Strain Glass: Glassy Martensite
| Periodical | Materials Science Forum (Volume 583) |
|---|---|
| Main Theme | Advances in Shape Memory Materials |
| Edited by | V.A. Chernenko |
| Pages | 67-84 |
| DOI | 10.4028/www.scientific.net/MSF.583.67 |
| Citation | Yu Wang et al., 2008, Materials Science Forum, 583, 67 |
| Online since | May, 2008 |
| Authors | Yu Wang, Xiao Bing Ren, Kazuhiro Otsuka |
| Keywords | Ferroic Glass, Martensitic Transition, Point Defect, Shape Memory Effect (SME), Strain Glass Transition, Ti-Ni |
| Price | US$ 28,- |
“Glass”, a frozen disordered-state, has been found in areas as diverse as amorphous solids, magnetic alloys, ferroelectrics, superconductors, and even in models of biological evolutions. In the present review we introduce a new class of glass–the “strain-glass”, which was discovered very recently. Strain glass is derived from a martensitic system, where the local-strain is frozen in disordered configuration. The first example of strain glass was found in the well-studied Ni-rich Ti50-xNi50+x martensitic system in its “non-transforming” composition regime (x>1.5). Contrasting to the familiar martensitic transition, the strain glass transition is not accompanied by a change in the average structure, or a thermal peak in the DSC measurement. It involves a dynamic freezing process with broken ergodicity, during which nano-sized martensite domains are frozen. More interestingly, the seemingly “non-martensitic” strain glass exhibits unexpected properties: shape memory effect and superelasticity, like a normal martensitic alloy. Strain glass bears a striking similarity with other two classes of glasses: cluster-spin glass and ferroelectric relaxor. These ferroic-transition-derived glasses can be considered as a more general class of glass: ferroic glass. The finding of strain glass may provide new opportunities for martensite research from both fundamental side and application side.
