Mechanism of active dissolution of nanocrystalline Fe-Si-B-P-Cu soft magnetic alloys
Mechanism of active dissolution of nanocrystalline Fe-Si-B-P-Cu soft magnetic alloys
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纳米晶Fe-Si-B-P-Cu软磁合金的主动溶解机理
DOI：
10.1016/j.matchar.2016.08.012
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发表时间：
2016-11-01
影响因子：
4.7
通讯作者：
Hara, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Dan, Zhenhua;Qin, Fengxiang;Hara, Nobuyoshi
纳米晶Fe_（83.3）Si_3B_（10）P_3Cu_（0.7）合金具有由平均尺寸为几十纳米的α-Fe纳米晶和非晶残余相组成的异质显微结构。在698 K退火后，纳米晶合金的饱和磁通密度为1.81 T，饱和磁化率为11.8 Am（-1）。其异质非晶组织在H2SO 4中发生了活性溶解，α-Fe颗粒以阳极α-Fe颗粒与阴极非晶残留物和Cu团簇之间的微耦合胞的形式优先溶解。由于P在残余相中的富集抑制了Fe的阳极溶解，并且α-Fe颗粒充当牺牲阳极，因此非晶残余相不容易溶解。最终的残余相是无定形的，并且具有纳米多孔结构，其孔径与退火后沉淀的α-Fe晶粒的孔径相似。纳米晶Fe_（83.3）Si_（13）B_（10）P_（33）Cu_（0.7）合金的微观结构决定了合金的溶解行为。(C)2016 Elsevier Inc. All rights reserved.
Nanocrystalline Fe83.3Si3B10P3Cu0.7 alloys have a heterogeneous microstructure consisting of alpha-Fe nanocrystals with an average size of few tenths of nanometers and an amorphous residual phase. Nanocrystalline alloy annealed at 698 K has a saturated magnetic flux density of 1.81 T and coercivity of 11.8 A m(-1). Its hetero-amorphous microstructure undergoes active dissolution in H2SO4, and alpha-Fe grains are preferentially dissolved in the form of micro-coupling cells between anodic alpha-Fe grains and cathodic amorphous residue and Cu clusters. Because the P enrichment in the residual phases inhibits the anodic dissolution of Fe and the alpha-Fe grains act as sacrificial anodes, the amorphous residual phases do not readily dissolve. The final residual phase is amorphous and has a nanoporous structure with a pore size similar to that of the precipitated alpha-Fe grains after annealing. The active dissolution behavior is determined by the microstructure of nanocrystalline Fe83.3Si3B10P3Cu0.7 alloys. (C) 2016 Elsevier Inc. All rights reserved.