Co含量对低纯Fe-B原料制备的铁基非晶合金形成能力及性能的影响
[Abstract]:In this paper, Fe-based bulk amorphous alloys were prepared from low purity FeB by vacuum non-consumable arc furnace melting and copper mold casting. On the basis of a great deal of investigation, the classical Fe-B-Y-Nb system in the FeB based Fe-base amorphous alloy system was selected as the research object. The forming ability and mechanical properties of the Fe-base bulk amorphous alloy were systematically studied by adding Co elements to the system. Effects of soft magnetic properties and corrosion resistance. The addition of Co elements was identified by means of EDS test, and the addition of Co elements was confirmed to be successful. The experimental results show that although the low purity raw material has an effect on the amorphous formation ability of the system, the fine adjustment of the composition can ensure its good amorphous formation ability. The addition of appropriate amount of Co elements played a positive role in improving the amorphous forming ability of the alloy, and the critical size of the Fe-based amorphous alloy reached 4 mm.. In terms of thermodynamic measurement, when the content of Co element is 3 at%, the classical thermodynamic criteria include the width of supercooled liquid region 螖 T _ x, and the reduced glass transition temperature T _ (rg),. The parameter 纬 shows the optimum amorphous forming ability at this composition point, which indicates that the above empirical parameters are suitable for the Fe-based amorphous alloy in this system as the criterion of the formation ability of the amorphous alloy. In terms of mechanical properties, with the increase of Co element content, the hardness of Fe68-xCoxB23Y5Nb4 (x0. 0. 5) alloy showed a trend of first increasing and then decreasing, and the overall hardness of the alloy was all above 1000Hv. When the content of Co is 3 at%, the hardness of the alloy reaches its peak value, and the yield strength of four kinds of Fe-based amorphous alloys, Fe68-xCoxB23Y5Nb4 (x0. 0. 0. 5, 3? 5), increases step by step, which indicates that on the amorphous alloy of this system, The addition of appropriate amount of Co elements has a positive effect on the improvement of mechanical properties. In addition, the addition of Co elements can also improve the soft magnetic properties of iron-based bulk amorphous alloys in Fe68-xCoxB23Y5Nb4 (x0. 5) system, decrease the coercivity of the alloys and increase the saturation magnetization of the alloys. In terms of corrosion resistance, the corrosion current density (Icorr) of the alloy is 6.55 脳 10 ~ (-6) A / cm ~ (2) and the self-corrosion point (Ecorr) is -0.95 V vs.SCE, when the content of Co element increases to 7at%. The corrosion current density of the alloy is 6.55 脳 10 ~ (-6) A / cm ~ (-2). When the content of Co is in the range of 3 at7 at%, the corrosion resistance of the amorphous alloy is superior, which indicates that the addition of proper amount of Co element can promote the corrosion resistance of the Fe-based bulk amorphous alloy. Related studies have shown that it is precisely because the amorphous alloy is more homogeneous in microstructure than the conventional crystalline alloy, without grain boundary defects, dislocations, inclusions, dispersion of the second phase or other physical defects, The results show that the mechanical properties, soft magnetic properties and corrosion resistance of Fe-based bulk amorphous alloys are relatively excellent. The properties of the Fe-based amorphous alloy were optimized by adding Co elements, and the preparation cost was reduced to a certain extent.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TG139.8
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