The Effect of Titanium Addition on Microstructure and Properties of Laves Phase Cr₂Nb Alloy Synthesized by Hot Pressing

Abstract:

The composite materials with a nominal composition of Cr₂Nb-24wt.%Ti were fabricated by mechanical alloying followed by hot pressing. The microstructures and properties were investigated on the composites contained with Laves phase prepared through 20 hours mechanical alloying of chromium, niobium and titanium elemental powders and hot pressing at 1250°C for half an hour. The results indicate that the near full-dense Laves phase Cr₂(Nb,Ti) based alloy with homogeneous composition and microstructure is obtained by mechanical alloying and hot pressing techniques. The dispersed soft second phase Nb solid solutions with the fine grain size less than 1μm are distributed uniformly on the matrix. The sample has a relative density of 99%, fracture toughness of 5.32MPa•m^1/2 and compress strength of 2080MPa. Due to the effect of fine-grain and alloying addition, the toughening of the Cr₂(Nb,Ti) based alloy has been fully realized.

• Periodical: Advanced Materials Research (Volumes 328-330)
• Pages: 1102-1108
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.328-330.1102
• Online since: September 2011
• Authors: Xuan Xiao, Shi Qiang Lu, Xian Juan Dong, Ming Gang Huang, Jun Wei Liu
• Keywords: Alloying Toughening, Hot-Pressing, Laves Phase Cr₂Nb, Mechanical Alloying (MA), Microstructure, Property Analysis

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