Abstract
V-4Cr-4Ti alloys currently constitute advanced candidate materials for the blanket of future fusion reactors. Precipitations occur in the working environment of V-4Cr-4Ti alloy and affect the stability of the alloy. The working environment was simulated by aging at 773–973 K and the formation of precipitation and its effect on mechanical properties was studied. The result showed that Ti-rich precipitates formed in the alloy when aged. The precipitates were lath-like and lower in size and density when aged at 773 K. And lath-like precipitates with larger size and density formed at 873 K. While polygon precipitates formed at 973 K with a size and density lower than 773 K and 873 K. The composition analysis indicates that the three precipitates formed during aging consist of Ti(CN). The crystal structures of the precipitates are face-centered cubic (FCC). The interface between the matrix and the precipitate can be semi-coherent. Both lath-like and polygon precipitates increase the hardness and strength of the alloy. Among these, the comprehensive mechanical properties due to higher strength and elongation obtained in alloys with polygon precipitates. The formation mechanism of precipitation was analyzed from the atomic point of view.
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