On the application of magnetomechanical models to explain damping in an antiferromagnetic copper-manganese alloy

Laddha, Shashi; Aken, David C. Van

doi:10.1007/bf02649092

Cited by 21 publications

(3 citation statements)

References 16 publications

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“…According to Clochard's magneto mechanical damping model, [19] the damping capacity of alloy is proportional to the magneto elastic constant (λ) under same strain amplitudes, and the λ value can be estimated by Equation 3 [20] :…”

Section: Resultsmentioning

confidence: 99%

Remarkable Improvement of Damping Capacity of Mn–20Cu–5Ni–2Fe (at%) Alloy by Zinc Element Addition

Dong

Liu

et al. 2017

Adv Eng Mater

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In this paper, the effect of Zn element addition on martensitic transformation and damping capacity of Mn-20Cu-5Ni-2Fe (at%, M2052) alloy has been investigated systematically by using X-ray diffraction, optical microscopy, and dynamic mechanical analyzer. The results show that martensitic transformation and damping capacity have a crucial dependence on the addition of Zn element. It not only can markedly enhance the damping capacity of M2052 alloy at room temperature (internal friction Q À1 increases by %23% compared to M2052 without Zn as strain amplitude reaches 4 Â 10 À4 ), but also reduces the attenuation of damping capacity effectively at elevated temperatures. This is mainly because the addition of Zn element can evidently increase the Gibbs free energy difference between g parent phase and g' phase produced by face centered cubic to face centered tetragonal (f.c.c-f.c.t) phase transformation, and then raises the martensitic transformation and its reverse transformation temperatures, eventually leading to the apparent increase of amount of f.c.t g' phase micro-twins as damping source and the significant enhancement of damping capacity. It will be of great value for design and optimization of highperformance M2052 damping alloy toward practical applications.

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Section: Resultsmentioning

confidence: 99%

Remarkable Improvement of Damping Capacity of Mn–20Cu–5Ni–2Fe (at%) Alloy by Zinc Element Addition

Dong

Liu

et al. 2017

Adv Eng Mater

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“…Due to the dispersion of the antiferromagnetic regions, the tetragonal regions reorient their c-axis and, in doing so, dissipate energy, giving rise to a high damping capacity. [12] When the M2052 was aged at 435℃ for 4 h，the best original damping capacity was obtained. With further aging (8h), α-Mn was precipitated as observed in Figure 2(c).…”

Section: Methodsmentioning

confidence: 97%

Effect of the Precipitated Second Phase during Aging on the Damping Capacity Degradation Behavior of M2052 Alloy

Zhang¹,

Li²,

Jia³

et al. 2013

AMR

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In this study, the damping capacity degradation in Mn-20Cu-5Ni-2Fe alloy (M2052) aged at 435 °C for 2-24 hours was investigated. The damping capacity was measured by a torsion pendulum. XRD, SEM and EDS analysis methods were used to characterize the microstructure of specimens. The results showed that aging at 435 °C for more than 4 h leaded to the precipitation of α-Mn in the matrix of M2050, which resulted in the decrease of the original damping capacity. Holding the aged samples in 60°C environment, the damping capacity of under-aged and peak-aged M2052 samples decreased rapidly with the time increasing. While no obvious degradation of damping capacity occurred in the over-aged sample even after 40 d, which is probably due to the precipitation of α-Mn phase in the matrix of alloy. M2050 alloy with high and stable damping capacity can be obtained by aging at 435°C for 8 h.

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“…Such alloys are considered to be high damping metals. These alloys exhibit damping of about 0.003 or less at small strains below 10 −5 but can exceed a damping of 0.01 at a few Hz if the strain is sufficiently large, 3 × 10 −4 (Laddha and Van Aken 1995).…”

Section: Small Deformation Nonlinearmentioning

confidence: 99%

Column dampers with negative stiffness: high damping at small amplitude

Kalathur¹,

Lakes²

2013

Smart Mater. Struct.

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High structural damping combined with high initial stiffness is achieved at small amplitude via negative stiffness elements. These elements consist of columns in the vicinity of the post-buckling transition between contact of flat surfaces and edges of the ends for which negative incremental structural stiffness occurs. The column configuration provides a high initial structural stiffness equal to the intrinsic stiffness of the column material. Columns of the polymers polymethyl methacrylate (PMMA) and polycarbonate were used. By tuning the pre-strain, a very high mechanical damping was achieved for small amplitude oscillations. The product of effective stiffness and effective damping as a figure of merit |Eeff|tanδeff of about 1.5 GPa was achieved for polymer column dampers in the linear domain and about 1.62 GPa in the small amplitude nonlinear domain. For most materials this value generally never exceeds 0.6 GPa.

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On the application of magnetomechanical models to explain damping in an antiferromagnetic copper-manganese alloy

Cited by 21 publications

References 16 publications

Remarkable Improvement of Damping Capacity of Mn–20Cu–5Ni–2Fe (at%) Alloy by Zinc Element Addition

Remarkable Improvement of Damping Capacity of Mn–20Cu–5Ni–2Fe (at%) Alloy by Zinc Element Addition

Effect of the Precipitated Second Phase during Aging on the Damping Capacity Degradation Behavior of M2052 Alloy

Column dampers with negative stiffness: high damping at small amplitude

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