Reversible phase transformations in a shape memory alloy In–Tl nanowires observed by in situ transmission electron microscopy

Transition from many domain to single domain martensite morphology in small-scale shape memory alloys

“…The technique has also been employed to study the morphological evolution of martensite plates as they nucleate and grow and how this evolution is affected by dislocations [37,38] grain boundaries [39] and precipitates [40][41][42]. Lastly, in situ studies have been used to study interfaces [43], determining selection rules for stress-induced martensite phases and variants [44][45][46][47] and observing dislocation substructure evolution during cycling [48][49][50][51].…”

An Overview on the Indium–Thallium (In–Tl) Shape Memory Alloy Nanowires

“…A quantitative processing of the SAD data using the procedures described in Ref. [25] clearly depicts double peaks [21]. Hence, the structure at RT is fct.…”

“…As early as 1972, Wayman and Shimizu [1] suggested the prerequisites for the shape memory behavior as that the (1) martensitic transformation is thermoelastic; (2) parent and martensitic phases are ordered; and (3) that the martensite is internally twinned. In the In-Tl system with (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) at.% Tl, the crystal structure of the parent phase is face-centered cubic (fcc), while upon cooling these alloys undergo a martensitic transformation to a face-centered tetragonal (fct) structure with c/a = 1.03, where a and c are the lattice parameters. The crystallographic relationship between these phases is shown in Fig.…”

“…Therefore, it is feasible to prepare the In-Tl NWs using the mechanical injection method. Recently, In-Tl NWs have been successfully fabricated [20,21]. This article presents an overview of the recent research on novel In-Tl-based SMA NWs.…”

“…The author is grateful to his colleagues in references [16][17][18][19][20][21] for providing the samples and valuable discussions.…”