Effects of Vanadium Addition on the Material Properties of L1<SUB>2</SUB> -Type Ordered Alloys in the Al-Ti-Cr System

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  • Mabuchi Hiroshi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Tsuda Hiroshi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Matsui Toshiyuki
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Morii Kenji
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

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Other Title
  • Al-Ti-Cr系L1<SUB>2</SUB>型規則構造合金の材料特性に及ぼすV添加の影響
  • Al-Ti-Cr系L12型規則構造合金の材料特性に及ぼすV添加の影響
  • Al Ti Crケイ L12ガタ キソク コウゾウ ゴウキン ノ ザイリョウ トクセイ ニ オヨボス V テンカ ノ エイキョウ

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Abstract

To investigate the effects of vanadium addition on the formation and material properties of the L12-type intermetallic compounds in the Al-Ti-Cr system, button ingots of Al-25Ti-5Cr-4V and Al-xTi-yCr-3V(x=25, 27, 29, y=6, 8, 10, 12, 14) alloys were prepared by arc-melting. The L12-type phase is formed in the (Al, Cr)3Ti-base alloys containing vanadium content up to 4 mol%. The vanadium atom, as well as chromium atom, substantially occupies the Al-site of the L12 structure. The Vickers hardness increases slightly by the addition of vanadium, and is nearly independent on the Cr+V contents, although the higher titanium alloys have larger hardeness. The bend ductility at ambient temperature is not improved by the addition of vanadium. The best ductility is about 0.5% (plastic bend strain) for the Al-25Ti-12Cr-3V alloy. Serrations in the compressive stress-strain curve are observed at 673 and 873 K. The high temperature yielding phenomenon is also observed at 1473 K. This softening behavior is thought to be caused by dynamic recrystallization. The compressive yield strength (0.2% offset) gradually decreases from around 300 MPa at ambient temperature to about 190 MPa at 1300 K, and then decreases rapidly. From tests performed at strain rate varying from 1×10−4 to 2×10−2 s−1, the data reveal that the compressive strength is independent of strain rate at 1173 and 1273 K; although at 1373 and 1473 K strain rate dependency is observed. Thus the L12-type Al-25Ti-5Cr-4V alloy retains a high temperature strength level of about 200 MPa at 1173 K. The L12-type alloys in the Al-Ti-(Cr+V) system have a smaller linear expansion coefficient and an excellent oxidation resistance as well as the L12 Al-Ti-Cr alloys without vanadium.

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