Enrichment Behavior of ω Clusters in Cold-Drawn Ti-45Nb Filaments
The enrichment behavior of ω clusters in cold-drawn Ti-45Nb (wt.%) filaments is observed and discussed in this paper. The ω phase precipitates as the colonies of almost the same orientation variants near the grain boundary with the size of single particle less than 3 nm in diameter. The enrichment of ω clusters leads to the formation of embrittlement regions in micron dimension along the grain boundary. After polishing and etching, the embrittlement regions transform into macroscopic necklace-like structure along the grain boundary. Furthermore, the volume fraction and mean width of embrittlement regions are measured accurately as a function of diameters. After recrystallization annealing, the enrichment regions disappear and ω particles equally distribute in the matrix.
Enhou Han, Guanghong Lu and Xiaolin Shu
B. Tang et al., "Enrichment Behavior of ω Clusters in Cold-Drawn Ti-45Nb Filaments", Materials Science Forum, Vol. 689, pp. 315-320, 2011