Change in magnetic properties of a cold rolled and thermally aged Fe–Cu alloy

Park, D. G.; Ryu, Kwon-Sang; Kobayashi, Satoru; Takahashi, Seiki; Cheong, Yong Moo

doi:10.1063/1.3356227

Cited by 7 publications

(4 citation statements)

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“…As a result, Cu precipitation using thermal aging of Fe–Cu model alloys has been investigated extensively, both experimentally (Goodman et al, 1973 b ; He et al, 2010) and theoretically (Le Bouar, 2001; Shim et al, 2007). Different aspects of this precipitation process have been examined by researchers using various experimental techniques such as field ion microscopy (Goodman et al, 1973 a ; Miller et al, 1998), atom probe tomography (APT) (Pareige et al, 1993; Auger et al, 1995; Shu et al, 2018 a ; Styman et al, 2018), high-resolution transmission electron microscopy (Othen et al, 1991; Deschamps et al, 2001), magnetization measurements (Vandenbossche et al, 2007; Hauser et al, 2008; Park et al, 2010), Vicker's hardness (He et al, 2010; Cao et al, 2013), and small-angle neutron scattering (SANS) (Deschamps et al, 2001; He et al, 2010). Results from these different experimental techniques are largely in agreement with the CRP characteristics such as dimensions and number density.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Temporal Evolution of Cu-Rich Precipitates in Fe–Cu Alloy: Correlative Small Angle Neutron Scattering and Atom-Probe Tomography Studies

et al. 2019

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Binary Fe–Cu alloys are effective prototypes for investigating radiation-induced formation and growth of nanometric Cu-rich precipitates (CRPs) in nuclear reactor pressure vessels. In this report, the temporal evolution of CRPs during thermal aging of Fe–Cu binary alloys has been investigated by using complementary techniques such as atom probe tomography (APT) and small-angle neutron scattering (SANS). We report a detailed quantitative evolution of a rarely observed morphological transformation of Cu precipitates from spherical to ellipsoid with a significant change (approximately two times) in aspect ratio, an effect known to be associated with the 9R-3R structural transition of the precipitates. It is demonstrated through APT that the precipitates remain spherical up to 8 h, however, they subsequently convert to oblate ellipsoid upon further aging. SANS analysis also detected signs of this morphological transition in reciprocal space. Furthermore, SANS quantifies evolution of the precipitates and corroborates well with the APT results. Interestingly, the power-law exponent of the temporal evolution for mean size and number density agree reasonably well with the Lifshitz–Slyozov–Wagner model, in spite of the complex morphological evolution of the precipitates.

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Section: Introductionmentioning

confidence: 99%

Revisiting Temporal Evolution of Cu-Rich Precipitates in Fe–Cu Alloy: Correlative Small Angle Neutron Scattering and Atom-Probe Tomography Studies

et al. 2019

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“…However, longer aging time coarsens the CRPs leading to a reduction in their number density as shown in Table I, 15,[19][20][21] resulting in decrease in H cm and microhardness as the mean free path of domain wall and dislocation movements increases. 15,22 Additionally, the change of inclination in the major loop (i.e., susceptibility) indicates that a larger field is required for S2 and S3 samples to obtain the same magnetization as S1 and S4. That change is consistent with the fact that CRPs can hinder the movement of domain wall (S2 versus S1) and that higher CRP density is more efficient at pinning (S3 versus S4).…”

Section: Resultsmentioning

confidence: 99%

“…Park et al 22 (their Fig. 2) showed that the time at which MBN starts to increase is delayed to higher aging time in cold worked samples.…”

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confidence: 99%

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Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

et al. 2016

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Investigation of effects of long-term thermal aging on magnetization process in low-alloy pressure vessel steels using first-order-reversal-curves AIP Advances 7, 056002 (2017); 10.1063/1.4973605Effect of defects, magnetocrystalline anisotropy, and shape anisotropy on magnetic structure of iron thin films by magnetic force microscopy AIP Advances 7, 056806 (2017) Magnetic Barkhausen noise (MBN), hysteresis measurements, first order reversal curves (FORC), Vickers microhardness, and Transmission Electron Microscopy (TEM) analyses were performed on Fe-1wt.%Cu (Fe-Cu) samples isothermally aged at 700 • C for 0.5 -25 hours to obtain samples with different sized Cu precipitates and dislocation structures. Fe-Cu is used to simulate the thermal and irradiation-induced defects in copper-containing nuclear reactor materials such as cooling system pipes and pressure vessel materials. The sample series showed an initial increase followed by a decrease in hardness and coercivity with aging time, which is explained by Cu precipitates formation and growth as observed by TEM measurements. Further, the MBN envelope showed a continuous decrease in its magnitude and the appearance of a second peak with aging. Also, FORC diagrams showed multiple peaks whose intensity and location changed for different aging time. The changes in FORC diagrams are attributed to combined changes of the magnetic behavior due to Cu precipitate characteristics and dislocation structure. A second series of samples aged at 850 • C, which is above the solid solution temperature of Fe-Cu, was studied to isolate the effects of dislocations. These samples showed a continuous decrease in MBN amplitude with aging time although the coercivity and hardness did not change significantly. The decrease of MBN amplitude and the appearance of the second MBN envelope peak are attributed to the changes in dislocation density and structure. This study shows that the effect of dislocations on MBN and FORC of Fe-Cu materials can vary significantly and should be considered in interpreting magnetic signatures. C 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Atomic scale insights into the rapid crystallization and precipitation behaviors in FeCu binary alloys

Bao

et al. 2021

Journal of Alloys and Compounds

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Change in magnetic properties of a cold rolled and thermally aged Fe–Cu alloy

Cited by 7 publications

References 10 publications

Revisiting Temporal Evolution of Cu-Rich Precipitates in Fe–Cu Alloy: Correlative Small Angle Neutron Scattering and Atom-Probe Tomography Studies

Revisiting Temporal Evolution of Cu-Rich Precipitates in Fe–Cu Alloy: Correlative Small Angle Neutron Scattering and Atom-Probe Tomography Studies

Effects of aging time and temperature of Fe-1wt.%Cu on magnetic Barkhausen noise and FORC

Atomic scale insights into the rapid crystallization and precipitation behaviors in FeCu binary alloys

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