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Gabriela Petculescu
University of Louisiana at Lafayette
23Publications
6H-index
96Citations
Publications 23
Newest
Published on Nov 1, 2018in Corrosion 1.86
C.U. Chukwunonye (University of Louisiana at Lafayette), Nicholas J. Jones7
Estimated H-index: 7
(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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Published on May 1, 2018in AIP Advances 1.58
Nicholas J. Jones7
Estimated H-index: 7
(Naval Surface Warfare Center),
Jin-Hyeong Yoo1
Estimated H-index: 1
(Naval Surface Warfare Center)
+ 5 AuthorsThomas A. Lograsso40
Estimated H-index: 40
(Iowa State University)
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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Published on Oct 1, 2017in Journal of the Acoustical Society of America 1.82
Shankar Kharal , Nicholas J. Jones7
Estimated H-index: 7
,
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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Published on May 7, 2015in Journal of Applied Physics 2.33
Thomas A. Lograsso40
Estimated H-index: 40
(Iowa State University),
Nicholas J. Jones7
Estimated H-index: 7
(Naval Surface Warfare Center)
+ 5 AuthorsK. B. Hathaway6
Estimated H-index: 6
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...
3 Citations Source Cite
Published on May 7, 2015in Journal of Applied Physics 2.33
Nicholas J. Jones7
Estimated H-index: 7
(Naval Surface Warfare Center),
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette)
+ 5 AuthorsThomas A. Lograsso40
Estimated H-index: 40
(Iowa State University)
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
Published on Apr 1, 2012in Journal of Applied Physics 2.33
Gabriela Petculescu6
Estimated H-index: 6
,
Paul K. Lambert1
Estimated H-index: 1
+ 5 AuthorsM. Wun-Fogle26
Estimated H-index: 26
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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Published on Jan 15, 2012in Journal of Applied Physics 2.33
J. B. Restorff20
Estimated H-index: 20
,
M. Wun-Fogle26
Estimated H-index: 26
+ 3 AuthorsGabriela Petculescu6
Estimated H-index: 6
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 ...
48 Citations Source Cite
Published on Jan 1, 2012in Handbook of Magnetic Materials
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette),
Ruqian Wu41
Estimated H-index: 41
(UCI: University of California, Irvine),
R. J. McQueeney23
Estimated H-index: 23
(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...
9 Citations Source Cite
Published on Apr 1, 2011in Journal of Applied Physics 2.33
Gabriela Petculescu6
Estimated H-index: 6
(University of Louisiana at Lafayette),
K. L. Ledet1
Estimated H-index: 1
(University of Louisiana at Lafayette)
+ 7 AuthorsK. B. Hathaway6
Estimated H-index: 6
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
Published on May 1, 2010in Journal of Applied Physics 2.33
Mianliang Huang9
Estimated H-index: 9
(Iowa State University),
A. O. Mandru1
Estimated H-index: 1
(University of Louisiana at Lafayette)
+ 3 AuthorsThomas A. Lograsso40
Estimated H-index: 40
(Iowa State University)
In this paper we investigate the magnetostrictive [(3/2)λ100 and (3/2)λ111] and elastic (c′ and c44) behavior of single crystalline alloys Fe100−xMox for 2<x<12; the magnetoelastic coupling constants (−b1 and −b2) are computed from the measurements. Similar to other Fe–X (X=Al, Ga, and Ge) alloys, the tetragonal magnetostriction (3/2)λ100 increases monotonically from ∼70×10−6 at ∼2.5 at. % Mo to a maximum of either ∼100×10−6 at ∼8 at. % Mo for the slow cooled crystals or ∼125×10−6 at ∼11 at. % M...
1 Citations Source Cite
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