Comparative studies on densification behavior, microstructure, mechanical properties and oxidation resistance of Mo-12Si-10B and Mo3Si-free Mo-26Nb-12Si-10B alloys. (November 2019)

• Record Type: Journal Article
• Authors: Yang, Tao; Guo, Xiping
• Is Part Of: International journal of refractory metals & hard materials. Volume 84(2019)
• Publication Date: 2019-11
• Subjects: Mo-Nb-Si-B alloy -- Densification behavior -- Mechanical property -- Oxidation resistance; 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.2019.104993
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Two bulk Mo-Si-B based alloys (Mo-12Si-10B and Mo-26Nb-12Si-10B (at.%), abbreviated as 0Nb and 26Nb alloy respectively) were fabricated by mechanical alloying and then hot pressing. Comparative studies were carried out on the densification behavior, microstructure, room-temperature fracture toughness, elevated temperature compression and oxidation resistance of these two alloys. The results showed that alloy 0Nb was composed of (Mo), Mo3 Si and Mo5 SiB2, while alloy 26Nb was free of Mo3 Si and had higher (Mo) content and a little γNb5 Si3 . Compared to the alloy 0Nb, alloy 26Nb presented better compactibility, higher room-temperature fracture toughness (8.84 ± 0.17 vs. 6.77 ± 0.20 MPa·m 1/2 ) and elevated temperature compression strength (851.7 ± 11.7 vs. 644.2 ± 10.2 MPa) but worse oxidation resistance. Highlights: Mo-12Si-10B and Mo3 Si-free Mo-26Nb-12Si-10B bulk alloys are prepared by MA and HP. Mo3 Si-free alloy presents better compactibility. Mo3 Si-free alloy presents higher room-temperature fracture toughness. Mo3 Si-free alloy presents higher elevated temperature compression strength. Mo3 Si-free alloy presents worse oxidation resistance.