Effects of Grain Size on Deformation Behavior of Heusler-type Fe<sub>2</sub>VAl Alloys

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  • Fukada Yusuke
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Ide Naoki
    Department of Materials Science and Engineering, Nagoya Institute of Technology
  • Nishino Yoichi
    Department of Frontier Materials, Nagoya Institute of Technology

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Other Title
  • ホイスラー合金 Fe<sub>2</sub>VAl の変形特性に及ぼす結晶粒径の影響
  • ホイスラー合金Fe₂VAlの変形特性に及ぼす結晶粒径の影響
  • ホイスラー ゴウキン Fe ₂ VAl ノ ヘンケイ トクセイ ニ オヨボス ケッショウ リュウケイ ノ エイキョウ

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Abstract

 The deformation behavior of fine-grained Heusler-type Fe2VAl alloys (average grain diameter d=14, 2.0, 1.4 and 0.4 μm) made by pulse current sintering (PCS) has been investigated in comparison with the arc-melted alloys with d=130 μm. The yield stress of the Fe2VAl alloys at 300 K increases as the grain size decreases, following the Hall-Petch relationship except for d=0.4 μm. An anomalous increase in the yield stress with increasing temperature can be observed for d=14 and 130 μm, whereas the yield stress peak disappears for d≤2.0 μm. The yield stress decreases at a lower temperature for finer grains, which occurs in parallel with a steep rise in the strain rate sensitivity exponent m. The m value for d=2.0 μm reaches the maximum of 0.32 at 1123 K, and the temperature is almost 200 K lower than that for d=130 μm. The decrease in the yield stress can be explained by a lower temperature superplasticity for finer grained alloys.<br>

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