ZrTiO4 secondary phase effects on ductility and toughness of molybdenum alloys

• Published in: Materials letters Vol. 307; p. 131077
• Main Authors: Hu, Bo-Liang, Ge, Song-Wei, Han, Jia-Yu, Hua, Xing-Jiang, Li, Shi-Lei, Xing, Hai-Rui, Yuan, Long-Teng, Zhang, Xiang-Yang, Wang, Kuai-She, Hu, Ping, Volinsky, Alex A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.01.2022; Elsevier BV
• Subjects: Alloys; Ductility; Electrical resistivity; Elongation; Fracture toughness; High temperature; Materials science; Molybdenum; Molybdenum alloy; Molybdenum base alloys; Nanoparticles; Recrystallization; Structural; Thermal conductivity; Ultimate tensile strength; ZrTiO4 phase; Nanoparticles; ZrTiO4 phase; Molybdenum alloy; Ductility; Structural
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.131077

•A novel of high ductility Mo-2.5 wt% ZrTiO4 alloy was design.•Ductility reaches the maximum at 2.5 wt% ZrTiO4 and the room temperature elongation is 25.4%•Mo-ZT alloy strength increases with higher ZrTiO4 secondary phase content.•The main mechanism of ductility improvement is small-sized sub-crystals are not formed in the molybdenum matrix. Molybdenum materials are widely used in electronics and high-temperature applications because of their high strength and recrystallization temperature, good electrical and thermal conductivity. However,molybdenum brittleness, low ductility, and fracture toughness havebeenlimiting its applications. In this work, a newMo-ZT (Mo-ZrTiO4) alloy was designed containing various amounts of the ZrTiO4secondary phase, ranging from 0.5 wt% to 3 wt%. The Mo-ZT alloy with 2.5 wt% ZrTiO4 has the ultimate tensile strength above 1,000 MPa(rolled) and 25% elongation (annealed), which is higher than previously reported molybdenum alloys. Compared with the Mo-1ZT alloy, the elongation is increased by 166% with 2.5 wt% ZrTiO4 addition. This offers novel insightsfor improving alloys’ ductility.