Microstructure and tensile properties of Mo alloy synthetically strengthened by nano-Y2O3 and nano-CeO2

• Published in: Rare metals Vol. 33; no. 1; pp. 58 - 64
• Main Authors: Liu, Ren-Zhi, Wang, Kuai-She, Feng, Peng-Fa, An, Geng, Yang, Qin-Li, Zhao, Hu
• Format: Journal Article
• Language: English
• Published: Dordrecht Nonferrous Metals Society of China 01.02.2014
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; Nano-Y; Mo alloy wire; Nano-CeO; Tensile property; Fracture surface; Microstructure; O
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-013-0120-3

Nano-Y 2 O 3 and nano-CeO 2 of different weight ratio mixed with deionizing water were doped into MoO 2 powder by liquid–solid doping method. The diameter 1.80 and 0.18 mm alloy wires of Mo–0.3Y, Mo–0.3Ce, and Mo–0.15Y–0.15Ce were prepared through reduction, isostatic pressing, sintering, and drawing. Tensile properties, second phase microstructure and fracture surface appearance of wires were analyzed. The better refining effect for Mo alloy powder can be gotten after two kinds of nanoparticle oxide doped into MoO 2 than only one doped. Nano-Y 2 O 3 and nano-CeO 2 have different influences on sintering process. For nano-CeO 2 , the constraining effect of grain growth focuses on the initial sintering stage, nano-Y 2 O 3 plays refining grains roles in the later densification stage. Nano-Y 2 O 3 is undistorted and keeps intact in the process of drawing; and nano-CeO 2 is elongated and broken into parts in the drawing direction. The strengthening effect of nano-Y 2 O 3 and nano-CeO 2 keeps the finer grains and superior tensile properties for Mo–0.15Y–0.15Ce wire.