Effect of heterogeneous precipitation caused by segregation of substitutional and interstitial elements on mechanical properties of a β-type Ti alloy

Narita, Kouji; Niinomi, Mitsuo; Nakai, Masaaki; Suyalatu,

doi:10.1016/j.msea.2015.07.002

Cited by 12 publications

(2 citation statements)

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“…This causes the formation of PFZs along the grain boundaries. Similarly, Narita et al [7] suggested that the segregation of interstitial elements creates precipitate-free zones. It is notable that the PFZs mentioned above are all along the grain boundaries and arise from the microsegregation of alloying elements.…”

Section: Introductionmentioning

confidence: 96%

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Formation of Large Size Precipitate-Free Zones in β Annealing of the Near-β Ti-55531 Titanium Alloy

Jiang

Shi

Fan

et al. 2019

Metals

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Large size (>10000 μm2) precipitate-free zones in the absence of microsegregation were observed in the near-β Ti-55531 titanium alloy after furnace cooling from high temperature and longtime annealing in the single-β phase field. To reveal the formation mechanism of the large size precipitate-free zone, continuous cooling and isothermal heat treatment were carried out to investigate the β-α phase transformation process. It was found that the large size precipitate free zone is attributed to the heterogeneous nucleation of α phase. The nucleation site evolves in three different modes: I-random nucleation inside the β grain, II-network nucleation inside the β grain and, III-heterogeneous nucleation on the precipitated α phase. Modes I and II lead to homogeneous transformed structure while Mode III results in the large size precipitate-free zone. Both modes II and III are promoted at high annealing temperature, rapid cooling above 600 °C or slow cooling below 600 °C. Mode II is common as it can minimize the strain energy in phase transformation. As a result, the formation of the large size precipitate-free zone is not deterministic.

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Section: Introductionmentioning

confidence: 96%

“…The PFZs near grain boundaries result in intergranular fracture and waken the ductility [6]. Narita [7] found that the existence of PFZs in β type titanium alloy decreases ductility and tensile strength. Decreases in width of the PFZ improved the tensile properties, and the presence of the PFZ was found to be harmful to the fracture [8].…”

Section: Introductionmentioning

confidence: 99%