High Temperature Deformation of a Fine-Grained and Particle-Dispersed V-2.3%Y-4%Ti-3%Mo Alloy

DOI Web Site Web Site 21 References
  • Sakamoto Tatsuaki
    Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
  • Kurishita Hiroaki
    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
  • Kobayashi Sengo
    Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
  • Nakai Kiyomichi
    Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
  • Arakawa Hideo
    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University
  • Matsui Hideki
    International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University

Bibliographic Information

Other Title
  • High Temperature Deformation of a Fine Grained and Particle Dispersed V 2 3パーセント Y 4パーセント Ti 3パーセント Mo Alloy

Search this article

Abstract

The high temperature deformation behavior of a fine-grained and particle-dispersed V-2.3%Y-4%Ti-3%Mo (mass%) alloy was investigated. The alloy was fabricated by powder metallurgical methods utilizing mechanical alloying and hot isostatic pressing (HIP), followed by annealing at 1273 K for 3.6 ks. Tensile tests were performed at temperatures from 873 to 1273 K at initial strain rates from 2.5×10−5 to 1.0×10−1 s−1. X-ray diffraction analyses show that the HIPed and annealed specimens contain a significant amount of (Y, Ti)2O3 and small amounts of YN, Ti2O3 and TiO. Transmission electron microscopy observations show that the matrix contains approximately 3%Ti and 3%Mo in solution and that the average diameters of the matrix grains and dispersoids are about 620 and 42 nm, respectively. Tensile test results show that the yield stress depends strongly on test temperature and strain rate. From the dependence of the yield stress measured at 1073 and 1273 K on plastic strain rate, it is found that the dependence is divided into three regions with different deformation controlling mechanisms: a recovery controlling process of a long range internal stress field associated with dispersed particle (the high-strain-rate region), grain boundary sliding (the medium-strain-rate region) and presumably solute atmosphere dragging (the low-strain-rate region). Effects of 4%Ti addition on the microstructures and high temperature deformation behavior are discussed.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 47 (10), 2497-2503, 2006

    The Japan Institute of Metals and Materials

References(21)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top