An in situ powder neutron diffraction study of nano-precipitate formation during processing of oxide-dispersion-strengthened ferritic steels

作者：Zhang Hongtao^*; Gorley Michael J; Chong Kok Boon; Fitzpatrick Michael E; Roberts Steve G; Grant Patrick S

来源：Journal of Alloys and Compounds, 2013, 582: 769-773.

DOI：10.1016/j.jallcom.2013.08.069

• Neutron diffraction
• Mechanical alloying
• Ferritic steels
• Oxide-dispersion-strengthened (ODS) alloy
• Precipitation

The evolution of phases in a Fe-14Cr-10Y(2)O(3) (wt%) oxide-dispersion-strengthened ferritic steel during mechanical alloying (MA) and subsequent annealing was studied by high resolution powder neutron diffraction, with emphasis on the kinetics of oxide-based nano-precipitate formation. Y2O3 particles were completely dissolved into the ferritic matrix during MA. The formation of nano-precipitates was then observed by in situ thermo-diffraction experiments during annealing of as-milled powder above 900 degrees C, supported by scanning electron microscopy. This revealed nano-precipitate coarsening with increasing annealing temperature. Powder microhardness was measured at various processing stages, and hardness changes are discussed in terms of the measured phase fractions, crystallite size and lattice strain at different temperatures and times.

• 出版日期2013-1-5