Plasma and Fusion Research

Volume 16, 2405053 (2021)

Regular Articles

Influence of Cu-Y Compound Content on the Microstructure of Cu-Y₂O₃ Dispersion Strengthened Alloys Synthesized by MA and HIP Process

Bing MA¹⁾, Yoshimitsu HISHINUMA^1,2), Hiroyuki NOTO^1,2) and Takeo MUROGA^1,2)

1): The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
2): National Institute for Fusion Science, Toki 509-5292, Japan

(Received 16 November 2020 / Accepted 11 February 2021 / Published 7 June 2021)

Abstract

Oxide Dispersion Strengthened Cu alloy (ODS-Cu) with Y₂O₃ has great application potential in the field of fusion. In the previous fabrication method by adding metal Y as the source of Y₂O₃, severe sticking occurred during mechanical alloying (MA) and huge Y particles still remained after MA. Considering that Cu-Y compounds are more brittle than pure Y, which is expected to resolve the sticking issue, and have lower Y enrichment, which will make it easier to form uniform Y distribution, ODS-Cu with various content of Y by adding Cu₂Y or Cu₆Y were fabricated through MA and Hot isostatic pressing (HIP) process. A comparative analysis was made for the samples with addition of Cu₂Y and Cu₆Y. The results showed that, compared with Cu₂Y, Cu₆Y is easier to form uniform Y distribution. The most likely reason is that the Cu₆Y is more brittle and less Y abundance than Cu₂Y. The sample with 0.39 wt% Y with Cu₆Y addition has the highest Vickers hardness, possibly because of solution strengthening caused by higher content of interstitial O, and better electrical conductivity than the sample with 1.19 wt% Y with Cu₆Y possibly because of the more uniform formation of Y₂O₃ and the absence of precipitation phases.

Keywords

Cu alloy, ODS, Y₂O₃, Cu₂Y, Cu₆Y, mechanical alloying

DOI: 10.1585/pfr.16.2405053

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