Oxide Particle Refinement in 4.5 mass%Al Ni-Based ODS Superalloys

Qingxin Tang; Shigeharu Ukai; Naoko Oono; Shigenari Hayashi; Bin Leng; Yoshito Sugino; Wentuo Han; Takanari Okuda

doi:10.2320/matertrans.M2011251

Qingxin Tang, Shigeharu Ukai, Naoko Oono, Shigenari Hayashi, Bin Leng, Yoshito Sugino, Wentuo Han, Takanari Okuda

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Keywords: nickel-based superalloy, oxide dispersion strengthening (ODS), mechanical alloying, oxide particle, size and distribution

JOURNAL FREE ACCESS

2012 Volume 53 Issue 4 Pages 645-651

DOI https://doi.org/10.2320/matertrans.M2011251

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Abstract

Oxide particle refinement, which improves high temperature strength in Ni-based oxide dispersion strengthened (ODS) superalloys, was investigated by employing Hf addition during mechanical alloyed (MA) process. TEM micrographs show that 2 mass% Hf addition makes the smallest oxide particles and shortest separation in the base alloy (Ni–4.5 mass%Al–1 mass% Y₂O₃). Formation of Y₂Hf₂O₇ is confirmed to be responsible for the oxide particle refinement with XRD analysis. By the calculation and comparison based on hardness and Orowan mechanism, the improvement of hardness by Hf addition attributes to the dispersion strengthening of oxide particles.

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