Phase decomposition of the γ phase in a Mn–30 at.% Cu alloy during aging

Yin, Fuxing; Ohsawa, Yoshiaki; Sato, Akira; Kawahara, Kohji

doi:10.1016/s1359-6454(99)00419-x

Cited by 56 publications

(23 citation statements)

References 13 publications

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“…3(a), different slopes of the damping capacity with increasing static strains occur at 298 K and 223 K. A larger amount of the preferentially oriented twin boundaries may be produced by the preload strains at temperatures near the phase transformation temperature of the γ Mn phase. 8) The increase of the twin boundaries in the M2052 alloy with static strains may result in the increment of the damping capacity. 9) In contrast, the stress-induced movement of the magnetic domain boundaries by magnetostrictive coupling has been considered as the origin of the high damping capacity in ferromagnetic alloys.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

et al. 2002

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Influences of static strain on the damping capacity in Mn-based M2052 and Fe-6Al alloys were studied with the forced flexural oscillation method by using a dynamic mechanical analyzer (DMA). The static surface strain was applied on the 3-point bending specimens in the range of 1.0 × 10 −5 -2.0 × 10 −4 . The damping capacity of the M2052 alloy showed a continuous increase, but that of the Fe-6Al alloy showed a continuous decrease with increasing static strain in the range below 1.0 × 10 −4 . The variation of the damping capacity with increasing static strain was fitted with an exponential function, and the exponential index turned out to be 0.25 and −0.5 for the M2052 and Fe-6Al alloys, respectively. Static strains in the vicinity of 1.0 × 10 −4 caused the formation of a damping peak, which accelerated the increase of the damping capacity in the M2052 alloy, but softened the decrease of the damping capacity in the Fe-6Al alloy. A significant reduction of the damping capacity appeared at static strains above 1.0 × 10 −4 in both high damping alloys.

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Section: Resultsmentioning

confidence: 99%

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

et al. 2002

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“…While the optimization of the damping microstructure is an important research topic for the already developed high-damping alloys, [4][5][6] it is noted that both dislocation damping and boundary damping are influenced by the interstitial impurities in the alloys. While interstitial impurities are easily introduced into the alloys in the conventional fabrication processes, no work has been done to show the advantage of interstitial solid solution atoms in improving the damping capacity of those alloys.…”

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Snoek‐Type High‐Damping Alloys Realized in β‐Ti Alloys with High Oxygen Solid Solution

et al. 2006

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High-damping alloys are finding more and more applications as a passive damping measure in mechanical structures in attempts to eliminate noise and vibration, especially in circumstances where traditional structural damping or system damping methods are not suitable, for example, in high-temperature environments.[1] High-damping alloys have the ability to damp out noise and vibration, and are expected also to possess adequate mechanical properties such as rigidity and strength. In high-temperature working environments, both high damping capacity and strength at elevated temperatures are required. The damping capacity of high-damping alloys (equivalent to the internal friction of a material) is defined as the capacity of a material to convert its mechanical energy of vibration into heat, which is dissipated in the material. With the exception of thermoelastic damping, the majority of damping mechanisms are associated with the stress-induced movement of crystalline defects. Point defects give rise to damping in the range of low to intermediate levels, dislocations give rise to damping levels in the intermediate to high range, and planar defects (twin boundaries and magnetic domain boundaries) give rise to damping levels in the high range.[2] Three groups of high-damping alloys have been developed in the past 50 years, which apply the mechanisms of dislocation damping, ferromagnetic damping, and twinboundary damping, respectively. However, there are some deficiencies in the damping behavior of the alloys, which have affected the application of high-damping alloys. In the case of dislocation-type damping alloys, rearrangement of the pinning points during continued vibration leads to a damping capacity that varies with service time. [2] Similarly, for twin boundarytype damping alloys, it is reported that degradation of damping capacity occurs when they are held at room temperature, which is induced by the diffusion of interstitial carbon atoms to the twin boundaries.[3] And for ferromagnetic high-damping alloys, the damping capacity will be considerably reduced in the presence of a magnetic field or a static load. While the optimization of the damping microstructure is an important research topic for the already developed high-damping alloys, [4][5][6] it is noted that both dislocation damping and boundary damping are influenced by the interstitial impurities in the alloys. While interstitial impurities are easily introduced into the alloys in the conventional fabrication processes, no work has been done to show the advantage of interstitial solid solution atoms in improving the damping capacity of those alloys. We took up the challenge of obtaining a high damping capacity in alloys by making use of the interstitial solid solution atoms. Point defects in crystalline solids can generate a time-dependent strain under the application of an external stress due to the reorientation of the point defects. This phenomenon was experimentally investigated in body-centered cubic (bcc) metals with interstitial impurities of carbo...

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“…Two features can be found by comparing the three thermal peaks of the specimens; phase transformation temperature, indexed with the temperature where the peak occurs, is changed by the treating condition. With the linear relationship between transformation temperature and Mn content in Mn-Cu alloy, 6) the corresponding Mn content in the decomposed Mn-rich region is calculated to be 90.6, 91.7 and 94.2 at% for FC, AG5 and AG20 treated specimens, respectively. The three treating conditions correspond to the different decomposition stages of FCC phase in the alloy since the Mn content becomes richer in the Mn-rich regions.…”

Section: Methodsmentioning

confidence: 99%

The Twinning Microstructure and Damping Behavior in Mn–30Cu (at%) Alloy

et al. 2005

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The twin boundary damping peak and the transformation damping peak constitute the temperature dependent damping behavior in Mn-Cu alloys. In order to observe the effects of twinning microstructure on the twin boundary damping behavior, a Mn-30 at%Cu alloy was finally treated by furnace cooling (FC) and aging after water-quenching (AG), respectively. Regular twin bands with the similar widths along some {101} twin boundary were observed in FC treated condition, while intersected twin bands with pointed fronts belonging to different {101} twin boundaries occurred in the AG treated specimens. Meanwhile, the twin boundary damping features were obtained based on dynamic mechanical analyzer (DMA) measurement, and increased activation energy and decreased peak damping capacity were found in the AG treated alloy. The distortion state of the interfaces enclosing the decomposed nanometer regions was considered to influence the twinning microstructure formation and hence alter the damping features of the twining microstructure.

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Phase decomposition of the γ phase in a Mn–30 at.% Cu alloy during aging

Cited by 56 publications

References 13 publications

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

Snoek‐Type High‐Damping Alloys Realized in β‐Ti Alloys with High Oxygen Solid Solution

The Twinning Microstructure and Damping Behavior in Mn–30Cu (at%) Alloy

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Phase decomposition of the γ phase in a Mn–30 at.% Cu alloy during aging

Cited by 56 publications

References 13 publications

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

The Effects of Static Strain on the Damping Capacity of High Damping Alloys

Snoek‐Type High‐Damping Alloys Realized in β‐Ti Alloys with High Oxygen Solid Solution

The Twinning Microstructure and Damping Behavior in Mn&ndash;30Cu (at%) Alloy

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The Twinning Microstructure and Damping Behavior in Mn–30Cu (at%) Alloy