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Microstructural and mechanical characterisation of Fe-14Cr-0.22Hf alloy fabricated by spark plasma sintering

DOI: 10.1016/j.jallcom.2018.05.196 DOI Help

Authors: M. A. Auger (University of Oxford) , Y. Huang (Hefei University of Technology) , H. Zhang (Loughborough University) , C. A. Jones (University of Oxford) , Z. Hong (University of Oxford) , M. P. Moody (University of Oxford) , S. G. Roberts (University of Oxford; Culham Centre for Fusion Energy) , P. S. Grant (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: May 2018
Diamond Proposal Number(s): 10597

Abstract: Fe-14Cr pre-alloyed powder and pure Hf powder were mechanically alloyed to produce powder with nominal composition Fe-14Cr-0.22Hf (wt. %) that was consolidated by the spark plasma sintering (SPS) technique in order to investigate the ability of Hf to produce a nanometric dispersion of oxide particles in a ferritic matrix. Comprehensive microstructural and mechanical characterisation of the as-milled powder and the consolidated material was performed using electron microscopy, X-ray diffraction, atom probe tomography and indentation techniques. It was shown that Hf additions can effectively produce, by internal oxidation, a fine scale dispersion of Hf-O nanoparticles in the consolidated material. A uniform grain structure was produced in the alloy. Although the nanoparticle dispersion was not homogeneous at the finest scale, the resulting dispersion strengthening contributed significantly to the hardness. According to these results, internal oxidation of reactive elements rather than direct addition of oxides may offer additional opportunities in the design and development of oxide dispersion strengthened steels.

Journal Keywords: Powder metallurgy; Hafnium; ODS steels; SPS; TEM; APT

Subject Areas: Materials

Instruments: I11-High Resolution Powder Diffraction