采用吸铸法制备了直径为2---5 mm的[(Fe1-xCox)71.2B24Y4.8]96Nb4 (x=0, 0.1, 0.2, 0.3和0.4) 合金棒. XRD测试表明, 用适量的Co替换Fe可有效提高原始
合金 (Fe71.2B24Y4.8)96Nb4 的玻璃形成能力, 拓宽非晶形成范围. 热分析结果显示所有的非晶合金均具有高的玻璃转变温度(Tg≥850 K) 和宽广的过冷液态区 (Δ Tx≥97 K). 此外, Co的替换明显改善了原始非晶合金的软磁性能, 其中成分为[(Fe0.9Co0.1)71.2B24Y4.8]96Nb4的非晶合金的饱和磁化强度Ms达到26.6 kA/m, 矫顽力Hc仅为59 A/m.热磁实验表明, 随着Co含量的增加, 非晶合金的Curie温度不断升高, 最大值达到577 K, 与初始合金相比提高了100 K, 显著改善了原体系的热磁性能.
[(Fe1-xCox)71.2B24Y4.8]96Nb4 (x=0, 0.1, 0.2, 0.3 and 0.4) alloy rods with 2—5 mm in diameter were prepared using commercial materials and suction casting method. XRD results show that the substitution of an appropriate amount of Co for Fe can improve effectively the glass forming ability and extend considerably the composition scope for glassy formation. DTA curves indicate that all the alloys with different Co contents exhibit a high glass transition temperature (Tg≥850 K) and wide supercooled liquid region (ΔTx≥97 K). It is also observed that Co substitution for Fe enhances significantly the soft magnetic properties. For the [(Fe0.9Co0.1)71.2B24Y4.8]96Nb4 bulk metallic glass, the saturation magnetization (Ms) has a maximum value of 26.6 kA/m, while the coercivity (Hc) is only 59 A/m. In addition, the Curie temperatures of the tested alloys increase continuously with the increase of Co content, and reaches the highest value of 577 K when x=0.4, which is about 100 K higher than that of the base alloy without Co.
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