均匀化处理对Fe基中熵合金组织及力学性能影响

采用水冷铜坩埚磁悬浮熔炼-铜模负压吸铸法制备了(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)_98.5Y_1.5(Y=Cu、Ag)、(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5中熵合金. 通过建立均匀化动力学方程,研究了均匀化温度和时间对力学性能的影响.对(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)_98.5Y_1.5(Y=Cu、Ag)、(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5中熵合金分别在873、973、1 073、1 173、1 273 K进行6 h均匀化处理,研究其组织结构和压缩性能的关系.结果表明:通过施加均匀化处理使合金元素均匀分布、偏析显著减少,1 173 K均匀化处理后合金具有好的相稳定性,仍为fcc结构.在1 173 K时,(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5中熵合金的压缩力学性能最优,其抗压强度及塑性应变分别为3 992.4 MPa和35.75%,且实验结果与均匀化扩散动力学方程计算预测相符.

Effect of homogenization treatment on the microstructure and mechanical properties of Fe-based medium entropy alloys

The (Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)_98.5Y_1.5(Y=Cu、Ag)、(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5 were prepared by water-cooled copper crucible magnetic levitation melting-copper mold negative pressure suction casting method.The effect of homogenization temperature and time on mechanical properties was studied by establishing the uniformization kinetic equation.(Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)_98.5Y_1.5(Y=Cu、Ag) and (Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5 medium entropy alloys were homogenized at 873, 973, 1 073, 1 173, 1 273 K, respectively. The relationshipwas investigatedbetween its organizational structure and compression performance. The results showed that the uniform distribution of alloying elements is applied and the segregation is significantly reduced, The homogenization alloy is phase stable and still has an fcc structure at 1 173 K, and the compressive mechanical properties of the entropy alloy of (Fe_63.3Mn₁₄Si_9.1Cr_9.8C_3.8)₉₇Cu_1.5Ag_1.5 is the best at 1 173 K, and the compressive strength and plastic strain were 3 992.4 MPa and 35.75%, respectively, and the experimental results were consistent with the calculational prediction of the equation of homogenization diffusion kinetics.