Hot Working of Ti Aluminide Made through Reaction Synthesis

2012 ◽  
Vol 710 ◽  
pp. 137-142
Author(s):  
Rohit Kumar Gupta ◽  
Bhanu Pant ◽  
Vijaya Agarwala ◽  
Parameshwar Prasad Sinha
Keyword(s):  
Microstructure Evolution ◽  
Titanium Aluminide ◽  
Hot Isostatic Pressing ◽  
Hot Working ◽  
Reaction Synthesis ◽  
Refined Grains ◽  
Isostatic Pressing ◽  
Die Forging ◽  
Open Die Forging

Hot working of titanium aluminide made through reaction synthesis (RS) has been studied. Hot isostatic pressing under argon, isothermal pressing under vacuum, open die forging and pack forging was carried out. Hot worked billet samples were characterized for density and microstructure evolution. Presence of refined grains and dynamically recrystallized grains were observed. In case of open die forging, presence of twins was also found. From the present study, near isothermal working through near conventional processes has been confirmed. However, role of isothermal working in obtaining crack free sound deformed product has also been noted.

Effect of Ti Particle Size on Reaction Synthesis of Ti Aluminide

2012 ◽  
Vol 710 ◽  
pp. 314-319 ◽  
Author(s):  
Rohit Kumar Gupta ◽  
Bhanu Pant ◽  
Vijaya Agarwala ◽  
Parameshwar Prasad Sinha
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Titanium Aluminide ◽  
Reaction Synthesis ◽  
Particle Sizes ◽  
Minor Phase ◽  
Chemical Homogeneity ◽  
Major Phase ◽  
Ti Powder

Titanium aluminide intermetallic was made through reaction synthesis (RS) process using elemental powders. Pressure assisted synthesis was carried out at high temperature under vacuum. Ti powder with two different particle sizes (200μm and 30μm average) were used in RS. Synthesized blocks were homogenized and characterized for chemical homogeneity, density, phase formation and microstructure evolution. Products near to theoretical density have been obtained with uniform chemistry after homogenization. Al3Ti as a major phase along with TiAl as minor phase was confirmed after RS and TiAl along with Ti3Al was observed after homogenization. Homogenization cycle was found to be different for the alloys made through different Ti particle sizes. Significant role of Ti particle size has been observed in this pressure assisted RS process.

scholarly journals Fabrication of Highly Transparent Y2O3 Ceramics with CaO as Sintering Aid

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 444
Author(s):  
Danlei Yin ◽  
Jun Wang ◽  
Meng Ni ◽  
Peng Liu ◽  
Zhili Dong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Microstructure Evolution ◽  
Hot Isostatic Pressing ◽  
Optical Transmittance ◽  
Densification Rate ◽  
Vacuum Sintering ◽  
Sintering Aid ◽  
Isostatic Pressing

Highly transparent Y2O3 ceramics were successfully fabricated with CaO as sintering aid. The microstructure evolution, optical transmittance, hardness and thermal conductivity of the Y2O3 ceramics were investigated. It was found that doping a small amount (0.01–0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

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