Density of Dislocations in Heavily Cold-Worked Cu-Al Alloys

1973 ◽  
Vol 12 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Yoshiaki Kogure ◽  
Shigeaki Shimizu ◽  
Yosio Hiki
Keyword(s):  
Al Alloys ◽  
Density Of Dislocations ◽  
Cold Worked

MÖSSBAUER STUDY ON RECOVERY OF COLD-WORKED Fe-Al ALLOYS

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-611-C2-612 ◽  
Author(s):  
K. Oki ◽  
S. Towata ◽  
M. Tamiya ◽  
T. Eguchi
Keyword(s):  
Al Alloys ◽  
Mössbauer Study ◽  
Cold Worked

scholarly journals Study of Annealing Effect of Cold-Worked αCu-Al Alloys

1973 ◽  
Vol 37 (9) ◽  
pp. 1019-1025
Author(s):  
Noriyuki Kuwano ◽  
Chiken Kinoshita ◽  
Yoshitsugu Tomokiyo ◽  
Tetsuo Eguchi
Keyword(s):  
Al Alloys ◽  
Annealing Effect ◽  
Cold Worked

Magnetization of disordered cold-worked Fe-Al alloys up to 51 at.% Al

1975 ◽  
Vol 5 (11) ◽  
pp. 2138-2147 ◽  
Author(s):  
M J Besnus ◽  
A Herr ◽  
A J P Meyer
Keyword(s):  
Al Alloys ◽  
Cold Worked

scholarly journals Study of Annealing Effects on Cold-Worked α Phase of Cu–Al Alloys

1974 ◽  
Vol 15 (5) ◽  
pp. 338-344 ◽  
Author(s):  
Noriyuki Kuwano ◽  
Yoshitsugu Tomokiyo ◽  
Chiken Kinoshita ◽  
Tetsuo Eguchi
Keyword(s):  
Alpha Phase ◽  
Al Alloys ◽  
Annealing Effects ◽  
Cold Worked

Annealing of Cold Worked Hypostoichiometric Ni3Al Alloys Using Positron Lifetime Spectroscopy

1986 ◽  
Vol 81 ◽  
Author(s):  
S. G. Usmar ◽  
K. G. Lynn
Keyword(s):  
Positron Lifetime ◽  
National Laboratory ◽  
Al Alloys ◽  
Oak Ridge ◽  
Annealing Temperatures ◽  
Vacancy Migration ◽  
Oak Ridge National Laboratory ◽  
Positron Lifetime Spectroscopy ◽  
Cold Rolled ◽  
Cold Worked

AbstractHypostoichiometric Ni3Al alloys of composition 76.2 Ni:23.8 Al containing impurity levels of boron and hafnium (supplied by Oak Ridge National Laboratory) were either cold rolled or pressed. Rolled and pressed samples were deformed by 20% and 10% thickness reductions, respectively. Samples were annealed isochronally at approximately 50ºC intervals up to 1050ºC. Two major annealing stages were apparent in all three alloys studied. These could be attributed to vacancy migration to sinks and annealingof dislocations and(or) recrystallization. The onset of vacancy migration occurred at approximately 200ºC in all three alloys. Annealing of dislocations started at 650ºC to 700ºC and was complete at 1000ºC for alloys which contained boron and or hafnium impurities. In the pure alloy the onset of dislocation annealing occurred at 800ºC and was incomplete at the highest (1050ºC) annealing temperatures reached.

The internal friction of cold-worked Nb(Cb)-Al alloys

1970 ◽  
Vol 1 (5) ◽  
pp. 1452-1454 ◽  
Author(s):  
E. Davenport ◽  
G. Mah
Keyword(s):  
Internal Friction ◽  
Al Alloys ◽  
Cold Worked

The oxidation of Inconel alloy MA754 at low oxidation potential

1983 ◽  
Vol 41 ◽  
pp. 218-219
Author(s):  
D. N. Braski ◽  
P. D. Goodell ◽  
J. V. Cathcart ◽  
R. H. Kane
Keyword(s):  
Surface Layer ◽  
Oxidation Potential ◽  
Metal Interface ◽  
Elevated Temperature Strength ◽  
Surface Conditions ◽  
Inconel Alloy ◽  
Inco Alloy ◽  
Resistance To Oxidation ◽  
Oxide Particles ◽  
Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

Some aspects of the defect structure in an austenitic stainless steel

1978 ◽  
Vol 36 (1) ◽  
pp. 314-315
Author(s):  
R. Gonzalez ◽  
L. Bru
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cellular Structures ◽  
Total Strain Amplitude ◽  
Total Deformation ◽  
Density Of Dislocations ◽  
Planar Arrays ◽  
Stacking Fault Tetrahedra ◽  
Distribution Of Dislocations ◽  
Very High

The analysis of stacking fault tetrahedra (SFT) in fatigued metals (1,2) is somewhat complicated, due partly to their relatively low density, but principally to the presence of a very high density of dislocations which hides them. In order to overcome this second difficulty, we have used in this work an austenitic stainless steel that deforms in a planar mode and, as expected, examination of the substructure revealed planar arrays of dislocation dipoles rather than the cellular structures which appear both in single and polycrystals of cyclically deformed copper and silver. This more uniform distribution of dislocations allows a better identification of the SFT.The samples were fatigue deformed at the constant total strain amplitude Δε = 0.025 for 5 cycles at three temperatures: 85, 293 and 773 K. One of the samples was tensile strained with a total deformation of 3.5%.

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