摘要：研究了Co-Zr二元相图上4个共晶点成分配方Co₉₀Zr₁₀、Co₅₃Zr₄₇、Co₃₅Zr₆₅和Co₂₁Zr₇₉在球磨条件下的非晶态合金形成能力。采用X射线衍射和差热分析(DTA)对粉末的结构及热稳定性进行了分析。XRD分析结果表明,4种配方在一定的球磨时间内都能形成非晶态合金,其中非晶形成能力最强的为Co₃₅Zr₆₅。DTA分析结果表明,该合金系具有较高的热稳定性,并具有较高的非晶形成能力。球磨时间对非晶的形成有重要影响,球磨时间过长,使形成的非晶态合金粉体反而向晶体转化。

关键词：机械合金化;非晶态合金;非晶形成准则;热稳定性;

Abstract: The glass forming ability of four eutectic compositions such as Co₉₀Zr₁₀,Co₅₃Zr₄₇,Co₃₅Zr₆₅ and Co₂₁Zr₇₉ based on the Co-Zr phase diagram isstudied under mechanical alloying conditions. The structure and the ther-mal stability of the amorphous powder prepared by mechanical alloying(MA) is investigated by X-ray diffraction(XRD) and different thermal ana-lyzed(DTA). XRD results show that all the alloys formed amorphous alloys.Co₃₅Zr₆₅ alloy play the best glass forming ability among four alloys. The re-sults analyzed by DTA show that amorphous powders have the high ther-mal stability and have the high glass forming ability.The milling time playsan important role in formation of Co-Zr amorphous alloys. If the millingtime is too long, the formed amorphous alloys will turn to crystallization.

Key words: mechanical alloying; amorphous alloy; glass forming criteria;thermal stability