Strain glass in doped Ti50(Ni50−xDx) (D = Co, Cr, Mn) alloys: Implication for the generality of strain glass in defect-containing ferroelastic systems
Strain glass in doped Ti50(Ni50−xDx) (D = Co, Cr, Mn) alloys: Implication for the generality of strain glass in defect-containing ferroelastic systems
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DOI：
10.1016/j.actamat.2010.06.019
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发表时间：
2010-09
期刊：
影响因子：
9.4
通讯作者：
Yumei Zhou;D. Xue;Xiangdong Ding;Yu Wang;J. Zhang;Zhen Zhang;Dong Wang;K. Otsuka;Jun Sun-Jun-Su
中科院分区：
文献类型：
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作者：
Yumei Zhou;D. Xue;Xiangdong Ding;Yu Wang;J. Zhang;Zhen Zhang;Dong Wang;K. Otsuka;Jun Sun-Jun-Su
应变玻璃是最近在富镍钛镍铁弹性合金中发现的一种新的玻璃态。然而，目前尚不清楚应变玻璃是否可以在广泛的铁弹性系统中找到。在这里，我们研究了三种不同的缺陷掺杂体系 Ti50(Ni50−xDx) (D=Co, Cr, Mn) 的转变行为，发现它们的转变行为作为缺陷浓度 x 的函数具有惊人的相似性。在所有这些系统中，都存在一个临界掺杂水平 xcat，其跃迁行为显示出有趣的交叉。当 x<xc 时，这些材料会发生马氏体转变，并且转变温度随着 x 的增加而降低。然而，当x>xc时，马氏体转变被抑制并且发生应变玻璃化转变。这些结果意味着应变玻璃在含有缺陷的铁弹性系统中可能相当普遍。对修正的朗道型自由能景观的分析表明，尽管点缺陷总是有利于应变玻璃的形成，但要真正形成应变玻璃，它们需要破坏系统的马氏体的稳定性。
Strain glass is a new glassy state discovered recently in Ni-rich Ti–Ni ferroelastic alloys. However, it remains unclear whether or not strain glass can be found in a wide range of ferroelastic systems. Here, we investigated the transition behavior of three different defect-doped systems Ti50(Ni50−xDx) (D=Co, Cr, Mn) and found a striking similarity in their transition behavior as a function of defect concentration x. In all these systems, there exists a critical doping level xcat which the transition behavior shows an interesting crossover. At x<xc, these materials undergo a martensitic transition and the transition temperature decreases with increasing x. However, at x>xc, the martensitic transition is suppressed and a strain glass transition occurs. These results imply that strain glass may be quite general in defect-containing ferroelastic systems. An analysis with a modified Landau-type free energy landscape suggests that although point defects always favor the formation of strain glass, to actually form a strain glass they need to destabilize the martensite of the system.