Nb含量对Fe0.5MnNi1.5CrNb x 高熵合金微观结构和力学性能的影响

Effect of Nb Addition on Microstructure and Mechanical Properties of Fe0.5MnNi1.5CrNb x High-Entropy Alloys

摘要:

采用真空感应熔炼法制备了Fe_0.5MnNi_1.5CrNb_x（x=0，0.05，0.1，摩尔比）高熵合金，并分析了不同Nb含量对其组织和力学性能的影响。结果表明，不含Nb元素的合金具有单相fcc结构，其抗拉强度和断裂延伸率（即延展性）分别为519 MPa和47%。添加少量的Nb(x=0.05)后出现(200)织构和少量Fe₂Nb Laves相，合金的延展性增加到55%，并且抗拉强度增加到570 MPa。当Nb含量增加到x=0.1时，织构减少，而Fe₂Nb Laves相增多，抗拉强度和延展性分别为650 MPa和45%。

Abstract:

Fe_0.5MnNi_1.5CrNb_x (x=0, 0.05, 0.1, molar ratio) high-entropy alloys were prepared by vacuum induction melting. The effect of Nb content on the microstructure and mechanical properties of the new alloy was analyzed. The results show that the Nb-free alloy has a single-phase fcc structure, and its tensile strength and elongation to failure (i.e., ductility) are 519 MPa and 47%, respectively. With the addition of Nb (x=0.05), the (200) texture and Fe₂Nb Laves phase appear. The ductility of alloy increases to 55%, while the tensile strength increases to 570 MPa. When the molar ratio of Nb increases to 0.1, the texture diminishes, whereas the volume fraction of the Fe₂Nb phase is increased. The resultant tensile strength and ductility are 650 MPa and 45%, respectively.