摘要：非晶合金物理化学性能优异，具有广阔的应用前景。Fe基非晶合金因其具有低成本、高强度、高硬度、强耐腐蚀性、高热稳定性和优异软磁性能等特点，在电力电子器件、耐磨和耐蚀材料等领域获得广泛的应用。然而，相对于其它体系的非晶合金，Fe基非晶合金的形成能力（GFA）较低，不利于这一材料的应用。相似原子替代可以有效提高Fe基非晶合金GFA、力学性能和软磁性能。基于此，本工作以Fe-B-Si-Ta最佳GFA块体非晶合金的成分Fe70B16.7Si8.3Ta5为基础，通过铜模铸造、X射线衍射、热分析、纳米压痕、磁性测量等手段，系统的研究了Ni和Co替代Fe对Fe-B-Si-Ta非晶合金GFA、热稳定性、力学性能和软磁性能的影响，具体结果如下：

在Fe70B16.7Si8.3Ta5和Fe60-xCoxNi10B16.7Si8.3Ta5 (x =0、10、20和30)系列合金成分中，随着Ni的加入和Co含量的增加，非晶合金的GFA逐渐增大，形成棒状块体非晶合金的临界尺寸（dc）由Fe70B16.7Si8.3Ta5和x=0时的1 mm增加到x=10、15和20时的1.5 mm。非晶合金过冷液体的吸收焓（ΔHsup）随着Co含量的增加而逐渐增大，由x=0时的2.6 J/g增加到x=30时的8.2 J/g，可以用来表征该体系非晶合金的GFA。Fe60-xCoxNi10B16.7Si8.3Ta5系列非晶合金的硬度和弹性模量随着Ni和Co的加入在10.7-11.1 GPa和144-178 GPa之间变化，在Fe70B16.7Si8.3Ta5非晶合金中具有最大值。在本研究涉及到的非晶合金成分中，Fe60Ni10B16.7Si8.3Ta5非晶合金具有最优的综合软磁性能，其饱和磁化强度Bs和矫顽力Hc分别为：1.04 T和0.2 A/m。

综上所述，本研究得到的(Fe,Co,Ni)-B-Si-Ta新型块体非晶合金具有较强的非晶形成能力和较优的力学及软磁性能，在结构材料和功能材料领域有潜在的应用价值。

关键词：(Fe,Co,Ni)-B-Si-Ta块体非晶合金，非晶形成能力，力学性能，软磁性能

Abstract：Amorphous alloy has excellent physical and chemical properties, has a broad application prospects. Fe-based amorphous alloy is the most widely used amorphous alloy system, with low cost, high strength, high hardness, strong corrosion resistance, high thermal stability and excellent soft magnetic properties. However, their sizes are limited due to the rapid liquid cooling required for retention of amorphous structure, and this restricts their applications in some areas. With the invention of copper mold casting, a large number of Fe-based bulk amorphous alloys have been prepared. In this experiment, we used copper mold casting to cast new Fe-based alloys.

Like-atom substitution alloying is an effective method to obtain enhanced glass-forming ability (GFA) as well as improved mechanical and soft magnetic properties of Fe-based glassy alloys. The alloying effects of the like-atom substitution of Ni and Co for Fe on the various properties of Fe70B16.7Si8.3Ta5 metallic glass are investigated in this present work. New Fe-based bulk glassy alloys, namely, Fe60-xCoxNi10B16.7Si8.3Ta5 (at.%; x = 10, 20 and 30) with critical diameters up to 1.5 mm were made by means of copper mold casting. A new glass-forming ability indicator, the enthalpy of supercooled liquid, ΔHsup, can be used to assess the glass-forming ability of the like-atom type glassy alloys.  the enthalpy of supercooled liquid, has been introduced for assessment of the GFAs of these Fe-based multi-component alloys. Nano-indentation results indicate that the calculated elastic modulus and hardness of new bulk glassy alloys are lower than that of the Fe70B16.7Si8.3Ta5 alloy. Among these bulk glassy alloys, Fe70B16.7Si8.3Ta5 exhibits the large elastic modulus and hardness with values of 178±1 GPa and 12.9±0.1 GPa, respectively. All the bulk glassy alloys exhibit good soft magnetic properties with high Bs~ 0.75-1.04 T but low Hc~0.2 - 5.2 A/m. displays the optical images of the Vickers hardness indentations of Fe70B16.7Si8.3Ta5 and Fe60-xCoxNi10B16.7Si8.3Ta5(x=0, 10 and 30) bulk glassy alloys, The generation of a number of slip markings and the absence of appreciable cracking indicate that the Fe-based bulk glassy alloys are not extremely brittle.