Strain glass in ferroelastic systems: Premartensitic tweed versus strain glass
Strain glass in ferroelastic systems: Premartensitic tweed versus strain glass
复制标题
铁弹性系统中的应变玻璃：预马氏体花呢与应变玻璃
DOI：
10.1080/14786430903074771
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发表时间：
2010-01-01
影响因子：
1.6
通讯作者：
Ding, Xiangdong
中科院分区：
文献类型：
--
作者：
Ren, Xiaobing;Wang, Yu;Ding, Xiangdong
在含缺陷的铁磁系统和铁电系统中分别观察到了自旋玻璃和铁电弛豫体。然而，目前还不清楚是否存在类似的玻璃状态在物理上平行的铁弹性（或马氏体）系统。在20世纪90年代，理论研究表明，预马氏体粗花呢可以被视为应变玻璃。然而，这一假设还没有得到实验验证。在本文中，我们提供了一个实验测试这一假设，通过测量可能的玻璃签名在两个众所周知的预马氏体花呢系统之前，他们的马氏体相变：一个Ni 63 Al 37和其他Ti 50 Ni 47 Fe 3马氏体合金。我们的实验表明，在这两个系统中的预马氏体花呢不存在玻璃签名。有没有机械磁化率/模量异常的花呢温度制度，这表明没有玻璃化转变存在。粗花呢仍然是遍历的，与冻结的玻璃不一致。这两个关键的实验表明，预马氏体花呢不是一个冻结的玻璃状态。我们表明，应变玻璃存在于铁弹/马氏体系统，但只有在含缺陷的铁弹/马氏体系统的缺陷浓度超过一个临界值。这种应变玻璃是团簇自旋玻璃或铁电弛豫体的机械模拟物，并且具有玻璃的所有特征。我们进一步表明，粗花呢相当于应变玻璃的“解冻状态”。最后，我们证明了应变玻璃的微观起源可以很容易地理解类比的行为的“含缺陷的多米诺骨牌阵列”。
Cluster-spin glass and ferroelectric relaxors have been observed in defect-containing ferromagnetic systems and ferroelectric systems, respectively. However, it is unclear whether or not an analogous glass state exists in the physically parallel ferroelastic (or martensitic) systems. In the 1990s, theoretical studies suggested that premartensitic tweed could be viewed as a strain glass. However, there has been no experimental verification of this hypothesis. In this paper, we provide an experimental test of this hypothesis by measuring the possible glass signatures in two well-known premartensitic tweed systems prior to their martensitic transformation: one Ni63Al37 and the other Ti50Ni47Fe3 martensitic alloy. Our experiments show that no glass signatures exist for the premartensitic tweed in both systems. There is no mechanical susceptibility/modulus anomaly in the tweed temperature regime, suggesting no glass transition exists. The tweed remains ergodic, inconsistent with a frozen glass. These two critical experiments show that premartensitic tweed is not a frozen glass state. We demonstrate that strain glass exists in ferroelastic/martensitic systems but only in defect-containing ferroelastic/martensitic systems with defect concentration exceeding a critical value. This strain glass is a mechanical analogue of cluster-spin glass or ferroelectric relaxors, and possesses all the features of a glass. We further show that the tweed is equivalent to an ‘unfrozen state’ of a strain glass. Finally, we demonstrate that the microscopic origin of the strain glass can be easily understood in analogy with the behavior of a ‘defect-containing domino array’.