Primary transformation kinetics in Zr-Al-Ni-Cu-Pd bulk metallic glass correlated with relaxation, State
Primary transformation kinetics in Zr-Al-Ni-Cu-Pd bulk metallic glass correlated with relaxation, State
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Zr-Al-Ni-Cu-Pd 大块金属玻璃中的初级转变动力学与弛豫、状态相关
DOI：
10.1007/s11661-012-1321-3
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J.Saida and A.D.Setyawan
中科院分区：
文献类型：
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作者：
榊原甫;佐藤義倫;伊野浩介;伊藤暁彦;塗溶;後藤孝;末永智一;田路和幸;A. Watanabe;J.Saida and A.D.Setyawan
研究了Zr65Al7.5Ni10Cu12.5Pd5大块金属玻璃（BMG）在不同弛豫状态下纳米二十面体准晶（QC）相形成的初次转变动力学。一个不太放松（非松弛）BMG表现出更高的激活能的玻璃态结构中的原子扩散比一个放松的，这代表了在主相与松弛状态的成核和晶粒生长动力学的变化。实际上，在结晶温度附近的QC颗粒的晶粒生长速率在较低弛豫的BMG中约为1 × 10 - 9 m/s，其小于弛豫BMG中的一半。相比之下，计算出的均匀成核率显着增加，在较不放松的样品。随着前期转化体积分数的增加，其转化率逐渐增大。结果表明，非晶合金的弛豫状态对一次相变动力学有显著影响。目前的研究还表明，在BMG的工业应用的结构控制的弛豫状态的发展的必要性。
The primary transformation kinetics of nanoicosahedral quasicrystalline (QC) phase formation were investigated in Zr65Al7.5Ni10Cu12.5Pd5bulk metallic glass (BMG) in various relaxation states. A less relaxed (unrelaxed) BMG exhibited higher activation energy for atomic diffusion in the glassy structure than that of a relaxed one, which represents a change in the nucleation and grain growth kinetics of the primary phase with the relaxation state. Actually, the grain growth rate of a QC particle near the crystallization temperature was approximately 1 × 10−9m/s in the less relaxed BMGs, which was less than half of that in the relaxed BMGs. In contrast, the calculated homogeneous nucleation rate significantly increased in the less relaxed samples. It increased with the volume fraction transformed in the early stage. It is concluded that the relaxation state of glassy alloys markedly affects the primary transformation kinetics. The current study also indicates a necessity of development of the relaxation state for structure controlling in industrial applications of BMGs.