The internal oxidation of two-phase binary alloys under low oxidant pressures

1996 ◽  
Vol 45 (1-2) ◽  
pp. 51-76 ◽  
Author(s):  
Francesco Gesmundo ◽  
Furio Viani ◽  
Yan Niu
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys ◽  
Two Phase ◽  
Low Oxidant Pressures

Possible scaling modes in high-temperature oxidation of two-phase binary alloys. II: Low oxidant pressures

1995 ◽  
Vol 43 (3-4) ◽  
pp. 379-394 ◽  
Author(s):  
F. Gesmundo ◽  
Y. Niu ◽  
F. Viani
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Binary Alloys ◽  
Two Phase ◽  
Temperature Oxidation ◽  
Low Oxidant Pressures

The internal oxidation of two-phase binary alloys beneath an external scale of the less-stable oxide

1997 ◽  
Vol 47 (3-4) ◽  
pp. 355-380 ◽  
Author(s):  
F. Gesmundo ◽  
F. Viani ◽  
Y. Niu
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys ◽  
External Scale ◽  
Two Phase ◽  
Stable Oxide

The steady-State corrosion kinetics of two-phase binary alloys forming the most-stable oxide

1996 ◽  
Vol 46 (5-6) ◽  
pp. 383-398 ◽  
Author(s):  
F. Gesmundo ◽  
P. Castello ◽  
F. Viani
Keyword(s):  
Steady State ◽  
Binary Alloys ◽  
Two Phase ◽  
Stable Oxide ◽  
Corrosion Kinetics ◽  
Kinetics Of

Heat Capacity in Two-Phase Regions and Heat of Phase Transformations of Certain Zr-Nb Binary Alloys

Atomic Energy ◽  
2005 ◽  
Vol 99 (1) ◽  
pp. 451-463 ◽  
Author(s):  
S. G. Popov ◽  
V. N. Proselkov
Keyword(s):  
Heat Capacity ◽  
Phase Transformations ◽  
Binary Alloys ◽  
Two Phase

Numerical Model to Describe the Growth of the Internal Oxidation Layer in Binary Alloys

2006 ◽  
pp. 282-287
Author(s):  
Gabriel Plascencia ◽  
Torstein A. Utigard ◽  
Juliana Gutiérrez ◽  
David Jaramillo ◽  
Fernando Martínez
Keyword(s):  
Numerical Model ◽  
Internal Oxidation ◽  
Binary Alloys ◽  
Oxidation Layer

High-Temperature Materials Based on Quaternary Ir-Nb-Ni-Al Alloys

2000 ◽  
Vol 646 ◽  
Author(s):  
X. Yu ◽  
Y. Yamabe-Mitarai ◽  
Y. Ro ◽  
S. Nakaza ◽  
H. Harada
Keyword(s):  
Coherent Structures ◽  
Binary Alloys ◽  
Lattice Misfit ◽  
Al Alloys ◽  
Quaternary Alloys ◽  
Rich Region ◽  
Two Phase ◽  
High Temperature Materials ◽  
Novel Method ◽  
Potential Use

ABSTRACTA novel method to develop new quaternary alloys with an fcc/L12 coherent structure is proposed. This paper reviews the development of quaternary Ir-Nb-Ni-Al alloys. The microstructure, lattice misfit, and compressive 0.2% flow stress of 15 kinds of alloys were investigated systematically. Two kinds of coherent structures, fcc/L12-Ir3Nb and fcc/ L12-Ni3Al, were observed in most alloys. Two two-phase structures, fcc+L12-Ir3Nb and fcc+L12-Ni3Al, were observed in Ir-rich and Ni-rich regions, respectively. The lattice misfits of quaternary Ir-Nb-Ni-Al alloys were higher than those of Ni- or Ir-base binary alloys. The compressive 0.2% flow stresses of quaternary alloys increased dramatically compared with those of Ni-base superalloys. The quaternary alloys located in the Ir-rich region were not only had higher strength but also better ductility than Ir-base binary alloys. The potential use of quaternary alloys is discussed.

Search for Nucleation of Phase Embryos in Binary Alloys by Impurity Atoms

2000 ◽  
Vol 55 (1-2) ◽  
pp. 129-133
Author(s):  
Gary S. Collins ◽  
Luke S.-J. Peng ◽  
Matthew O. Zacate
Keyword(s):  
Gamma Rays ◽  
Driving Force ◽  
Perturbed Angular Correlation ◽  
Binary Alloys ◽  
Alloy System ◽  
Two Phase ◽  
Impurity Atoms ◽  
Quadrupole Interactions ◽  
Phase Domain ◽  
Crystal Phases

A search was made to detect the possibility that individual impurity atoms in two-phase, binary alloys nucleate embryonic crystals. The alloy system studied was Ni-Al and the impurities were 111ln probe atoms. Local surroundings of the probes characteristic of the crystal phases were detected through quadrupole interactions with 111Cd daughter nuclei using the method of perturbed angular correlation of gamma rays. Analysis of site fractions of the probes led to two alternative interpretations that could not be distinguished on the basis of the present measurements: 1.) 111ln probes in the two-phase domain between Ni2Al3 and NiAl segregate to Ni2Al3 with a segregation energy of about 0.10 eV; or 2.) 111ln probes nucleate embryonic crystals of Ni2Al3, with the driving force for nucleation being an attraction between In atoms and Ni vacancies that is known to be strong in NiAl.

XANES Analysis of BCC/FCC Two-Phase Binary Alloys

1999 ◽  
Vol 590 ◽  
Author(s):  
P.J. Schilling ◽  
R.C. Tittsworth ◽  
E. Ma ◽  
J.-H. He
Keyword(s):  
Ball Milling ◽  
Binary Alloys ◽  
Critical Factor ◽  
High Energy ◽  
X Ray Diffraction ◽  
Two Phase ◽  
Edge Structure ◽  
X Ray ◽  
Energy Ball ◽  
A New Technique

ABSTRACTA critical factor in the characterization of two-phase binary alloy systems is the determination of the phase fractions and compositions of the two coexisting solid solutions for any given overall composition of the two-phase mixture. In some systems, for example nanocrystalline alloys formed by high-energy ball-milling, these parameters are difficult to attain by traditional techniques like x-ray diffraction. A new technique has been developed to obtain these quantities indirectly from x-ray absorption near edge structure (XANES) data collected at the two relevant absorption edges, with the formulation of this technique presented here in detail. The technique has been tested using Fe-Ni fcc and bcc standards and the results indicate that the method is accurate to within 5%. This method has been applied to two-phase (f.c.c. and b.c.c.) binary alloys formed by ball-milling of Cu100-xFex(x = 50-80).

The Criterion for the Onset of Internal Oxidation Beneath the External Scales on Binary Alloys

1978 ◽  
Vol 125 (7) ◽  
pp. 1116-1126 ◽  
Author(s):  
W. W. Smeltzer ◽  
D. P. Whittle
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys
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