A two-phase ultrafine-grained NbMoTaWV refractory high entropy alloy with prominent compressive properties

作者：Peng, Haiyan; Kang, Zhixin; Long, Yan^*; Zhou, Li^*

来源：Vacuum, 2022, 199: 110930.

DOI：10.1016/j.vacuum.2022.110930

• Refractory high entropy alloy
• Spark plasma sintering
• Mechanical alloying

A NbMoTaWV high entropy alloy (HEA) was fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). Characterization of milled powders indicated that only a single body-centered cubic (BCC) solid solution phase was generated in the MA process. After SPS, a tetragonal (Ta,V)O-2 oxide phase precipitated from the primary BCC phase. The NbMoTaWV alloy exhibited a compressive yielding strength (sigma(y)) of 2785 MPa, compressive strength (sigma(max)) of 3661 MPa and strain to failure (epsilon(f)) of 16.2% at room temperature. The compressive yielding strength of the sintered alloy was dramatically higher compared with most previously reported HEAs. The compressive strength of NbMoTaWV alloy at 1000 ? arrived at 1978 MPa. The excellent strength at room and elevated temperatures are mostly ascribed to the fine (Ta,V)O-2 particles dispersed in the BCC matrix.

• 单位
  y; 广东技术师范学院