正电子湮没技术研究Zr41Ti14Cu12.5Ni10Be22.5块体非晶合金的结构自由体积

Study on Structural Free-Volume in Bulk Amorphous Zr41Ti14Cu12.5Ni10Be22.5 Alloy by Positron Annihilation Techniques

摘要:

采用X射线衍射(XRD)仪、正电子湮没光谱(PAT)研究Zr41Ti14Cu12.5Ni10Be22.5块体非晶合金的结构特性。结果表明：原始制备的Zr41Ti14Cu12.5Ni10Be22.5块体非晶合金其正电子湮没寿命为176 ps(大于正电子在纯铁中点阵空位上湮没的寿命τVFe＝165 ps)。在过冷液区(T＝400 ℃)等温退火中，正电子湮没寿命随着退火时间的增加而减小。在过冷液区退火，导致 Zr41Ti14Cu12.5Ni10Be22.5块体非晶合金的结构更致密

Abstract:

The structural free-volume of the bulk amorphous Zr41Ti14Cu12.5Ni10Be22.5 alloy and the undercooled liquid range were investigated by X-ray diffraction (XRD) and positron annihilation techniques (PAT). The results show that the positron annihilation lifetime in the as-prepared Zr41Ti14Cu12.5Ni10Be22.5 is about 176 ps, indicating that the structural free-volume with a size larger than that of one lattice vacancy of pure Fe is available in the alloy. The positron annihilation lifetime decreases with increasing annealing time when the alloy is annealed at 400 oC in the undercooled liquid region, which reaches a value of 167 ps with annealing time of 300 min. The structure of the bulk amorphous Zr41Ti14Cu12.5Ni10Be22.5 alloy becomes more compact when annealed in the undercooled liquid region