Redistribution behavior of constitutional elements at an initial crystallization stage in the Zr_65Al_7.5Ni_10Cu_17.5 glassy alloy
Redistribution behavior of constitutional elements at an initial crystallization stage in the Zr_65Al_7.5Ni_10Cu_17.5 glassy alloy
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Zr_65Al_7.5Ni_10Cu_17.5非晶合金晶化初期成分元素的再分布行为
DOI：
10.1557/jmr.2001.0008
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发表时间：
2001
影响因子：
2.7
通讯作者：
A. Inoue
中科院分区：
文献类型：
--
作者：
J. Saida;M. Matsushita;A. Inoue
研究了低氧含量（低于400 ppm mass%）的Zr_（65）Al_（7.5）Ni_（10）Cu_（17.5）非晶合金从非晶相到Zr_（2Ni）相的转变行为。晶化初期析出的主要是单面心立方Zr_2Ni相。在晶化温度附近退火的样品中，Zr_2Ni颗粒呈立方体形，粒径在300 ~ 500 nm之间，呈孤立状态。Zr和Ni在Zr_2Ni相中有明显的再分布。此外，还发现Zr_2Ni相排斥了Cu和Al。Zr_2Ni相和剩余玻璃相之间Zr、Al、Ni和Cu的成分差在1.5 ~ 5at.%之间。这强烈表明，这种显着的再分配的组成元素抑制结晶相的成核和生长。它是Zr-Al-Ni-Cu合金玻璃态稳定的重要因素之一。
We investigated the transformation behavior from glassy to Zr_2Ni phase in the Zr_65Al_7.5Ni_10Cu_17.5 glassy alloy with a low oxygen content below 400 ppm mass%. The mostly single face centered cubic Zr_2Ni phase precipitated as a primary phase at the initial crystallization stage. The Zr_2Ni particles had a cubical morphology in the diameter range of 300 to 500 nm and were in an isolated state for the sample annealed at the temperature near crystallization temperature. A significant redistribution leading to the enrichment of Zr and Ni into the Zr_2Ni phase is confirmed. Moreover, it is recognized that Cu and Al are rejected from the Zr_2Ni phase. The compositional differences of Zr, Al, Ni, and Cu between the Zr_2Ni and remaining glassy phases are in the range of 1.5 to 5 at.%. It is strongly suggested that such a significant redistribution of the constitutional elements restrains the nucleation and growth of crystalline phases. It is one of the important factors for the stabilization of the glassy state in Zr–Al–Ni–Cu alloy.