Mein Praesentationsbild - Berlin, 2008.

Wissenschaftsservice - Materialforschung - Dr. Viktor Prieb

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Heterogeneous and homogeneous stress-induced martensitic transformation from different austenitic state of heat treated Cu-Zn-Al single-crystals

V. Prieb

Abstract: Stress-induced martensitic transformations with a single-interface and with multiple-interfaces are investigated on single-crystals of the non-stoichiometric Cu-16.0 at% Zn-15.2 at% Al shape memory alloy.

Two different kinetics are caused by the austenite start-structure that was investigated by transmission electron microscopy after different heat treatments. Thermodynamic parameters of the stress-free thermal-induced transformation of the same heat treated single-crystal alloy were also determined by calorimetry.

The heterogeneous stress-induced martensitic transformation is energetically more favourable from the homogeneous austenite and the homogeneous stress-induced transformation, from a heterogeneous austenite structure which is interpreted as a (B2+DO3)-mixture.

This situation is likely the homogeneous (Luder's line) and heterogeneous (multiple slipping) plastic deformation. The single-interface velocity, the martensitic strain inside of the martensitic single-domain, and the increase/decrease of the sample temperature due to adiabatic single interface propagation are measured.

More:
"Investigation of SMA" - collected articles (pdf-file)