形成能力的影响
(太原重型机械学院 材料科学与工程分院，太原 030024)
摘 要: 研究了反复熔炼对Zr60Al15Ni25和Zr65Al7.5Ni10Cu17.5合金的玻璃形成能力的影响。 DSC分析表明， 随着熔炼次数的增多， Zr60Al15Ni25非晶合金的玻璃转变温度和晶化开始温度都提高，而Zr65Al7.5Ni10Cu17.5非晶合金的特征温度基本没有发生变化。 Zr60Al15Ni25合金的熔化焓由于反复熔炼而降低，在热力学上有利于非晶相的形成。 根据反复熔炼对铸锭凝固组织进而对合金熔体中的短程序的影响， 讨论了玻璃形成能力的变化及原子间的结合力对短程序尺寸的影响， 分析了2种合金对反复熔炼处理的敏感性的不同。
关键字: 大块非晶合金; 玻璃形成能力; 短程序
（Department of Materials Science and Engineering,
Taiyuan Heavy Machinery Institute,Taiyuan 030024, China）
Abstract:The effects of repetitive melting on the glass forming ability (GFA) of Zr60Al15Ni25 and Zr65Al7.5Ni10Cu17.5 were investigated. The results of DSC curves indicate that the glass transition temperature and the crystallization onset temperature of Zr60Al15Ni25 alloy increase as melting times increase. However, the characteristic temperatures of Zr65Al7.5Ni10Cu17.5 alloy scarcely change after repetitive melting. The reducing of fusion enthalpy of Zr60Al15Ni25 alloy after repetitive melting contributes to the suppressing of the nucleation of the primary phase. The improvement of the GFA of Zr60Al15Ni25 alloy is attributed to the smaller size of short-range orders, inheriting from the solidification structure of the ingot, after repetitive melting. Based on the fact that the attraction interaction of different species atoms controls the size of short-range orders in the liquid, the different sensitivity of the two alloys to repetitive melting was discussed.
Key words: bulk glassy alloy; glass forming ability; short-range
