一方向凝固したNb-<I>x</I>Mo-22Ti-18Si系<I>In-Situ</I>複合材料の組織と機械的性質

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タイトル別名
  • Microstructures and Mechanical Properties of Directionally Solidified Nb-<I>x</I>Mo-22Ti-18Si <I>In-Situ</I> Composites
  • 一方向凝固したNb-xMo-22Ti-18Si系In-Situ複合材料の組織と機械的性質
  • 1ホウコウ ギョウコ シタ Nb xMo 22Ti 18Siケイ In Situ フクゴウ ザイリョウ ノ ソシキ ト キカイテキ セイシツ

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抄録

In order to examine the possibility of niobium solid solution/niobium silicides in-situ composites as future high temperature structural materials, directionally solidified Nb-xMo-22Ti-18Si(x=0, 10, 20 and 30) alloys were prepared by the floating zone melting technique. A part of each specimen was annealed at 1870 K in a vacuum for 100 h and examined by optical and scanning electron microscopy. Vickers hardness was measured at room temperature. The high temperature compression strength of annealed specimens was measured at 1470 and 1690 K in a vacuum at an initial strain rate of 1×10−4 s−1.<BR>By adding molybdenum, the microstructure became finer and the silicide changed from (Nb, Ti)3Si to (Nb, Mo, Ti)5Si3. The Vickers hardness of annealed specimens increased almost linearly with increasing molybdenum content, from 510 to 880. At 1470 K, a specimen with x=0 displayed high yield stress, but it fractured at a small plastic strain. As for specimens with x=10, 20 and 30, yield stress, maximum stress and compressive ductility increased with increasing molybdenum content. At 1690 K, specimens with x=0 and 10 had the higher maximum stress than the others, but they showed a sharp decrease in stress after reaching the maximum stress because of easy cracking. On the other hand, specimens with x=20 and 30 showed lower yield stress and maximum stress than those with x=0 and 10. They showed small stress drop after reaching the maximum stress, however, and almost constant flow stress of 330 MPa(x=20) and 400 MPa(x=30) for large strain range without any apparent cracking.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 64 (6), 474-480, 2000

    公益社団法人 日本金属学会

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