Fe含量对Zr60Cu40-xFex相分离非晶合金组织结构、电阻性能和纳米压痕行为的影响
收稿日期: 2020-04-30
修回日期: 2020-09-16
网络出版日期: 2020-12-01
基金资助
国家自然科学基金项目(51774264);辽宁省自然科学基金项目(2019-MS-332)
Effect of Fe Content on the Microstructure, Electrical Resistivity, and Nanoindentation Behavior of Zr60Cu40-xFex Phase-Separated Metallic Glasses
Received date: 2020-04-30
Revised date: 2020-09-16
Online published: 2020-12-01
Supported by
National Natural Science Foundation of China(51774264);Natural Science Foundation of Liaoning Province(2019-MS-332)
在Zr60Cu40单相非晶合金中引入与合金次要组元Cu具有正混合焓的Fe元素，设计了Zr60Cu40-xFex相分离非晶合金，研究了Zr60Cu40-xFex三元合金的液-液相分离行为。结果表明，二元Cu-Fe合金的液态组元不混溶区域可以延伸至三元Zr60Cu40-xFex合金中；在快速凝固条件下，该合金在冷却过程中会发生液-液相分离，形成富Cu和富Fe两液相；基于Zr60Cu40-xFex合金液-液相分离凝固特征，考察了Fe含量对Zr60Cu40-xFex合金组织及相结构的影响，讨论了Zr60Cu40-xFex体系组织演变及相形成机制。Zr60Cu20Fe20合金在冷却过程中液-液相分离形成的富Zr-Cu和富Zr-Fe两液相分别发生玻璃转变，最终形成了高数量密度(1024/m3数量级)的纳米富Cu非晶粒子(尺寸为2~10 nm)分布在富Fe非晶基体上的相分离非晶合金组织。研究了该合金样品的电阻性能和纳米压痕行为，讨论了Zr60Cu20Fe20合金晶化过程的电阻反常变化行为，并分析了Zr60Cu20Fe20合金的纳米尺度相分离组织结构对剪切转变区的影响。
孙小钧 , 何杰 , 陈斌 , 赵九洲 , 江鸿翔 , 张丽丽 , 郝红日 . Fe含量对Zr60Cu40-xFex相分离非晶合金组织结构、电阻性能和纳米压痕行为的影响[J]. 金属学报, 2021 , 57(5) : 675 -683 . DOI: 10.11900/0412.1961.2020.00137
Liquid-liquid phase separation was used to design phase-separated metallic glasses with special properties. In this work, Zr60Cu40-xFex phase-separated metallic glasses were designed by partial substitution of Cu by Fe in Zr60Cu40 metallic glass. The liquid-liquid phase separation behavior of Zr60Cu40-xFex alloy was investigated. The results show that the miscibility gap of the binary Cu-Fe system can be extended into the Zr60Cu40-xFex system and that liquid-liquid phase separation into Cu-rich and Fe-rich liquids occurred during rapid cooling. On the basis of the behavior of liquid-liquid phase separation of the Zr60Cu40-xFex system, the effect of partial substitution of Cu by Fe on the microstructure and phase formation of the Zr60Cu40-xFex alloys was investigated. The microstructure evolution and the competitive mechanism of phase formation in the as-quenched Zr60Cu40-xFex alloy were discussed. For the Zr60Cu20Fe20 alloy, liquid-liquid phase separation into Cu-rich and Fe-rich liquids and then liquid-glass transition occurred during rapid cooling and resulted in a heterogeneous structure with glassy Fe-rich matrix embedded with glassy Cu-rich nanoparticles. Considering this structure, the electrical properties and nanoindentation behavior of the as-quenched Zr60Cu20Fe20 alloy were examined. The abnormal change in electrical resistivity during crystallization and the effect of nanoscale phase separation on the shear transformation zone of the Zr60Cu20Fe20 alloy were analyzed.
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