Direction of atom displacement in incommensurate state of Ti-32Pd-18Fe shape memory alloy

作者：Todai Mitsuharu^*; Fukuda Takashi; Kakeshita Tomoyuki

来源：Materials Letters, 2013, 108: 293-296.

DOI：10.1016/j.matlet.2013.07.018

• Electron microscopy
• Phase transformation
• Shape memory materials
• Electrical properties

Displacement of atoms causing diffuse satellites in a Ti-32Pd-18Fe alloy (in at%) has been investigated by transmission electron microscopy (TEM). In this alloy, diffuse satellites appear at incommensurate positions given by g(B2)+q when the zone axis is [111] and [001], but they are missing when [110]. This results imply that the satellites appear because of a transverse wave with a propagation vector of q similar to 1/5 <zeta(zeta) over bar0 >* and displacement in (110) direction. Possibly, this transverse wave occurs as a result of phonon softening of the TA(2) phonon branch, which is a common feature for B2-type Ti-based shape memory alloys.

• 出版日期2013-10-1