Materials Transactions Online

Materials Transactions, Vol.53 No.04 (2012) pp.645-651
© 2012 The Japan Institute of Metals

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

Qingxin Tang1, Shigeharu Ukai1, Naoko Oono1, Shigenari Hayashi1, Bin Leng1, Yoshito Sugino1, Wentuo Han1 and Takanari Okuda2

1Material Science and Engineering, Faculty of Engineering, Hokkiado University, Sapporo 060-8626, Japan
2Kobelco Research Institute Ltd., Kobe 651-2271, Japan

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.

(Received 2011/08/18; Accepted 2012/01/23; Published 2012/03/25)

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

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