Intrinsic nanoscale inhomonegeity in metallic glass and its relation to mechanical properties

通过研究钯基和锆基合金的弛豫行为，证实了金属玻璃的脆性（=过冷液态粘度的温度依赖性）、慢β弛豫大小和纳米尺度非均匀性之间的密切关系。通过HAADF-STEM观察，新发现低能Ar离子注入可使Ar原子在金属玻璃的弱键区冻结。通过分析冻结Ar纳米粒子的尺寸和分布与合金体系和热历史的关系，可以更清楚地了解金属玻璃中纳米尺度的不均匀性。

Strong relationship among fragility (= temperature dependence of viscosity in supercooled liquid state, magnitude of the slow beta relaxation and nanoscale inhomogeneity in metallic glasses is confirmed by investigating relaxation behavior of Pd- and Zr-based alloys. By HAADF-STEM observation, it is newly found that Ar atom can be frozen in weakly bonded region of metallic glass by low energy Ar ion implantation. By analyzing dependence of size and distribution of the frozen Ar nanoparticles on the alloy system and thermal history, we can understand the nanoscale inhomogeneity in metallic glass more clearly.