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Preparation of Ti-Mo-Si Alloy Powders from Ti alloy scraps

  • : Ki-Min Roh1, Wonbaek Kim1, Chang-Youl Suh1, Hanjung Kwon1
  • : 1Korea Institute of Geoscience and Mineral Resources
  • : PDF Download
  • : 2014


Ti and Ti based alloys have drawn much attention in military and aerospace industries because of their mechanical strength and corrosion resistance. Among various types of Ti based alloys, Ti alloys with β-phase structure are known to have better hardness, heat treatability, and plastic machinability than Ti metal. Since Mo, a powerful β-phase stabilizer, greatly improves the strength and room-temperature ductility of Ti alloys, Ti-Mo alloys are widely used as a structural material for aircrafts and gas turbine engines that require the durability and strength at high temperature for a short time. In this report, Low-oxygen content Ti-Mo-Si powders were manufactured using two types of ternary Ti alloy ingots which were prepared by vacuum arc melting of Ti-Mo scrap with Si. The weight ratio of Ti-Mo scrap was Ti:Mo = 9:1 and Si contents in two alloy ingots were 1 and 2%. The alloy powders were prepared by the hydrogenation-dehydrogenation and the subsequent solid-state deoxidation method. The deoxidation process effectively reduced the initial oxygen content from 3,350 ppm to 1,700 ppm. In addition, the high-temperature oxidation resistance was enhanced by adding Si to Ti-Mo alloys. Thermal gravimetric analysis showed that the weight gain by oxidation was reduced from 8.85% for Ti-Mo to 7.5% for Ti-Mo-Si at 1,500 °C.

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