Experimental Confirmation of Ni5Al3 Phase in Ni-Al Binary System by Diffusion Couple Technique

2011 ◽  
Vol 299-300 ◽  
pp. 224-227
Author(s):  
Chang Fa Li ◽  
Yu Ping Ren ◽  
Gao Wu Qin
Keyword(s):  
Binary System ◽  
Diffusion Couple ◽  
Equilibrium Phase ◽  
Solubility Range ◽  
Heat Treated ◽  
Diffusion Couple Technique ◽  
System Phase Diagram ◽  
Rich Side ◽  
System Phase ◽  
Phase Relationships

The equilibrium phase relationships and compositions of Ni - 51at.%Al/Ni - 26at.%Al diffusion couple heat treated at 650 °C for various times have been investigated by means of diffusion couple technique. Experimental results showed that Ni5Al3 phase was not only stable at 650 °C, but also had a large solubility range (45.3～40.6) at.% Al. The obtained relationships of NiAl/Ni5Al3 and Ni5Al3/Ni3Al are in accordance with the current generally accepted Ni-Al binary system phase diagram, but their composition ranges are quite different from the presently accepted one, that is, the the phase boundaries of NiAl / (Ni5Al3 + NiAl), (Ni5Al3 + NiAl) / Ni5Al3 and Ni5Al3 / (Ni3Al + Ni5Al3) significantly shift to the Al-rich side.

scholarly journals La-Ga BINARY SYSTEM PHASE DIAGRAM

1982 ◽  
Vol 31 (12) ◽  
pp. 55
Author(s):  
LU XUE-SHAN ◽  
XIE SI-SHEN ◽  
LIANG JING-KUI
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
System Phase Diagram ◽  
System Phase

Steady-State Dynamic Phase Diagram Calculation of U-Ti and U-V Binary System under Irradiation

2020 ◽  
Vol 993 ◽  
pp. 996-1003
Author(s):  
Yong Lu ◽  
Zheng Jiang ◽  
Qiao Qiao Tang ◽  
Cui Ping Wang ◽  
Xing Jun Liu
Keyword(s):  
Phase Diagram ◽  
Steady State ◽  
Binary System ◽  
Low Temperature ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Enhanced Diffusion ◽  
Dynamical Phase ◽  
Irradiation Intensity ◽  
Phase Relationships

In this paper, by considering the irradiation-enhanced diffusion, a combination of effective free energy model and the thermodynamic model was used for studying the phase relationships in the U-Ti and U-V binary system under irradiation. The steady-state dynamical phase diagrams of U-Ti and U-V binary alloys under different irradiation intensities were calculated and compared with the conventional thermodynamic equilibrium phase diagram. The calculated results show that under irradiation the high-temperature stable (βTi, γU) and (γU,V) phases were stabilized at relatively low temperature resulting in invariant reactions at relatively low temperature. In addition, with the increase of the irradiation intensity, the temperature of the invariant reactions increased, and the phase regions of the (βTi, γU) and (γU,V) also increased.

The Effect of Ti Addition on Phase Equilibria among Ni (A1), Ni3Al (L12) and Ni3V (D022) Phases

2010 ◽  
Vol 654-656 ◽  
pp. 432-435 ◽  
Author(s):  
Eiki Hayashi ◽  
Satoru Kobayashi ◽  
Kazuhisa Sato ◽  
Toyohiko J. Konno ◽  
Yasuyuki Kaneno ◽  
...  
Keyword(s):  
Binary System ◽  
Ternary System ◽  
Phase Equilibria ◽  
Eutectoid Reaction ◽  
Eds Analysis ◽  
Heat Treated ◽  
Three Phase ◽  
Rich Side ◽  
Ti Addition

The effect of Ti addition on phase equilibria among Ni (A1), Ni3Al (L12) and Ni3V (D022) phases at 950 °C was investigated through TEM/EDS analysis on heat-treated alloys. The three-phase coexisting region of A1 + L12 + D022 was found to exist around the composition of Ni-4Al-19V (at. %) in the Ni-Al-V ternary system. With addition of Ti to the ternary system the three-phase coexisting region was shifted to the Ni-rich side. Ti partitioned most into the L12 phase and least into the A1 phase. These results suggest that the addition of Ti stabilizes the L12 and D022 phases against A1 phase, and raises the temperature of eutectoid reaction in the Ni3Al-Ni3V pseudo-binary system: A1 → L12 + D022.

Thermodynamic simulation of the Ni—Ru binary-system phase diagram

1999 ◽  
Vol 38 (5-6) ◽  
pp. 254-260 ◽  
Author(s):  
V. M. Danilenko ◽  
T. Ya. Velikanova ◽  
T. G. Mazhuga ◽  
O. I. Dovbenko ◽  
O. L. Semenova
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Thermodynamic Simulation ◽  
System Phase Diagram ◽  
System Phase

Microtwinning Evidence For The Apparent Five-Fold Symmetry in T2(Al6Li3Cu)

1987 ◽  
Vol 45 ◽  
pp. 24-25
Author(s):  
Kenneth S. Vecchio ◽  
David B. Williams
Keyword(s):  
Stable Equilibrium ◽  
Equilibrium Phase ◽  
Convergent Beam Electron Diffraction ◽  
Icosahedral Structure ◽  
Cubic Crystals ◽  
Icosahedral Phases ◽  
Heat Treated ◽  
Zero Layer ◽  
Convergent Beam ◽  
Zr Alloy

Since the discovery in 1984 by Shechtman et al. of crystals which display apparent five-fold symmetry, extensive effort has been given to establishing a theoretical basis for the existence of icosahedral phases (eg.2.). Several other investigations have been centered on explaining these observations based on twinning of cubic crystals (eg.3.). Recently, the existence of a stable, equilibrium phase T2Al6 Li3Cu) possessing an icosahedral structure has been reported in the Al-Li-Cu system(4-6).In the present study an Al-2.6wt.%Li-l.5wt.%Cu-0.lwt.%Zr alloy was heat treated at 300°C for 100hrs. to produce large T2 precipitates. Convergent Beam Electron Diffraction (CBED) patterns were obtained from two-fold, three-fold, and apparent five-fold axes of T2 particles. Figure 1 shows the five-fold symmetric zero layer CBED pattern obtained from T2 particles.

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