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  

Effect of Fe Content on the Microstructure, Electrical Resistivity, and Nanoindentation Behavior of ZrCuFe Phase-Separated Metallic Glasses

作　　者：孙小钧 何杰[1,2] 陈斌[1,2] 赵九洲[1,2] 江鸿翔[1] 张丽丽[1] 郝红日[1] SUN Xiaojun;HE Jie;CHEN Bin;ZHAO Jiuzhou;JIANG Hongxiang;ZHANG Lili;HAO Hongri(Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《金属学报》2021年第5期675-683,共9页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目Nos.51774264、51974288和51574216;辽宁省自然科学基金项目No.2019-MS-332。

摘　　要：在Zu60Cu40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Zu60Cu20Fe20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。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 Ferich 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.

关 键 词：液-液相分离 难混溶合金 金属玻璃 电阻行为 纳米压痕 

分 类 号：TG113.11[金属学及工艺—物理冶金]