scholarly journals Effect of NiAl Precipitates on Strength and Damping Capacity of Fe-Cr-Al Alloys

2015 ◽  
Vol 101 (7) ◽  
pp. 394-399
Author(s):  
Mahito Morita ◽  
Hiroyuki Y. Yasuda
Keyword(s):  
Al Alloys ◽  
Damping Capacity

scholarly journals Effect of Ni Doping on Strength and Damping Capacity of Fe–Al Alloys

2013 ◽  
Vol 53 (4) ◽  
pp. 704-708 ◽  
Author(s):  
Hiroyuki Y. Yasuda ◽  
Kouki Fukushima ◽  
Keiji Kouzai ◽  
Taisuke Edahiro
Keyword(s):  
Al Alloys ◽  
Damping Capacity ◽  
Ni Doping

Influence of Heat Treatment on Magnetic and Damping Properties of Fe-11 at.% Al Alloys

2008 ◽  
Vol 137 ◽  
pp. 129-136 ◽  
Author(s):  
Agnieszka Mielczarek ◽  
Werner Riehemann ◽  
Olga A. Sokolova ◽  
Igor S. Golovin
Keyword(s):  
Heat Treatment ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Al Alloys ◽  
Damping Capacity ◽  
Amplitude Dependence ◽  
Magnetic Domain Walls ◽  
Mechanical Damping ◽  
The Difference ◽  
Vibrating Reed

The influence of heat treatment on the amplitude dependence of internal friction in Fe - 11 at. % Al alloys with carbon contents in the range 0.005 - 0.2 at. % has been studied using an inverted torsion pendulum in the temperature range 300 – 950 K and a vibrating reed apparatus at room temperature. The specimens were annealed at 1273 K in vacuum and cooled down with different cooling rates in order to obtain different degrees of order. It was found that ordering is hardly avoidable in Fe - Al alloys with Al contents > 11 at. %. Ordered alloys are characterised by lower damping capacity due to higher coercivity caused by additional pinning of magnetic domain walls by antiphase boundaries. X-ray diffraction investigations indicate that water-cooling suppresses ordering in Fe - 11 at. % Al alloys while cooling in air or in furnace provokes D03–type ordering. Slowly cooled specimens are characterised by higher damping capacity due to lower coercivity than water cooled or plastically deformed specimens. The amplitude dependent magneto-mechanical damping was determined as the difference between amplitude dependent damping without and with saturating magnetic field (~ 20 kA/m). Magneto-mechanical damping was found to be proportional to the strain where the amplitude dependent damping is maximum and reciprocal to the coercivity and saturation polarisation. Cold rolling increases the coercivity and therefore decreases the magneto-mechanical damping. An increase of the grain size in the investigated samples by heat treatment leads to a qualitatively expected decrease of coercivity and therefore to an increase of magneto-mechanical damping.

scholarly journals Effect of alloying elements and heat treatment on damping capacity of Mg-Al alloys.

1998 ◽  
Vol 48 (5) ◽  
pp. 217-221 ◽  
Author(s):  
Hiroshi KAGEYAMA ◽  
Masayuki SHIMAZU ◽  
Shigeharu KAMADO ◽  
Yo KOJIMA
Keyword(s):  
Heat Treatment ◽  
Al Alloys ◽  
Alloying Elements ◽  
Damping Capacity ◽  
Effect Of Alloying

On the Formation of High Damping State in Fe-Al and Fe-Cr Alloys

2008 ◽  
Vol 137 ◽  
pp. 109-118 ◽  
Author(s):  
I.B. Chudakov ◽  
Nataly A. Polyakova ◽  
S.Yu. Mackushev ◽  
V.A. Udovenko
Keyword(s):  
Domain Structure ◽  
Domain Walls ◽  
Volume Fraction ◽  
Magnetic Domain ◽  
Al Alloys ◽  
The State ◽  
Magnetic Domain Structure ◽  
Damping Capacity ◽  
Domain Structures ◽  
Domain Boundaries

High damping Fe - Cr and Fe - Al alloys have been studied in two different states: in the high damping state and in the suppressed damping capacity state. It has been shown that magnetic domain structures of Fe - Cr and Fe - Al alloys are fundamentally different in the high damping state and in the state with the suppressed damping. Magnetic domain structure corresponding to the high damping state can be characterized by an enhanced volume fraction of the easy movable 90o-domain walls, but the state with the suppressed damping capacity can be characterized by the enhanced volume fraction of the 180o-domain boundaries.

scholarly journals Damping Capacity of Hypo-Eutectic Zn-Al Alloys

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-309-C8-312 ◽  
Author(s):  
T. Kurosawa ◽  
T. Otani ◽  
K. Hoshino
Keyword(s):  
Al Alloys ◽  
Damping Capacity

Effect of Thermal and Thermal Magnetic Treatment on Damping Properties of Fe-Cr-Al Alloys

2017 ◽  
Vol 265 ◽  
pp. 611-614
Author(s):  
M.A. Melchakov ◽  
A.I. Scvortsov ◽  
A.A. Scvortsov
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Treatment Effect ◽  
Alloy System ◽  
Magnetic Treatment ◽  
Al Alloys ◽  
Thermomagnetic Treatment ◽  
Damping Capacity ◽  
Al Alloy ◽  
Damping Properties

The authors studied the effect of the pre–heat treatment and subsequent thermomagnetic treatment on the damping and magnetic properties of the Fe–Cr–Al alloy system. This article reveals the dependences of influence of chromium and aluminum on the thermomagnetic treatment effect. As a result, the study identified the optimal modes of treatment of the alloys to maximize the damping capacity.

High damping capacity of Al alloys produced by friction stir processing

2018 ◽  
Vol 136 ◽  
pp. 382-387 ◽  
Author(s):  
C.Y. Liu ◽  
H.J. Jiang ◽  
B. Zhang ◽  
Z.Y. Ma
Keyword(s):  
Friction Stir Processing ◽  
Al Alloys ◽  
Damping Capacity ◽  
Friction Stir

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.

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