Microstructure and mechanical properties of the TiZrNbMoTa refractory high-entropy alloy produced by mechanical alloying and spark plasma sintering. (December 2020)

• Record Type: Journal Article
• Authors: Zhu, Chenglong; Li, Zhanjiang; Hong, Chunfu; Dai, Pinqiang; Chen, Junfeng
• Is Part Of: International journal of refractory metals & hard materials. Volume 93(2020)
• Publication Date: 2020-12
• Subjects: Refractory high-entropy alloy -- Powder metallurgy -- Microstructure -- Mechanical properties; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2020.105357
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: The equiatomic refractory high entropy alloy (HEA) TiZrNbMoTa was investigated. The alloyed powders with face-centered cubic (FCC) structured solid solution phase were prepared by mechanical alloying (MA) and then sintered by spark plasma sintering (SPS) at 1300, 1400, 1500, and 1600 °C. The microstructure and mechanical properties of the bulk alloy were investigated. The body-centered cubic (BCC) structured solid solution phase and the ZrO2 phase precipitated from the FCC structured solid solution phase during cool-down from sintering. The highest compression fracture strength (3759 MPa) and fracture strain (12.1%) were obtained in the refractory HEA sintered at 1400 °C. The grain boundary strengthening, precipitation strengthening, solid solution strengthening, transformation-induced plastic (TRIP) effect, and toughening effect of the ZrO2 phase are the important factors for the high strength and ducitily of the refractory HEA prepared in this study. Highlights: TiZrNbMoTa refractory HEA was prepared by powder metallurgy (MA and SPS). The TiZrNbMoTa refractory HEA with dual-phase (FCC and BCC) solid solution structure was successfully prepared. TiZrNbMoTa refractory HEA exhibits excellent mechanical properties superior than the refractory HEAs prepared by arc-melting.