Strain Glass: Glassy Martensite
Strain Glass: Glassy Martensite
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DOI：
10.4028/www.scientific.net/msf.583.67
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
Yu Wang;X. Ren;K. Otsuka
中科院分区：
文献类型：
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作者：
Yu Wang;X. Ren;K. Otsuka
“玻璃”，一种冻结的无序状态，在各种各样的领域都有发现，如无定形固体、磁性合金、铁电体、超导体，甚至在生物进化的模型中。在本综述中，我们介绍了一类新的玻璃-“应变玻璃”，这是最近发现的。应变玻璃来自于马氏体系统，其中局部应变被冻结在无序配置中。应变玻璃的第一个例子是在充分研究的富Ni的Ti 50-xNi 50 +x马氏体系统中发现的，在其“非转变”组成区域（x>1.5）。与常见的马氏体相变相反，应变玻璃化转变不伴随平均结构的变化，也不伴随DSC测量中的热峰。它涉及到一个动态冻结过程与打破遍历性，在此期间，纳米尺寸的马氏体域冻结。更有趣的是，看似“非马氏体”的应变玻璃表现出意想不到的特性：形状记忆效应和超弹性，就像正常的马氏体合金一样。应变玻璃与另外两类玻璃有着惊人的相似之处：团簇自旋玻璃和铁电弛豫玻璃。这些铁性转变衍生的玻璃可以被认为是更一般的玻璃类别：铁性玻璃。应变玻璃的发现为马氏体的研究提供了新的基础和应用机遇。
“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.