在铜模铸造条件下制备了直径2.5 mm的Nd61Fe30Zn9块状非晶合金. 在普通DSC 条件下, 没有观察到这种合金的玻璃转变温度, 晶化温度为730 K, 比Nd60Fe30Al10非晶合金的晶化温度低约70 K, 因此该合金的热稳定性较低. 熔化行为分析表明,合金Nd61Fe30Zn9的熔化过程为单峰吸热过程,且熔化区间仅为54 K, 说明该合金的成分接近合金的共晶成分, 但母合金的自然凝固组织不具有共晶凝固特点,表现为粗大的枝晶状组织. 讨论了成分和组织对合金非晶形成能力的影响.
A new Nd61Fe30Zn9 bulk metallic glass with a diameter of 2.5 mm was obtained using copper mold casting. No glass transition temperature or supercooled liquid region was observed by using conventional DSC--7 facility. The crystallization temperature for the bulk sample is 730 K, which is about 70 K lower than that of Nd60Fe30Al10 bulk metallic glass. The melting characteristics of Nd61Fe30Zn9 alloy show that its compositional is at a eutectic point, but the alloys exhibit non--eutectic microstructure due to high tendency of undercooled ability.
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