Research on high-temperature mechanical properties and microstructure of powder metallurgical rhenium. (August 2022)

• Record Type: Journal Article
• Authors: Su, Hua; Yan, Xubo; Liu, Xiaowei; Ai, Yuan; Ma, Kun; Li, Rui; Zhang, Zhao; Sun, Yameng; Liu, Sheng
• Is Part Of: International journal of refractory metals & hard materials. Volume 106(2022)
• Publication Date: 2022-08
• Subjects: Rhenium -- High temperature -- Mechanical properties -- Microstructure -- Tensile fracture; 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.2022.105861
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Metallographic microscope, scanning electron microscope (SEM), electron backscatter diffraction (EBSD), X-ray diffraction analysis (XRD) and mechanical properties testing methods are used to investigate the mechanical properties and microstructure of the annealed powder metallurgical (PM) rhenium (Re) at five different temperatures (room temperature, 800 °C, 900 °C, 1000 °C, 1100 °C). The elongation and reduction of cross section of the annealed PM Re are found to decrease with increasing temperature. Specifically, the elongation and reduction of cross section are 12.5% and 14.28% at room temperature, and drop to 0.25% and 3.975% at 1100 °C. The ultimate tensile strength of the annealed PM Re is also found to decrease with the increasing temperature, while the yield strength is found to first increases and then decreases with the increasing temperature. The ultimate tensile strength and yield strength are 884 MPa and 220 MPa at room temperature, 643 MPa and 550 MPa at 800 °C, 485 MPa and 467 MPa at 1100 °C, respectively. Observed by SEM and metallographic microscope, the fracture mode is identified to be transgranular quasi-cleavage at room temperature and 800 °C, and a mixed fracture of inter-particle debonding and transgranular quasi-cleavage at 900 °C–1100 °C. Highlights: Electron backscatter diffraction (EBSD) is used to observe the microstructure of the powder metallurgy rhenium. The elongation and reduction of cross section of the powder metallurgy rhenium decrease with increasing temperature. The fracture mode of the annealed powder metallurgy rhenium changes at 900 °C.