(1. 陕西理工大学 材料科学与工程学院，汉中 723000；
2. 陕西理工大学 矿渣综合利用环保技术国家地方联合工程实验室，汉中 723000)
摘 要: 设计开发了一种非等原子(FeCoNiCr)100-xMnx(x=0, 12, 20)高熵合金的制备工艺。结果表明：采用真空热压烧结技术制备的含Mn型(FeCoNiCr)100-xMnx合金由面心立方(FCC)和体心立方(BCC)相组成，其中有大量的纳米级金属间化合物析出。经650 ℃退火1h后，(FeCoNiCr)88Mn12合金的综合力学性能最佳，压缩屈服强度为873.65 MPa，极限抗压强度为1813.98 MPa，断裂应变为41.03%，弯曲强度为1573.69 MPa，断裂韧性为49.45 MPa·m1/2。优异的力学性能归因于BCC相的强化作用以及低堆垛层错能区域所形成的大量退火孪晶。孪晶诱导塑性(TWIP)辅助的非等原子双相高熵合金设计理念，为高熵合金成分设计提供了一种新的思路。
关键字: 高熵合金；微观组织；力学性能；第二相强化；退火孪晶
（1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China;
2. National & Local Joint Engineering Laboratory for Environmental Protection Technology for Comprehensive Utilization of Slag, Shaanxi University of Technology, Hanzhong 723000, China）
Abstract:The Non-equiatomic (FeCoNiCr)100-xMnx(x=0, 12, 20) high-entropy alloys were studied. The results indicate that (FeCoNiCr)100-xMnx alloys containing Mn prepared by vacuum hot pressing sintering present dual-phase microstructure compose of the face centered cubic (FCC)/body centered cubic (BCC) phases, in which a lot of nanometer intermetallic compounds precipitate. The (FeCoNiCr)88Mn12 alloy after annealed at 650 ℃ for 1 h has the best comprehensive mechanical properties, with compressive yield strength of 873.65 MPa, ultimate compressive strength of 1813.98 MPa, fracture strain of 41.03%, flexural strength of 1573.69 MPa and fracture toughness of 49.45 MPa·m1/2. The excellent comprehensive mechanical properties are attributed to the second phase strengthening effect of BCC phases and a large number of annealing twins form in the low stacking fault energy region. The design concept of TWIP-assisted non-equiatomic dual-phase high-entropy alloys can provide a new idea for the composition design of high-entropy alloys.
Key words: high-entropy alloy; microstructure; mechanical properties; second phase strengthening; annealing twin
