Sintering Behavior and Mechanical Properties of Injection Molded Ti-4.3Fe-7.1Cr Alloys

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  • Itoh Yoshinori
    Hamamatsu Industrial Research Institute of Shizuoka Prefecture
  • Uematsu Toshiaki
    Hamamatsu Industrial Research Institute of Shizuoka Prefecture
  • Sato Kenji
    Hamamatsu Industrial Research Institute of Shizuoka Prefecture
  • Miura Hideshi
    Department of Intelligent Machinery and Systems, Faculty of Engineering, Kyusyu University
  • Niinomi Mitsuo
    Department of Biomaterials Science, Institute for Materials Research, Tohoku University
  • Ikeda Masahiko
    Department of Materials Science and Engineering, Faculty of Engineering, Kansai University

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Other Title
  • Ｔｉ‐４．３Ｆｅ‐７．１Ｃｒ合金射出成形材の焼結挙動と機械的特性
  • Ti-4.3Fe-7.1Cr合金射出成形材の焼結挙動と機械的特性
  • Ti 4 3Fe 7 1Cr ゴウキン シャシュツ セイケイザイ ノ ショウケツ キョドウ ト キカイテキ トクセイ

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Abstract

The metal injection molding process was used to produce the Ti-4.3Fe-7.1Cr alloy compacts using the mixture of Ti and Fe-Cr alloy powders, and mixed elemental powder. The effect of mixed powder and sintering temperature on the densification behavior, mechanical properties and microstructures of the compacts were mainly investigated. The compacts sintered at below 1423K using a mixed elemental powder showed higher density and tensile strength as compared to the compacts using a mixture of Ti and Fe-Cr alloy powders. However, the tensile elongation at fracture of sintered compacts using both mixed powders was about 3%. Characteristic X-ray images and X-ray diffraction measurement confirms a particle dispersion, which is thought to be precipitation of α Ti phase, along the grain boundaries. Eventually, the tensile strength and relative density of the compacts sintered at 1423K using a mixed elemental powder attain 1160MPa and 96.9%, respectively.

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