2016年
ホイスラー合金Fe2VAlの変形特性に及ぼす結晶粒径の影響
日本金属学会誌
- ,
- ,
- 巻
- 80
- 号
- 5
- 開始ページ
- 317
- 終了ページ
- 320
- 記述言語
- 日本語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.2320/jinstmet.J2015063
- 出版者・発行元
- 日本金属学会
The deformation behavior of fine-grained Heusler-type Fe<sub>2</sub>VAl 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 Fe<sub>2</sub>VAl 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.
- リンク情報
- ID情報
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- DOI : 10.2320/jinstmet.J2015063
- ISSN : 0021-4876
- eISSN : 1880-6880
- Web of Science ID : WOS:000376436100003