Room Temperature Internal Friction in Annealed Iron Alloys

Sugimoto, Koichi; Ibaraki, Masao

doi:10.2320/matertrans1960.3.167

Cited by 2 publications

(2 citation statements)

References 12 publications

(6 reference statements)

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“…Internal friction Q-1 was determined by the free-decay method previously reported (10). The Young's modulus was calculated from the resonance frequency by the formula described elsewhere (11 i.e., an amplitude-independent part QI-1 and an amplitude-dependent part QH-1.…”

Section: Methods Of Measurementsmentioning

confidence: 99%

Effect of Crystal Orientation on Amplitude-Dependent Damping in Magnesium

et al. 1975

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The amplitude-dependent internal friction and Young's modulus have been measured as a function of the crystal orientation in magnesium single crystal specimens of 99.9% purity by using a flexural vibration method at room temperature. It has been found that, if only the basal slip system is operative, Schmid's law holds for the orientation dependence of the breakaway stress gests that the amplitude-dependent internal friction is caused by the movement of basal dislocations. In addition the analysis of the internal friction data based on the Granato-Lticke theory has also given evidence that the amplitude-dependence of internal friction is caused by the static hysteresis due to the interaction of basal dislocations with impurity atoms. Complementary experiments using polycrystalline specimens of magnesium and zinc showed that the amplitude-dependence of internal friction was extremely sensitive to the crystallographic orientation of individual grains.large amplitude-dependence of internal friction. In contrast a specimen with columnar grains whose longitudinal direction was almost parallel to the specimen axis had a much larger value of a8 and displayed very little amplitude-dependence of internal friction. Similar behaviour was observed in two zinc specimens having quasi-equiaxed grains and the (0001) rolling texture, respectively. It was concluded that the Schmid factors in individual grains played the most important role in the amplitude-dependent internal friction of hexagonal close-packed metals.

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Section: Methods Of Measurementsmentioning

confidence: 99%

Effect of Crystal Orientation on Amplitude-Dependent Damping in Magnesium

et al. 1975

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“…Of the three methods, (1) and (2) seem to be not suitable for the present purpose, because the mobility of dislocations in magnesium would be decreased to a large extent by the solute atoms or the precipitated particles and hence the damping capacity would be very much reduced. Therefore, (3) seems to be the only way to improve the mechanical strength of the magnesium alloy without reducing the damping capacity. The eutectic reaction in the Mg-Mg2Ni system may be effectively utilized for production of the natural composite.…”

Section: Introductionmentioning

confidence: 99%

A Study of Damping Capacity in Magnesium Alloys

et al. 1977

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The effects of additions of nickel to magnesium over the composition range from 0 to 40.41 and of copper, aluminium, and tin to magnesium by 15.10%, 18.40%, and 21.40%, respectively, on the internal friction and Young's modulus have been investigated by use of the flexural vibration method at room temperature. It was generally found that the Mg-Mg2Ni hypo-eutectic alloy samples had the well-defined amplitude-dependence of internal friction which resulted in a very high damping capacity at higher stress levels. The damping capacity of the eutectic and hyper-eutectic samples of the Mg-Mg2Ni alloy and also of the hypo-eutectic samples of the Mg-Mg2Cu, Mg-Mg17Al12, and Mg-Mg2Sn alloys was not so high as that of the hypo-eutectic samples of the Mg-Mg2Ni alloy. The effects of the size and shape of the magnesium phase, the solubility of the alloying elements in magnesium and the grain size on the behaviour of internal friction and Young's modulus were examined and discussed. The results were explained in terms of the vibrating string model of the dislocations in magnesium which were pinned weakly by impurity atoms. It is concluded that the very small solubility of nickel in magnesium and the dendritic or globular shape of the primary magnesium in the Mg-Mg2Ni hypo-eutectic samples are responsible for the much lower breakaway stress than that in other alloys and pure magnesium samples.

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Room Temperature Internal Friction in Annealed Iron Alloys

Cited by 2 publications

References 12 publications

Effect of Crystal Orientation on Amplitude-Dependent Damping in Magnesium

Effect of Crystal Orientation on Amplitude-Dependent Damping in Magnesium

A Study of Damping Capacity in Magnesium Alloys

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