Recrystallization Behavior of CoCrCuFeNi High-Entropy Alloy

Nokeun Park, Ikuto Watanabe, Daisuke Terada, Yoshihiko Yokoyama, Peter K. Liaw, Nobuhiro Tsuji

研究成果: Article査読

69 被引用数 (Scopus)

抄録

We investigated the recrystallization behavior of a cold-rolled CoCrCuFeNi high-entropy alloy (HEA). Two different face-centered cubic phases having different chemical compositions and lattice constants in the as-cast specimen have different chemical compositions: One phase was the Cu-lean matrix and the other was the Cu-rich second phase. The second phase remained even after a heat treatment at 1373 K (1100 °C) and Cu enriched more in the Cu-rich second phase. The calculated mixing enthalpies of both Cu-lean and Cu-rich phases in the as-cast and heat-treated specimens explained that Cu partitioning during the heat treatment decreased the mixing enthalpy in both phases. In the specimens 90 pct cold rolled and annealed at 923 K, 973 K, and 1073 K (650 °C, 700 °C, and 800 °C), recrystallization proceeded with increasing the annealing temperature, and ultrafine recrystallized grains with grain sizes around 1 μm could be obtained. The microhardness tended to decrease with increasing the fraction recrystallized, but it was found that the microhardness values of partially recrystallized specimens were much higher than those expected by a simple rule of mixture between the initial and cold-rolled specimens. The reason for the higher hardness was discussed based on the ultrafine grain size, sluggish diffusion expected in HEAs, and two-phase structure in the CoCrCuFeNi alloy.

本文言語English
ページ(範囲)1481-1487
ページ数7
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
46
4
DOI
出版ステータスPublished - 2015 4

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

フィンガープリント

「Recrystallization Behavior of CoCrCuFeNi High-Entropy Alloy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル