The Influence of Ni on the Microstructure of Co-Base ODS Alloys
Co-based ODS alloys strengthened by γ΄ precipitates and nanosized oxides are promising high-temperature structural materials. Single solid solution of Al and W in the matrix can not be achieved after mechanical alloying, resulting in the formation of low volume fraction of γ΄ phase and several kinds of secondary phases. The addition of Ni promotes the precipitation of γ΄ phase and reduces the amount of secondary phases by the enlargement of the solid solution limit of Al and W within the matrix. In comparison with the lower fracture strength and cleavage fracture mode of the alloy without the addition of Ni, Ni-containing Co-base ODS alloys exhibit much higher fracture strength and obvious ductile facture mode.
Chunxiang Cui, Yali Li and Zhihao Yuan
L. Zhang et al., "The Influence of Ni on the Microstructure of Co-Base ODS Alloys", Advanced Materials Research, Vols. 535-537, pp. 1011-1014, 2012