High strength Ti-6Al-4V alloy fabricated by high-energy cube milling using calcium as process control agent (PCA) and spark plasma sintering

2017 ◽  
Vol 93 (1-4) ◽  
pp. 445-453 ◽  
Author(s):  
N. Kishore Babu ◽  
Kaspar Kallip ◽  
Marc Leparoux ◽  
Khaled A. AlOgab ◽  
M.K. Talari ◽  
...  
Keyword(s):  
Process Control ◽  
Spark Plasma Sintering ◽  
High Strength ◽  
High Energy ◽  
Control Agent ◽  
Process Control Agent ◽  
Plasma Sintering ◽  
Spark Plasma

Densification of γ-TiAl Powders by Spark Plasma Sintering

2012 ◽  
Vol 710 ◽  
pp. 303-307
Author(s):  
Sarangapani Kennedy ◽  
S. Kumaran ◽  
T. Srinivasa Rao
Keyword(s):  
Spark Plasma Sintering ◽  
High Strength ◽  
Linear Shrinkage ◽  
High Energy ◽  
Tial Alloys ◽  
Suitable Material ◽  
Good Oxidation Resistance ◽  
Plasma Sintering ◽  
Structural Applications ◽  
Spark Plasma

The superior thermo-physical properties of γ–TiAl alloys like low density, good oxidation resistance and high strength retention at elevated temperature makes it a suitable material for high temperature structural applications. However they have poor low temperature ductility and poor creep resistance at service temperatures. It is expected that nanocrystalline γ–TiAl alloys can overcome this difficulty with improved mechanical properties. Spark plasma sintering (SPS), one of the novel powder metallurgy techniques offers the advantage of manufacturing nanostructured materials. The present paper reports on the basic investigation of densification behaviour of nanostructured γ–TiAl alloy consolidated by spark plasma sintering. As received prealloyed γ–TiAl powder was milled in a high energy ball mill with optimized parameters for 20 and 40 hours. The structural transformations of these powders were studied by X-ray diffraction (XRD) and electron microscopy (SEM). These milled powders as well as unmilled powders were consolidated by spark plasma sintering with varying temperature. The density of these sintered samples was measured by Archimedes principle. The density of spark plasma sintered samples were 92%, 96% and 98% for unmilled, 20hrs and 40hrs, respectively. The densification behavior of these powders with respect to temperature has been studied by measuring the instantaneous linear shrinkage of the specimen that was indicated by the z-axis displacement. It was observed that 60% of densification occurred at temperature range of 700-1000°C .

Al-SiC Nanocomposites Produced by Ball Milling and Spark Plasma Sintering

2013 ◽  
Vol 1513 ◽  
Author(s):  
R.C. Picu ◽  
J.J. Gracio ◽  
G.T. Vincze ◽  
N. Mathew ◽  
T. Schubert ◽  
...  
Keyword(s):  
Yield Stress ◽  
Ball Milling ◽  
Spark Plasma Sintering ◽  
High Energy ◽  
Sic Nanoparticles ◽  
Sic Particles ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Ball ◽  
Annealing Experiments

ABSTRACTIn this work Al-SiC nanocomposites were prepared by high energy ball milling followed by spark plasma sintering of the powder. For this purpose Al micro-powder was mixed with 50 nm diameter SiC nanoparticles. The final composites had grains of approximately 100 nm dimensions, with SiC particles located mostly at grain boundaries. To characterize their mechanical behavior, uniaxial compression, micro- and nano-indentation were performed. Materials with 1vol% SiC as well as nanocrystalline Al produced by the same means with the composite were processed, tested and compared. AA1050 was also considered for reference. It was concluded that the yield stress of the nanocomposite with 1 vol% SiC is 10 times larger than that of regular pure Al (AA1050). Nanocrystalline Al without SiC and processed by the same method has a yield stress 7 times larger than AA1050. Therefore, the largest increase is due to the formation of nanograins, with the SiC particles’ role being primarily that of stabilizing the grains. This was demonstrated by performing annealing experiments at 150°C and 250°C for 2h, in separate experiments.

Microstructure and properties of Cu-10 wt.% Al bronze obtained by high-energy mechanical milling and spark plasma sintering

2022 ◽  
pp. 131671
Author(s):  
Dina V. Dudina ◽  
Tatyana F. Grigoreva ◽  
Vyacheslav I. Kvashnin ◽  
Evgeniya T. Devyatkina ◽  
Sergey V. Vosmerikov ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Mechanical Milling ◽  
High Energy ◽  
Microstructure And Properties ◽  
Plasma Sintering ◽  
Spark Plasma
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