TY  - JOUR
AU  - Dimčić, Biljana
AU  - Stašić, Jelena
AU  - Ružić, Jovana
AU  - Božić, Dušan
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1505
AB  - The influence of microstructure, heat treatment and alloying addition on mechanical and fracture properties of Ti3Al-based intermetallic at room and elevated temperatures was studied. Ti3Al-11Nb-1Mo (mole fraction, %) alloy was consolidated via powder metallurgy processing by mechanical alloying (MA) and hot pressing (HP). MA powders were characterized using XRD and SEM-EDS. Optimum MA duration was 25 h and HP conditions of 1350 degrees C, 2 h, 35 MPa. After HP, solution treatment at 1050 degrees C for 1 h and water quenching alpha(2)+beta WidmanstAtten microstructure is present, while subsequent aging at 800 degrees C during 24 h induces small content of O-phase. High fraction of beta-phase is a direct consequence of Mo. Compression tests were performed from room temperature to 750 degrees C in vacuum. The yield strength of compacts increases with temperature up to 250 degrees C (pyramidal slip systems activation), after which it decreases. Ductility increases throughout the whole temperature range. The presence of O phase contributed to ductility increase in aged alloys, while negligibly lowering yield strength. Registered drop in the yield strength of aged alloys compared with non-aged ones was mostly influenced by precipitation of a. 2 particles. Mixed fracture modes are operative at all temperatures.
T2  - Transactions of Nonferrous Metals Society of China
T1  - Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques
VL  - 27
IS  - 3
SP  - 527
EP  - 537
DO  - 10.1016/S1003-6326(17)60059-1
ER  - 

@article{
author = "Dimčić, Biljana and Stašić, Jelena and Ružić, Jovana and Božić, Dušan",
year = "2017",
abstract = "The influence of microstructure, heat treatment and alloying addition on mechanical and fracture properties of Ti3Al-based intermetallic at room and elevated temperatures was studied. Ti3Al-11Nb-1Mo (mole fraction, %) alloy was consolidated via powder metallurgy processing by mechanical alloying (MA) and hot pressing (HP). MA powders were characterized using XRD and SEM-EDS. Optimum MA duration was 25 h and HP conditions of 1350 degrees C, 2 h, 35 MPa. After HP, solution treatment at 1050 degrees C for 1 h and water quenching alpha(2)+beta WidmanstAtten microstructure is present, while subsequent aging at 800 degrees C during 24 h induces small content of O-phase. High fraction of beta-phase is a direct consequence of Mo. Compression tests were performed from room temperature to 750 degrees C in vacuum. The yield strength of compacts increases with temperature up to 250 degrees C (pyramidal slip systems activation), after which it decreases. Ductility increases throughout the whole temperature range. The presence of O phase contributed to ductility increase in aged alloys, while negligibly lowering yield strength. Registered drop in the yield strength of aged alloys compared with non-aged ones was mostly influenced by precipitation of a. 2 particles. Mixed fracture modes are operative at all temperatures.",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques",
volume = "27",
number = "3",
pages = "527-537",
doi = "10.1016/S1003-6326(17)60059-1"
}

Dimčić, B., Stašić, J., Ružić, J.,& Božić, D.. (2017). Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques. in Transactions of Nonferrous Metals Society of China, 27(3), 527-537.
https://doi.org/10.1016/S1003-6326(17)60059-1

Dimčić B, Stašić J, Ružić J, Božić D. Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques. in Transactions of Nonferrous Metals Society of China. 2017;27(3):527-537.
doi:10.1016/S1003-6326(17)60059-1 .

Dimčić, Biljana, Stašić, Jelena, Ružić, Jovana, Božić, Dušan, "Effect of synthesis parameters on structural and mechanical properties of Ti3Al-Nb-Mo intermetallic compound obtained by powder metallurgy techniques" in Transactions of Nonferrous Metals Society of China, 27, no. 3 (2017):527-537,
https://doi.org/10.1016/S1003-6326(17)60059-1 . .

TY  - JOUR
AU  - Dimčić, Biljana
AU  - Stašić, Jelena
AU  - Radić, Olivera
AU  - Božić, Dušan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5186
AB  - A comparative study of the microstructure, compressive properties, and fractography of Ti3Al and Ti3Al-Nb intermetallics produced via powder metallurgy and standard vacuum melting and casting processes has been carried out. Non-porous compacts were obtained via vacuum hot pressing of powders produced by mechanical alloying. Prior to compression tests, all samples were homogenized by a solution treatment at 1 050 degrees C (alpha + beta region), followed by water quenching. The compression tests were performed from room temperature to 500 degrees C in vacuum at a strain rate of 2.4 x 10(-3)s(-1). Detailed microstructural characterization was conducted using scanning electron microscopy, followed by energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Values of compressive mechanical properties of compacts were higher than those of castings. Fracture topography was examined by scanning electron microscopy. A correlation between ductility and the fracture mode exists for all materials.
T2  - International Journal of Materials Research
T1  - A comparative study of microstructure, compressive, and fracture properties of Ti3Al-based intermetallics produced via powder metallurgy, and melting and casting processes
VL  - 103
IS  - 11
SP  - 1325
EP  - 1331
DO  - 10.3139/146.110790
ER  - 

@article{
author = "Dimčić, Biljana and Stašić, Jelena and Radić, Olivera and Božić, Dušan",
year = "2012",
abstract = "A comparative study of the microstructure, compressive properties, and fractography of Ti3Al and Ti3Al-Nb intermetallics produced via powder metallurgy and standard vacuum melting and casting processes has been carried out. Non-porous compacts were obtained via vacuum hot pressing of powders produced by mechanical alloying. Prior to compression tests, all samples were homogenized by a solution treatment at 1 050 degrees C (alpha + beta region), followed by water quenching. The compression tests were performed from room temperature to 500 degrees C in vacuum at a strain rate of 2.4 x 10(-3)s(-1). Detailed microstructural characterization was conducted using scanning electron microscopy, followed by energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Values of compressive mechanical properties of compacts were higher than those of castings. Fracture topography was examined by scanning electron microscopy. A correlation between ductility and the fracture mode exists for all materials.",
journal = "International Journal of Materials Research",
title = "A comparative study of microstructure, compressive, and fracture properties of Ti3Al-based intermetallics produced via powder metallurgy, and melting and casting processes",
volume = "103",
number = "11",
pages = "1325-1331",
doi = "10.3139/146.110790"
}

Dimčić, B., Stašić, J., Radić, O.,& Božić, D.. (2012). A comparative study of microstructure, compressive, and fracture properties of Ti3Al-based intermetallics produced via powder metallurgy, and melting and casting processes. in International Journal of Materials Research, 103(11), 1325-1331.
https://doi.org/10.3139/146.110790

Dimčić B, Stašić J, Radić O, Božić D. A comparative study of microstructure, compressive, and fracture properties of Ti3Al-based intermetallics produced via powder metallurgy, and melting and casting processes. in International Journal of Materials Research. 2012;103(11):1325-1331.
doi:10.3139/146.110790 .

Dimčić, Biljana, Stašić, Jelena, Radić, Olivera, Božić, Dušan, "A comparative study of microstructure, compressive, and fracture properties of Ti3Al-based intermetallics produced via powder metallurgy, and melting and casting processes" in International Journal of Materials Research, 103, no. 11 (2012):1325-1331,
https://doi.org/10.3139/146.110790 . .