Effect of Cr Content on Microstructure and Growth of External Al2O3 Scale Formed on Fe–Cr–Al Alloys

2021 ◽  
Author(s):  
Suzue Yoneda ◽  
Shigenari Hayashi
Keyword(s):  
Al Alloys ◽  
Al2o3 Scale ◽  
Cr Content

Promotion of the Al2O3-Scale Formation on Ni–Cr–Al Alloys via the Fluorine Effect

2015 ◽  
Vol 83 (3-4) ◽  
pp. 335-349 ◽  
Author(s):  
H.-E. Zschau ◽  
W. Zhao ◽  
S. Neve ◽  
B. Gleeson ◽  
M. Schütze
Keyword(s):  
Al Alloys ◽  
Scale Formation ◽  
Al2o3 Scale

Alloying Effect on the Microstructure and Property of Single Crystal Ni3Al Alloys

1988 ◽  
Vol 133 ◽  
Author(s):  
Zhang Jishan ◽  
Zhang Zhiya ◽  
Tang Yajun ◽  
Zhang Jinghua ◽  
Yu Yang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Al Alloys ◽  
Nickel Base Superalloy ◽  
Al Alloy ◽  
Alloying Effect ◽  
Temperature Range ◽  
Cr Content ◽  
Nickel Base ◽  
Alloying Effects ◽  
Base Superalloy

ABSTRACTThe alloying effects of Cr, Zr, Ta, Nb and B on the microstructure and properties of single crystal Ni3Al alloys have been studied. The strength of the alloys has been improved markedly with promising plasticity. The 0.2% yield stress of some of these alloys is higher than that of IN713C, a typical cast nickel-base superalloy, in the temperature range from 25 to 950°C and some of them reach the strength level of advanced cast nickel-base alloys such as IN100 in the high temperature range. The creep strength of these alloys is also improved markedly. The single crystal Ni3Al alloy with a high Cr content ( 7 at-%) obviously shows an intermediate temperature low plasticity behavior. Although heat treatment can only slightly improve the strength, it can double the elongation of the alloy from 25% to 50%. In the Ni3Al monocrystal containing 1.2at%Zr there exist great amounts of the low melting point Ni5 Zr-γ eutectics around the ordinary γ/γ′ eutectics. This makes it difficult to homogenize the coarse casting structures completely.

Protection of Fe-Cr-Al alloys in sulfidizing environments by means of an ?-Al2O3 scale

1982 ◽  
Vol 17 (5-6) ◽  
pp. 315-328 ◽  
Author(s):  
P. A. Mari ◽  
J. M. Chaix ◽  
J. P. Larpin
Keyword(s):  
Al Alloys ◽  
Al2o3 Scale

The Transition from Transient Oxide to Protective Al2O3 Scale on Fe–Cr–Al Alloys During Heating to 1000 °C

2017 ◽  
Vol 89 (1-2) ◽  
pp. 81-97 ◽  
Author(s):  
Suzue Yoneda ◽  
Shigenari Hayashi ◽  
Shigeharu Ukai
Keyword(s):  
Al Alloys ◽  
Al2o3 Scale

Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys

2016 ◽  
Vol 86 (1-2) ◽  
pp. 151-164 ◽  
Author(s):  
Shigenari Hayashi ◽  
Yuto Takada ◽  
Suzue Yoneda ◽  
Shigeharu Ukai
Keyword(s):  
Phase Transformation ◽  
Al Alloys ◽  
Stable Phase ◽  
Al2o3 Scale ◽  
Transformation Behavior ◽  
Phase Transformation Behavior

The Effect of Additional Elements on Oxide Scale Evolution of Fe-20at.%Cr-10at.%Al Alloy at 900 °C in Air

2008 ◽  
Vol 595-598 ◽  
pp. 1013-1021 ◽  
Author(s):  
Yuri Kitajima ◽  
Shigenari Hayashi ◽  
Shigeharu Ukai ◽  
Toshio Narita
Keyword(s):  
Growth Behavior ◽  
Al Alloys ◽  
Al Alloy ◽  
Al2o3 Scale ◽  
Scale Spallation ◽  
Additional Element ◽  
Outward Diffusion ◽  
Fecral Alloy ◽  
Element Addition ◽  
Scale Evolution

The oxidation behavior of Fe-20at.%Cr-10at.%Al alloys with a small amount of an additional element such as W, Cu, Mn, Nb, Mo, Re, Co or Ti was investigated at 900 °C for up to 625hr. The fourth element addition to the FeCrAl alloy could be classified into two groups; elements (Mn, Nb, Ti) that are contained in the Al2O3 scale, and elements (W, Mo, Re, Co) which are not present in the scale. In the latter case, the elements (W, Cu) caused scale spallation. The rumpling of alloys with Mn, Nb or Ti was smaller than that of the other alloys. The surface of the alloy with Ti was the smooth. Pt marker experiments suggested that the Al2O3 scale formed on the alloy with Ti grew by inward diffusion of O, whilst the Al2O3 scale formed on the FeCrAl alloy grew by both outward diffusion of Al and inward diffusion of O. This different growth behavior due to the elements incorporated in the Al2O3 scale could have an effect on the surface rumpling behavior.

Observation of faint contrast at planar faults in alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 340-341
Author(s):  
K. Kuroda ◽  
Y. Tomokiyo ◽  
T. Kumano ◽  
T. Eguchi
Keyword(s):  
Reciprocal Lattice ◽  
Beam Theory ◽  
Al Alloys ◽  
Small Displacement ◽  
Electron Microscopic ◽  
Lattice Vector ◽  
Fringe Contrast ◽  
Planar Fault ◽  
Lattice Displacement ◽  
The Many

The contrast in electron microscopic images of planar faults in a crystal is characterized by a phase factor , where is the reciprocal lattice vector of the operating reflection, and the lattice displacement due to the fault under consideration. Within the two-beam theory a planar fault with an integer value of is invisible, but a detectable contrast is expected when the many-beam dynamical effect is not negligibly small. A weak fringe contrast is also expected when differs slightly from an integer owing to an additional small displacement of the lattice across the fault. These faint contrasts are termed as many-beam contrasts in the former case, and as ε fringe contrasts in the latter. In the present work stacking faults in Cu-Al alloys and antiphase boundaries (APB) in CuZn, FeCo and Fe-Al alloys were observed under such conditions as mentioned above, and the results were compared with the image profiles of the faults calculated in the systematic ten-beam approximation.

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

THE FORMATION OF VACANCIES IN ORDERED Fe-Al ALLOYS WITH B2 STRUCTURE

1977 ◽  
Vol 38 (C7) ◽  
pp. C7-364-C7-364 ◽  
Author(s):  
D. PARIS ◽  
P. LESBATS
Keyword(s):  
Al Alloys ◽  
B2 Structure
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