The nature of the parent-martensite interface in titanium-manganese

Mobile Interfacial Microstructures in Single Crystals of Cu–Al–Ni Shape Memory Alloy

“…However, such needlelike structure was observed only at some parts of the habit planes and only at sample faces with specific crystallographic orientations, so the understanding to the mechanisms of their formation would require further analysis. On the other hand, this microstructure resembles the zig-zag habit plane morphology observed in Ti-Mn alloy [34] and analyzed theoretically by Stupkiewicz et al [35].…”

Transmission Electron Microscopy of Twins in 10M Martensite in Ni–Mn–Ga Ferromagnetic Shape Memory Alloy

“…In general, the boundary of the compound twin was observed not to be sharp plane in the martensite phase of various shape memory alloys, since the twinning shear of the compound twin is smaller than that of the Type I and Type II twins. 9,11,12,2123,28) In the present alloy, the twinning shear is very small not only in the {105} compound twin but also in the f1 2 5g Type I twin as listed in Table 1 in comparison to the other systems such as TiNi and CuAlNi. Therefore, the twin boundary is not sharp in both the Type I and the compound twins.…”

A simple and inclusive method to determine the habit plane in transmission electron microscope based on accurate measurement of foil thickness

“…The irrational habit planes are commonly observed in a precipitation system, such as {5 3 3} Cu habit plane between Cr-rich precipitates and Cu matrix [6], {11, 11, 13}  habit plane between proeutectoid  phase and  matrix in a Ti-Cr alloy [7], {3.0, 2.2, 3.4}  habit plane between proeutectoid  phase and  phase in a Zr-Nb alloy [8], and {1 1 4}  habit plane between proeutectoid cementite and austenite in a hypereutectoid steel [9]. The irrational habit planes are also reproducibly observed in many martensitic transformations, including the wellknown {2 2 5}  , {2 5 9}  and {5 5 7}  habit plane in ferrous alloys [10,11] and {3 3 4}  habit plane in Ti alloys [12]. It should be noted that the planes expressed by integral indices in the above examples are the closest ones to the actual habit plane and are used for convenience of communication.…”