STACKING FAULT FORMATION IN A FAULTED Cu-Zn-Al - MARTENSITE

Gotthardt, R.

doi:10.1051/jphyscol:19824108

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…These relatively isolated (with respect to twinning dislocations in intervariant boundaries) internal defects are able to perform rather large-scale reversible nonlinear displacement, but their mobility decreases with the decrease of the variant size. Observations of higher mobility of internal defects of variants as compared to intervariant interfaces during in situ TEM tests (Gotthardt 1982) strongly support this interpretation. Thus, small martensitic variant size, providing higher total density of defects, is preferable if a high value of lowamplitude damping is required for a specific application.…”

Section: Damping Properties Of Cu-based and Niti Alloys At Ambient Te...mentioning

confidence: 69%

Active and passive damping of noise and vibrations through shape memory alloys: applications and mechanisms

Humbeeck¹,

Kustov²

2005

Smart Mater. Struct.

114

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Recent achievements have been analysed in designing and application of shape memory alloys as high-damping elements, utilizing pseudoelastic hysteresis, transient damping effects in the two-phase state and damping capacity of the martensitic phase.Dealing with intrinsic damping capacity of martensitic phases, several new observations are described, like 'universal' low-temperature high-damping properties of ternary Cu-based alloys, high non-linear damping capacity of a binary NiTi in R phase and high linear damping of binary hydrogen-charged NiTi. Based on the analysis of results of recent studies of damping in NiTi (B19 martensite, R phase) and Cu-based families of alloys (Cu-Al-Ni, Cu-Zn-Al, Cu-Al-Be), we try to introduce a guideline relating desired damping properties of a SMA with its structural characteristics. Among the parameters determining the contribution of specific defect species to damping we suggest considering• density of specific type of defects (intervariant boundaries and internal defects of variants like dislocations and twins); • their mobility (determined by crystallography and geometrical factors, like accommodation and size of martensitic variants); • concentration and type of obstacles impeding the motion of defect species and, thus, producing damping (concentration, mobility and distribution of quenched-in/point-like defects, precipitates, etc).The importance of distinguishing linear and non-linear components of damping is emphasized, since, in a general case, they can be related to different elements of defect microstructure of martensite.

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Section: Damping Properties Of Cu-based and Niti Alloys At Ambient Te...mentioning

confidence: 69%

Active and passive damping of noise and vibrations through shape memory alloys: applications and mechanisms

Humbeeck¹,

Kustov²

2005

Smart Mater. Struct.

114

View full text Add to dashboard Cite

show abstract

“…They conclude that no shear type stacking faults are present in Cu-Zn-Al (18R type) martensite, although moving stacking faults are observed frequently when interfaces move (15). This discrepancy can be explained by the different conditions during the respective observations.…”

Section: Interfaces Martensite-martensitementioning

confidence: 56%

“…This can be detected by a change of the contrast of existing stacking faults and by moving limiting partial dislocations. Such an activity has already been observed in preliminary experiments (15). In order to explain the observations, a part of the specimen is presented schematically in Fig.…”

Section: Interfaces Martensite-martensitementioning

confidence: 99%