Structure-Property Correlation of High Fe-ContentFe-B-Si-Hf Bulk Glassy Alloys

doi:10.11900/0412.1961.2016.00281

Acta Metall Sin

2017, Vol. 53

Issue (3): 369-375 DOI: 10.11900/0412.1961.2016.00281

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Structure-Property Correlation of High Fe-ContentFe-B-Si-Hf Bulk Glassy Alloys

Yaoxiang GENG¹(

),Zhijie ZHANG¹,Yingmin WANG²,Jianbing QIANG²,Chuang DONG²,Haibin WANG¹,Ojied TEGUS³

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 Key Lab of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
3 Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China

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Yaoxiang GENG,Zhijie ZHANG,Yingmin WANG,Jianbing QIANG,Chuang DONG,Haibin WANG,Ojied TEGUS. Structure-Property Correlation of High Fe-ContentFe-B-Si-Hf Bulk Glassy Alloys. Acta Metall Sin, 2017, 53(3): 369-375.

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Abstract

Fe-based amorphous alloys are well known for their good magnetic properties. But these alloys were only prepared into ribbon form in early times due to their insufficient glass-forming abilities (GFAs). After first synthesized of Fe-(Al, Ga)-P-C-B bulk glassy alloy, many Fe-based bulk metallic glasses (BMGs) were synthesized. Compared with amorphous alloy ribbons, the GFA of these alloys was significantly improved, but the saturation magnetization (B_s) was less than 1.5 T. To achieve higher B_s in Fe-based amorphous alloys, the Fe content should be maximized and the metalloid and alloying elements contents should be minimized, but it makes glass formation difficult. It is difficult to reveal the effect mechanism of Fe atoms in high Fe-content amorphous alloys, due to the complexity of the amorphous structure. The present work focuses on explores the structure-property correlations of high Fe-content Fe-B-Si-Hf multi-component glassy alloys with an amorphous structure model. A series of high Fe-content alloys with the composition of [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) was produced by adding Fe atoms to the ideal cluster formula, which is based on the composition with the best glass-forming ability of [Si-B₂Fe_7.7Hf_0.3]Fe (Fe_72.5B_16.7Si_8.3Hf_2.5) for Fe-B-Si-Hf quaternary alloys. Liquid quench, thermal analysis and magnetic measurement results show that the critical rod size for glassy alloys gradually decreases from 2.5 mm to 1 mm as the number of Fe atoms increases from 0 to 2. The [Si-B₂Fe_7.7Hf_0.3]Fe+Fe₂ (Fe_76.4B_14.3Si_7.1Hf_2.2) bulk glassy alloy has a high saturation magnetization of 1.58 T and a low coercive force of 2.8 A/m. The decreasing of the glass transition temperature, the thermal stability, the glass-forming ability and the Curie temperature with increasing Fe content in Fe-B-Si-Hf glassy alloys was evaluated using a “dual-cluster” ({[Si-B₂Fe_7.7Hf_0.3]+[Fe-Fe₁₄]_x_/15}Fe) amorphous structure model. The result shows that the [Fe-Fe₁₄] cluster from the α-Fe phase plays an important role in determining the properties change for this series high Fe-content Fe-B-Si-Hf glassy alloys.

Key words: composition design Fe-B-Si-Hf bulk glassy alloy soft magnetic property "dual-cluster" model structure-property correlation

Received: 05 July 2016

Fund: Supported by National Natural Science Foundation of China (Nos.51671045 and 51601073), National Magnetic Confined Fusion Energy Development (Nos.2013GB107003 and 2015GB105003) and Fundamental Research Funds for the Central Universities (No;DUT16ZD209)

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	Articles by authors
	Yaoxiang GENG
	Zhijie ZHANG
	Yingmin WANG
	Jianbing QIANG
	Chuang DONG
	Haibin WANG
	Ojied TEGUS

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00281 OR https://www.ams.org.cn/EN/Y2017/V53/I3/369

Fig.1 XRD spectra of [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x where x=0, 1.5 and 2 in rods with a critical dimension (d_c) and x=2.5 and 3 in rods with 1 mm diameter (d) (a), and x=0, 1.5, 2, 2.5 and 3 in ribbons (b)

Fig.2 Bright field TEM image and the corresponding selected area electron diffraction (SAED) pattern (inset) of [Si-B₂Fe_7.7Hf_0.3]Fe+Fe₂ rod sample with diameter of 1 mm

Fig.3 DSC (a) and DTA (b) curves of [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) glass ribbons (T_c—Curie temperature, T_g—glass transition temperature, T_x—onset crystallization temperature, T_l—liquidus temperature)

Fig.4 Variations of T_g, T_x and reduced glass transition temperature (T_rg) against x in [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) glass alloys

Fig.5 Magnetization vs the applied magnetic field (a) and the B-H loops (b) of the [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) glass ribbons (B—magnetization, μ₀—permeability of vacuum, H—magnetic field)

Fig.6 Variations of saturation magnetizations (B_s) and Curie temperature (T_c) against x in [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) glass alloys

Table 1 Cluster formulas, corresponding compositions, critical size d_c, T_g, T_x, T_l and T_rg of [Si-B₂Fe_7.7Hf_0.3]Fe+Fe_x (x=0, 1.5, 2, 2.5 and 3) glass alloys

Fig.7 2D schematic of amorphous structure for {[Si-B₂Fe_7.7Hf_0.3]+[Fe-Fe₁₄]_x_/15}Fe glassy alloys (The face center cubic-like array of [Si-B₂(Fe, Hf)₈] and [Fe-Fe₁₄] atomic clusters are circled by black dotted lines, leaving behind the Fe glue atoms in the octahedral sites)

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