Ferroelastic Nanostructures and Nanoscale Transitions: Ferroics with Point Defects
Ferroelastic Nanostructures and Nanoscale Transitions: Ferroics with Point Defects
复制标题
DOI：
10.1557/mrs2009.234
复制
发表时间：
2009-11
期刊：
影响因子：
5
通讯作者：
X. Ren;Yu Wang;K. Otsuka;P. Lloveras;T. Castán;M. Porta;A. Planes;A. Saxena
中科院分区：
文献类型：
--
作者：
X. Ren;Yu Wang;K. Otsuka;P. Lloveras;T. Castán;M. Porta;A. Planes;A. Saxena
几十年来，在各种马氏体或铁弹性材料的马氏体相变之前，已经广泛观察到一种称为预马氏体“花呢结构”或“斑驳结构”的纳米级微结构，但其起源仍然不清楚。最近，在高掺杂的铁弹系统中也报道了类似的纳米级微结构，但它不会变成马氏体;相反，它经历了纳米级的冻结转变-“应变玻璃”转变-并被冻结成nanodomained应变玻璃状态。本文提供了一个简明的评论，最近的实验和建模/模拟的努力，导致一个统一的理解预马氏体花呢和应变玻璃。讨论表明，由于铁弹系统中随机点缺陷或掺杂物的存在，预马氏体花呢或应变玻璃的特征是纳米级准静态铁弹畴。本文综述了点缺陷诱导纳米结构和玻璃化现象的机理，并讨论了它们在铁性功能材料中的意义。
For decades, a kind of nanoscale microstructure, known as the premartensitic “tweed structure” or “mottled structure,” has been widely observed in various martensitic or ferroelastic materials prior to their martensitic transformation, but its origin has remained obscure. Recently, a similar nanoscale microstructure also has been reported in highly doped ferroelastic systems, but it does not change into martensite; instead, it undergoes a nanoscale freezing transition—“strain glass” transition—and is frozen into a nanodomained strain glass state. This article provides a concise review of the recent experimental and modeling/simulation effort that is leading to a unified understanding of both premartensitic tweed and strain glass. The discussion shows that the premartensitic tweed or strain glass is characterized by nano-sized quasistatic ferroelastic domains caused by the existence of random point defects or dopants in ferroelastic systems. The mechanisms behind the point-defect-induced nanostructures and glass phenomena will be reviewed, and their significance in ferroic functional materials will be discussed.