005 ◽  
Vol 406 (1-2) ◽  
pp. 293-299 ◽  
Author(s):  
Chang Kyu Kim ◽  
Han Sang Lee ◽  
Seung Yong Shin ◽  
Jae Chul Lee ◽  
Do Hyang Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Amorphous Alloy ◽  
Spark Plasma Sintering ◽  
Bulk Amorphous Alloy ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma

Kinetics Model for the Initial Stage of Spark Plasma Sintering

2007 ◽  
Vol 336-338 ◽  
pp. 2366-2368 ◽  
Author(s):  
Ming Hao Fang ◽  
Wei Pan ◽  
Sui Lin Shi ◽  
Zhen Yi Fang
Keyword(s):  
Spark Plasma Sintering ◽  
Kinetics Model ◽  
Shrinkage Ratio ◽  
Sintering Kinetics ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Initial Stage ◽  
Spark Plasma ◽  
Powder Particles ◽  
The Relationship

The sintering kinetics model of initial stage by spark plasma sintering (SPS) is discussed in this paper. During SPS, there are discharges among the powder particles. And the particles surface will be melted and form viscose flow. These phenomena accelerate the particles rearrangement and reduce the sintering time. The relationship between the shrinkage ratio of particles and the sintering time during the initial stages of sintering by SPS has been obtained. The results show that L/L0 is linear to the time.

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