Structure and composition of oxides in FeCrAl ODS alloy with Zr addition

ABSTRACT

FeCrAl ODS (oxide dispersion strengthened) alloy with Zr addition was investigated with the main focus on the structure and composition of oxide particles. The results reveal that almost all the small particles (diameter <2 nm) were found to be consistent with trigonal δ-phase Y₄Zr₃O₁₂, with cubic Y₃Al₅O₁₂ (YAG) oxides occasionally detected. The large particles (>2 nm) were mainly identified as monoclinic Al₂O₃ oxides. A core/shell structure is found in slightly large oxide particles. Oxide cores are Al and O while shell regions are enriched in Y. This leads us a promising way to control the structure and size of the oxides and develop the high-performance FeCrAl ODS alloys.

KEYWORDS:

• Mechanical alloying
• nanoscale oxide
• core/shell structure
• FeCrAl ODS alloy
• Y₄Zr₃O₁₂ particles

Disclosure statement

No potential conflict of interest was reported by the author.

ORCID

Haijian Xu http://orcid.org/0000-0002-3139-6322

Zhiwei Zhang http://orcid.org/0000-0002-4933-4859

Additional information

Funding

This research is supported by the National Natural Science Foundation of China (51471049), Fundamental Research Funds for the Central Universities (N141006001) and Specialized Research Fund for the Doctoral Program of Higher Education (20130042110014). The FIB and TEM analyses were carried out at the Joint-use Facilities: Laboratory of Nano-Micro Material Analysis, Hokkaido University. H. X. is grateful for the financial support provided by the China Scholarship Council (CSC) during the visit to the Hokkaido University.