Thermo-mechanische Behandlung einer physiologischen NiTi-Legierung / The Thermo-mechanical Treatment of a Physiological NiTi-Alloy

Hornbogen, Erhard; Rittner, Karl

doi:10.1515/pm-1998-361005

Cited by 1 publication

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“…The final shape, which the alloy always remembers, is connected with the (austenite) [9,10]. It has to be shaped without loss of reversible transformability.…”

Section: The Embossing Processmentioning

confidence: 99%

Microstructure and Thermo-Mechanical Properties of NiTi Shape Memory Alloys

Hornbogen

2004

MSF

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Shape memory alloys transform at low temperature by a martensitic reaction , which implies formation of a domain structure (similar to ferromagnetic, ferroelectric transformations). This microstructure allows complex pseudo-plastic deformability (high degree of freedom). Reversion of into restores a definite shape, either by heating to T > A f (austenite finish), or by reduction of the external transformational stress (pseudo-elasticity). It is discussed how a defined final shape is achieved at temperatures high above A f , at which diffusional processes can take place. In addition maximum strength is required for many SMA applications,-especially a high stability at repeated transformations (fatigue, loss of memory). The origin of the microstructure is discussed, which leads to the desired combination of properties. Special attention is paid to thermo-mechanical treatments (TMT), by which a wide range of microstructures can be obtained. A systematic approach is provided for the types of reverse reactions , which are found between, crystalographically reversible (martensitic) and diffusion controlled (combined reactions). Features of optimum microstructures for shaping and desired SM-properties are discussed.

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“…The final shape, which the alloy always remembers, is connected with the (austenite) [9,10]. It has to be shaped without loss of reversible transformability.…”

Section: The Embossing Processmentioning

confidence: 99%

Microstructure and Thermo-Mechanical Properties of NiTi Shape Memory Alloys

Hornbogen

2004

MSF

View full text Add to dashboard Cite

show abstract

Thermo-mechanische Behandlung einer physiologischen NiTi-Legierung / The Thermo-mechanical Treatment of a Physiological NiTi-Alloy

Cited by 1 publication

References 0 publications

Microstructure and Thermo-Mechanical Properties of NiTi Shape Memory Alloys

Microstructure and Thermo-Mechanical Properties of NiTi Shape Memory Alloys

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