Effect of Sn on synthesis of nanocrystalline Ti-based alloy with fcc structure
Por:
Aguilar, C., Pio, E., Medina, A., Parra, C., Mangalaraja, R., Martin, P., Alfonso, I, Tello, K.
Publicada:
1 ago 2020
Resumen:
The effect of the amount of Sn on the formation of fcc phase in
Ti-13Ta-xSn (x=3, 6, 9 and 12, at.%) alloys was studied. The alloys
were synthesized by mechanical alloying using a planetary mill, jar and
balls of stabilized yttrium. Using Rietveld refinement, it was found
that the obtained fcc phase has crystallite size smaller than 10 nm and
microstrain larger than 10(-3). Both conditions are required to form an
fcc phase in Ti-based alloys. For all samples, the microstructure of the
fcc phase consists of equiaxial crystallites with sizes smaller than 10
nm. The largest presence of fcc phase in the studied Ti alloy was found
with 6 at.% Sn, because this alloy exhibits the largest microstrain
(1.5 x10(-2)) and crystallite size of 6.5 nm. Experimental data reveal
that a solid solution and an amorphous phase were formed during milling
The necessary conditions to promote the formation of solid solution and
amorphous phases were determined using thermodynamic calculations. When
the amount of Sn increases, the energy required to form an amorphous
phase varies from approximately 10 to approximately -5 kJ/mol for 3 and
12 at.% Sn, respectively. The thermodynamic calculations are in
agreement with XRD patterns analysis and HRTEM results.
Filiaciones:
Aguilar, C.:
(Corresponding Author), Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
Pio, E.:
Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
Medina, A.:
Univ Michoacana, Inst Invest Met & Mat, Morelia, Michoacan, Mexico
Parra, C.:
Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
Mangalaraja, R.:
Univ Concepcion, Dept Ingn Mat, Lab Ceram Avanzados & Nanotecnol, Concepcion, Chile
Martin, P.:
Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
Alfonso, I:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Campus Morelia UNAM, Morelia, Michoacan, Mexico
Tello, K.:
Univ Tecn Federico Santa Maria, Dept Fis, Dept Ingn Met & Mat, Valparaiso, Chile
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