| Issue |
Europhys. Lett.
Volume 71, Number 1, July 2005
|
|
|---|---|---|
| Page(s) | 98 - 103 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10061-y | |
| Published online | 27 May 2005 | |
Size-dependent martensitic transformation path causing
atomic-scale twinning of nanocrystalline 
shape memory alloys
Institute of Materials Physics University of Vienna Boltzmanngasse 5, A-1090 Vienna, Austria
Corresponding author: waitz@ap.univie.ac.at
Received:
14
March
2005
Accepted:
4
May
2005
Nanocrystalline alloys were processed by
devitrification of an amorphous phase to elucidate the impact of
the nanocrystallinity on the thermally induced martensitic phase
transformation. Forced by a size-dependent strain energy barrier,
atomic-scale twinning leads to a unique path of the martensitic
phase transformation. The observed twin boundaries of very low
energy facilitate arrays of compound twins on atomic scale to
overcome the strain energy barrier of the nanograins thus
violating the hitherto well-established theory of
martensite formation.
PACS: 64.70.Nd – Structural transitions in nanoscale materials / 68.35.-p – Solid surfaces and solid-solid interfaces: Structure and energetics / 68.37.Lp – Transmission electron microscopy (TEM) (including STEM, HRTEM, etc.)
© EDP Sciences, 2005
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