Internal friction peak associated with the interface motion in the martensitic transformation of CuAlNiMnTi shape memory alloy

Abstract

Two internal friction peaks were observed in a CuAlNiMnTi polycrystalline shape memory alloy during the martensitic transformation through an incomplete phase transformation method, of which the high-temperature peak PH is discussed in the present study. It has been found that the PH peak is discernible only at relatively low frequencies and its maximum corresponds to the inflection point of the relative dynamic modulus rather than its minimum, i.e., this peak is related to a process without soft mode effect. An internal friction model is proposed to describe the PH peak based on the theory of phase nucleation and growth in the thermoelastic martensitic transformation and is verified by the experimental results.

Athermal Resistance to Phase Interface Motion Due to Precipitates: A Phase Field Study

“…Martensitic transformation induced by the precipitate was studied using phase field approach [6]. An internal friction model was suggested based on the theory of phase nucleation and growth which shows the significant change in the thermoelastic martensitic transformation due to interstitials [7]. At nanoscale, athermal friction can be caused by the Peierls barrier or the interaction of interface with long-range stress fields of defects [8][9][10] which can change the nanostructure evolution, kinetics and thermodynamics and is responsible for temperature hysteresis.…”

Mechanical spectrum and oxygen vacancies in γ-Na0.66CoO2

“…Mechanical spectrum is a well-known probe for the study of the phase transition and the relaxation of micro-units such as point defects, dislocations, grain boundaries, and domain walls in solids [21][22][23][24][25][26]. It is sensitive to the mobility of atoms on an atomic scale.…”