Enhanced soft-magnetic and corrosion properties of Fe-based bulk glassy alloys with improved plasticity through the addition of Cr
Enhanced soft-magnetic and corrosion properties of Fe-based bulk glassy alloys with improved plasticity through the addition of Cr
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DOI：
10.1016/j.jallcom.2007.07.117
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发表时间：
2008-08
影响因子：
6.2
通讯作者：
Z. Long;Y. Shao;G. Xie;Ping Zhang;B. Shen;A. Inoue
中科院分区：
文献类型：
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作者：
Z. Long;Y. Shao;G. Xie;Ping Zhang;B. Shen;A. Inoue
研究了 Cr 添加对 Fe-Co-B-Si-Nb 大块非晶合金 (BGA) 的玻璃形成能力 (GFA)、耐腐蚀性以及磁性和机械性能的影响。除了 GFA 略有下降外，Cr 的添加还导致该合金在研究的成分范围内提高了耐腐蚀性，并改善了软磁性能和机械性能。采用铜模铸造技术生产直径达 4mm 的 BGA 棒。这些非晶合金表现出相当高的饱和磁化强度（0.811-1.040T）、低矫顽力（0.6-1.7A/m）、在1A/m磁场下1kHz时的高有效磁导率（2.37-3.41）×104（1kHz）和极低的饱和磁致伸缩（0.43-4.17）×10−6（0.43-4.17）×10−6。这些BGA还具有4010-4274MPa的超高断裂强度、200-215GPa的杨氏模量、约2%的弹性应变和达到0.7%的塑性应变。此外，随着Cr含量从0增加到4at.%，玻璃合金棒在SO2污染的模拟工业环境中的腐蚀速率和腐蚀电流密度分别从3.47×10−2到9.2×10−3mm/年和1.5×10−5到6.7×10−7A/cm2显着下降，表明Cr的添加对提高耐腐蚀性能有效。此外，还讨论了铁基 BGA 具有高 GFA、明显的塑性应变、良好的耐腐蚀性和优异的软磁性能的机制。
The influence of Cr addition on glass-forming ability (GFA), corrosion resistance, and magnetic and mechanical properties of the Fe–Co–B–Si–Nb bulk glassy alloy (BGA) has been investigated. Except for a slight decrease in its GFA, the Cr addition caused an increase of corrosion resistance as well as an improvement of soft-magnetic properties and mechanical behaviors for this alloy within the composition range studied. BGA rods with diameters up to 4mm were produced by copper mold casting technique. These glassy alloys exhibit a rather high saturation magnetization of 0.811–1.040T, low coercive force of 0.6–1.7A/m, high effective permeability of (2.37–3.41)×104at 1kHz under a field of 1A/m, and extremely low saturation magnetostriction of (0.43–4.17)×10−6. These BGAs also possess ultrahigh fracture strength of 4010–4274MPa, Young's modulus of 200–215GPa, elastic strain of about 2% and plastic strain reaching 0.7%. Moreover, the corrosion rate and corrosion current density of the glassy alloy rods in simulated industrial environments contaminated with SO2decreased significantly from 3.47×10−2to 9.2×10−3mm/year and 1.5×10−5to 6.7×10−7A/cm2, respectively, with increasing Cr content from 0 to 4at.%, illustrating that the addition of Cr is effective in increasing the corrosion resistance. Furthermore, the mechanisms for the high GFA, distinct plasticity strain, good corrosion resistance, and excellent soft-magnetic properties of the Fe-based BGAs are discussed.