Zr70Ni30金属玻璃结晶特点
来源期刊：中南大学学报(自然科学版)1990年第4期
论文作者：谭树松 徐惠彬
文章页码：410 - 413
关键词：锆； 镍； 金属玻璃； 自由表面； 晶体缺陷/接触面
Key words：zirconium； nickel； metallic glass； free surfaces； crystal defects/contact surface
摘 要：用X光,光学金相显微镜对Zr70Ni30非晶箔带结晶过程进行了研究,发现Zr70Ni30非晶箔带在自由面先结晶;之后,在表面结晶向内部扩展的同时,淬火晶核开始长大。此外,发现试样退火过程表面有少量氧化,而自由表面氧化程度往往比铜轮接触面要大。氧化,结晶均从自由面开始,可能与自由面晶体缺陷较多,表面活化程度较高有关。
Abstract: The crystallization process of Zr70 Ni30 glass has been investigated systematically by means ofX-ray diffraction and optical microscopy.It was found that nucleation occurs preferentially at thefree surface of the ribbon.The crystallization front propagated from the surface inward and mean-while the quenched embryos began to grow.Moreover the sensitivity of oxidation of the free surfaceis greater than that of the contact surface during heat treatment in Perkin Elmer DSC-2 scanningcalorimeter.Crystallization and oxidation started from the free surface of the ribbon.This can berelative to the crystal defects and the higher activity of the free surface.
