ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
“Glass”, a frozen disordered-state, has been found in areas as diverse as amorphoussolids, 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 veryrecently. Strain glass is derived from a martensitic system, where the local-strain is frozen indisordered configuration. The first example of strain glass was found in the well-studied Ni-richTi50-xNi50+x martensitic system in its “non-transforming” composition regime (x〉1.5). Contrasting tothe familiar martensitic transition, the strain glass transition is not accompanied by a change in theaverage structure, or a thermal peak in the DSC measurement. It involves a dynamic freezing processwith broken ergodicity, during which nano-sized martensite domains are frozen. More interestingly,the seemingly “non-martensitic” strain glass exhibits unexpected properties: shape memory effect andsuperelasticity, like a normal martensitic alloy. Strain glass bears a striking similarity with other twoclasses of glasses: cluster-spin glass and ferroelectric relaxor. These ferroic-transition-derived glassescan be considered as a more general class of glass: ferroic glass. The finding of strain glass mayprovide new opportunities for martensite research from both fundamental side and application side
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.583.67.pdf
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