About: Martensitic transformations in NiTi alloys     Goto   Sponge   NotDistinct   Permalink

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  • 1) Vysvětlit vztah mezi parametry atmosféry tepelného zpracování, stavem hranic zrn a drahou martenzitické transformace. 2) Nalézt mikrostrukturní příčiny změn únavových charakteristik v průběhu cyklování. 3) Připravit slitiny NiTi s nízkou kontaminací C a O vakuovým tavením v keramickém kelímku. (cs)
  • The application addresses two opened questions on the relation between microstructure and martensitic transformations in NiTi shape memory alloys: (i) how the transformation path depends on chemistry and structure of grain boundaries in polycrystals, in which boundaries can be affected by processing atmospheres during heat treatments and (ii) what is the microstructural reason for pronounced changes of hysteresis loops during functional fatigue of superelastic NiTi wires. The application also focuses on one metallurgical issue which is the vacuum melting of NiTi alloys in refractory crucibles. Here the effort aims at an alloy with low oxygen content and no additional carbon contamination. Were the project granted, we may expect the following results: (i) a new insight into the relation between processing atmospheres, state of grain boundaries and the subsequent path of martensitic transformation, (ii) a microstructurally based account for changes in the fatigue behaviour of superelastic wires and (iii) set of parameters that would optimize the vacuum melting in refractory crucibles. (en)
Title
  • Martensitic transformations in NiTi alloys (en)
  • Martenzitické transformace ve slitinách NiTi (cs)
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  • martenzitická transformace, superelasticita, mikrostruktura, vakuové indukční tavení (en)
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