Sarkar Shampa, Ren Xiaobing, Otsuka Kazuhiro
Materials Physics Group, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan.
Phys Rev Lett. 2005 Nov 11;95(20):205702. doi: 10.1103/PhysRevLett.95.205702. Epub 2005 Nov 8.
We report here "strain glass," a new glassy phenomenon in ferroelastic-martensitic system of Ni-rich intermetallic Ti(50-x)Ni(50+x) (x > 1), where local strain is frozen in disordered configuration below a critical temperature Tg. The ac elastic modulus shows a minimum at Tg, which exhibits logarithmic frequency dependence following Vogel-Fulcher relationship, and the corresponding internal friction shows a frequency-dependent peak located at a lower temperature. In situ high-resolution transmission electron microscopy observations reveal uncorrelated nanoclusters of martensiticlike phase, randomly frozen in the otherwise untransformed parentlike matrix. Being parallel to spin glass and relaxor, strain glass may shed new light on the fundamental physics of glass and lead to the discovery of novel properties.
我们在此报告“应变玻璃”，这是一种在富镍金属间化合物Ti(50 - x)Ni(50 + x)（x > 1）的铁弹性 - 马氏体系统中出现的新型玻璃态现象，其中局部应变在低于临界温度Tg时冻结在无序构型中。交流弹性模量在Tg处出现最小值，其遵循Vogel - Fulcher关系呈现对数频率依赖性，并且相应的内耗在较低温度处出现频率依赖性峰值。原位高分辨率透射电子显微镜观察揭示了类似马氏体相的不相关纳米团簇，它们随机冻结在未转变的母相基质中。与自旋玻璃和弛豫体类似，应变玻璃可能为玻璃的基础物理带来新的启示，并导致发现新的性质。
