Zr基大块非晶合金成分的等电子浓度和等原子尺寸判据

THE ELECTRON CONCENTRATION-CONSTANT AND ATOMIC SIZE-CONSTANT CRITERION IN Zr-BASED BULK METALLIC GLASSES

制备了 ６种合金Ｚｒ６５．５Ａ１５．６Ｎｉ６.５Ｃｕ２２．４，Ｚｒ６５．３Ａｌ６．５Ｎｉ８．２Ｃｕ２０，Ｚｒ６５Ａｌ７．５Ｎｉ１０Ｃｕ１７．５，Ｚｒ６４.８Ａｌ８.３Ｎｉ１１.４Ｃｕ１５.５，Ｚｒ６４.５Ａｌ９.２Ｎｉ１３.２Ｃｕ１３.１ 和 Ｚｒ６３.８Ａｌ１１.４Ｎｉ１７.２Ｃｕ７.６，共晶成分位于合金 Ｚｒ６４.５Ａｌ９.２Ｎｉ１３.２Ｃｕ１３.１ 和合金 Ｚｒ６３.８Ａｌ１１.４Ｎｉ１７.２Ｃｕ７.６的成分之间 这６种合金均显示了非晶相的形成和较宽的过冷液相区范围 ＡＴｘ 值．以及较大的约化玻璃转变温度 Ｔｒｇ 值，除合金Ｚｒ６３.８Ａｌ１１.４Ｎｉ１７．２Ｃｕ７.６的Ｔｘ值为 ８７ Ｋ外．其余５种成分合金的Ｔｘ值均在 ９７ Ｋ以上．最宽的达 １０５ Ｋ，表明这 ６种合金是一个具有大玻璃形成能力和高热稳定性的非晶合金系列，合金Ｚｕ６３.８Ａｌ１１.４Ｎｉ１７.２Ｃｕ１７.６是 ６种合金中玻璃形成能力和热稳定性最高的．其 Ｔｇ、Ｔｘ和Ｔｒｇ值最高Ｉｎｏｕｅ非品合金Ｚｒ６５Ａｋ７.５Ｎｉ１０Ｃｕ１７.５并不是最佳非晶成分，提出以等电子浓度和等原子尺寸规律作为设计大块非晶合金成分的判据。

A series of amorphous alloys, Zr65.5A15.6 Ni6 .5Cu22.4, Zr65.3A16.5 Ni8.2Cu20, Zr65AI7.5Ni10Cu17.5, Zr64.8Al8.3Ni11.4Cu15.5, Zr64.5AI9.2Ni13.2Cu13.1 and Zr63.8Al11.4Ni17.2Cu7.6 were designed based on e/a-constant and atomic-size constant criteria. These alloy samples exhibit wide supercooled liquid regions Tx (87-105 K) and large reduced glass transition temperature Trg (0.58-0.61). Among the six samples, sample Zr65.3Al6.5Ni8.2Cu20 has the largest Tx value, sample Zr63.8Al11.4Ni17.2Cu7.6 has the highest Tg, Tx, and Trg values and hence highest glass forming ability and thermal stability, It is also suggested that the eutectic point is between samples Zr64.5A19.2Ni13.2Cu13.1 and Zr63.8A111.4Ni17.2Cu7.6. The well-known Zr65A17.5Ni10Cu17.5 Inoue alloy is not the best BMG composition. The results confirm the correctness of our glass forming criteria.