Fe-Si-B-Cu体系中原位析出非晶/晶体复合粉末的制备与性能研究  

In situ Formation of Amorphous-Core/Crystalline-Shell Composite Powder in Liquid Immiscible Fe-Si-B-Cu System

作　　者：刘兴军[1,2] 朱家华 郁炎[1] 张锦彬[1] 杨水源[1] 王翠萍[1] Liu Xingjun;Zhu Jiahua;Yu Yan;Zhang Jinbin;Yang Shuiyuan;Wang Cuiping(College of Materials and Fujian Provincial Key Laboratory of Materials Genome,Xiamen University,Xiamen 361005,China;Department of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen 518055,China)

机构地区：[1]厦门大学,福建省材料基因工程重点实验室,福建厦门361005 [2]哈尔滨工业大学,广东深圳518055

出　　处：《稀有金属材料与工程》2020年第1期109-115,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51471138,51771158)。

摘　　要：本研究基于相图计算的CALPHAD方法和超音雾化技术,设计并制备了具有典型核/壳结构的(Fe0.75Si0.1B0.15)100-xCux(x=0,30,45,55,65,at%)非晶/晶体复合粉末。实验研究了该系列晶体/非晶复合粉体的显微组织,热稳定性,形成机理和磁性能。结果表明:本研究制备的复合粉体均由分布在核层的富FeSiB非晶相和壳层的富Cu相组成。磁滞回线结果表明,随着Cu含量的增加,饱和磁化强度呈线性关系逐渐降低,但对矫顽力的影响并不明显。该类非晶/晶体复合粉体的形成过程为:(1)高温下富Cu相和富FeSiB相的液相分离现象诱发形成核/壳组织;(2)由于富Cu相的玻璃形成能力远低于富FeSiB相,在超音雾化过程中,富FeSiB相从液态被冻结为非晶态,最终形成具有核/壳结构的非晶/晶体复合粉体。Based on the CALPHAD(Calculated of Phase Diagrams)approach,micro-scale amorphous/crystalline composite powders of(Fe0.75 Si0.1 B0.15100-xCux(x=30,45,55,65,at%)with core/shell microstructure were designed and successfully fabricated by using the gas atomization method.The obtained gas-atomized powder exhibits a Fe-Si-B-rich amorphous-core/Cu-rich crystalline-shell composite microstructure.Results indicate that the coercive force of the composite powders is almost the same as that of Fe75 Si10 B15 amorphous powder,but their saturation magnetization decreases with increasing Cu concentration.The formation mechanism of such amorphous-core/crystalline-shell composite powders is originated from the occurrence of liquid phase separation at high temperature and the different glass-forming ability(GFA)of the two separated liquids(Cu-rich and FeSiB-rich)during the rapid solidification process.

关 键 词：非晶合金 CALPHAD方法 显微组织 液相分离 复合材料 

分 类 号：TB383.3[一般工业技术—材料科学与工程] TG139.8[金属学及工艺—合金]