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Gabriela Petculescu
University of Louisiana at Lafayette
22Publications
6H-index
88Citations
Publications 22
Newest
2018 in AIP Advances [IF: 1.65]
Nicholas J. Jones2
Estimated H-index: 2
(Naval Surface Warfare Center),
Jin-Hyeong Yoo1
Estimated H-index: 1
(Naval Surface Warfare Center),
R.T. Ott9
Estimated H-index: 9
(Ames Laboratory)
... more
Magnetostrictive materials exhibit a strain in the presence of a variable magnetic field. While they normally require large, highly oriented crystallographic grains for high strain values, metal additive manufacturing (3D printing) may be able to produce highly textured polycrystalline rods, with properties comparable to those manufactured using the more demanding free standing zone melting (FSZM) technique. Rods of Co75.8Fe24.2 and Co63.7Fe36.3 have been fabricated using the Laser engineered ne...
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2018 in Corrosion [IF: 1.93]
C.U. Chukwunonye (University of Louisiana at Lafayette), Nicholas J. Jones2
Estimated H-index: 2
(Naval Surface Warfare Center),
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette)
Velocity and attenuation of shear and longitudinal sound waves were measured as a function of sensitization level in AA5083-H116 and AA5456-H116 aluminum alloys using two different techniques: resonant ultrasound spectroscopy (RUS) and pulse echo (PE). The frequency range for RUS was 0.3 MHz to 1 MHz. For PE, longitudinal 3.5 MHz and shear 1 MHz transducers were used. Sensitization was artificially induced in the laboratory by isothermally heating specimens at temperatures of 120°C, 175°C, 185°C...
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Shankar Kharal , Nicholas J. Jones2
Estimated H-index: 2
,
Gabriela Petculescu6
Estimated H-index: 6
Segregation of atomic species in metastable solid-solution alloys results in a gradual change of the alloy’s properties, sometimes rendering the materials ineffective for the particular task they were designed for. An example of such a case is the sensitization of strong and lightweight Mg-rich aluminum alloys used in marine applications. The ASTM standard is an acid-corrosion test (G67), a destructive and lengthy procedure that requires large specimens analyzed off-site. Ultrasound is a well-kn...
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Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette)
The present invention relates generally to a system and methods for testing sensitization of alloy nondestructively. More specifically, the present invention relates to a system and methods for determining the sensitization of an alloy by measuring ultrasonic parameters of the alloy using ultrasonic techniques, and correlating the measured ultrasonic parameters. In certain embodiments, the ultrasonic measuring techniques include pulse-echo and resonant ultrasound spectroscopy. Certain embodiment...
Source
2015 in Journal of Applied Physics [IF: 2.18]
Thomas A. Lograsso37
Estimated H-index: 37
(Iowa State University),
Nicholas J. Jones2
Estimated H-index: 2
(Naval Surface Warfare Center),
Deborah L. Schlagel19
Estimated H-index: 19
(Ames Laboratory)
... more
Fe1−xMx (M = Ga, Ge, Si, Al, Mo and x ∼ 0.18) alloys offer an extraordinary combination of magnetoelasticity and mechanical properties. They are rare-earth-free, can be processed using conventional deformation techniques, have high magnetic permeability, low hysteresis, and low magnetic saturation fields, making them attractive for device applications such as actuators and energy harvesters. Starting with Fe-Ga as a reference and using a rigid-band-filling argument, Zhang et al. predicted that l...
2 Citations Source Cite
2015 in Journal of Applied Physics [IF: 2.18]
Nicholas J. Jones2
Estimated H-index: 2
(Naval Surface Warfare Center),
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette),
M. Wun-Fogle25
Estimated H-index: 25
(Naval Surface Warfare Center)
... more
Iron is a well-utilized material in structural and magnetic applications. This does not mean, however, that it is well understood, especially in the field of magnetostriction. In particular, the rhombohedral magnetostriction of iron, λ111, is anomalous in two respects: it is negative in sign, in disagreement with the prediction of first principles theory, and its magnitude decreases with increasing temperature much too rapidly to be explained by a power law dependence on magnetization. These beh...
1 Citations Source Cite
2012 in Journal of Applied Physics [IF: 2.18]
J. B. Restorff20
Estimated H-index: 20
,
M. Wun-Fogle25
Estimated H-index: 25
,
K. B. Hathaway6
Estimated H-index: 6
... more
This paper presents a comparative study on the tetragonal magnetostriction constant, λγ,2, [ = (3/2)λ100] and magnetoelastic coupling, b1, of binary Fe100-xZx (0 < x < 35, Z = Al, Ga, Ge, and Si) and ternary Fe-Ga-Al and Fe-Ga-Ge alloys. The quantities are corrected for magnetostrains due to sample geometry (the magnetostrictive form effect). Recently published elastic constant data along with magnetization measurements at both room temperature and 77 K make these corrections possible. The form ...
44 Citations Source Cite
2012 in Journal of Applied Physics [IF: 2.18]
Gabriela Petculescu6
Estimated H-index: 6
,
Paul K. Lambert1
Estimated H-index: 1
,
Arthur E. Clark23
Estimated H-index: 23
... more
Tetragonal magnetostriction (λγ,2) and elastic constants (c′, c44, and c11) for Fe100−xSix were measured as a function of temperature (T). Compositions corresponding to the disordered A2 (x = 5), ordered D03 (x = 19.8), and mixed (x = 11.6) phases, were investigated. The magnetoelastic coupling (−b1) was determined for 77 < T < 300 K and compared with those of Fe-Ga, Fe-Ge, and Fe-Al. Both λγ,2(T) and −b1(T) of Fe-Si behave similarly to those of Fe-Ge, while other notable differences exist betwe...
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Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette),
Ruqian Wu1
Estimated H-index: 1
(University of California, Irvine),
R. J. McQueeney20
Estimated H-index: 20
(Iowa State University)
Publisher Summary The study of Fe–Ga and related alloys is an active frontier research effort. This chapter provides some insightful understanding of the large magnetostriction observed in this family of materials. Excellent agreement between theory and experiment has been achieved for the Fe–Ga zone I composition alloys. Here, Ga atoms are far apart from each other and they enhance the magnetostriction “locally.” The large magnetostriction of Fe–Ga in this region is caused by intrinsic electron...
7 Citations Source Cite
2011 in Journal of Applied Physics [IF: 2.18]
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette),
K. L. Ledet1
Estimated H-index: 1
(University of Louisiana at Lafayette),
Mianliang Huang9
Estimated H-index: 9
(Ames Laboratory)
... more
The contrast between the saturation tetragonal magnetostriction, λγ,2 = (3/2)λ100, of Fe1−xGax and Fe1−yGey, at compositions where both alloys exhibit D03 cubic symmetry (second peak region), was investigated. This region corresponds to x = 28 at. % Ga and y = 18 at. % Ge or, in terms of e/a = 2 x + 3 y + 1, to an e/a value of ∼1.55 for each of the alloys. Single crystal, slow-cooled, ternary Fe1−x−y GaxGey alloys with e/a ∼1.55 and gradually increasing y/x were investigated experimentally (magn...
7 Citations Source Cite
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