Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9795785 | Materials Science and Engineering: A | 2005 | 7 Pages |
Abstract
The effect of carbon and heat treatment on microstructural stability of a near-α titanium alloy Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd during high-temperature exposure was investigated. Aging leads to the precipitation of α2 phase from α after both β- and (α + β)-solution treatment. The α2 precipitates are uniformly distributed throughout the α matrix for alloys aged at 700 °C and 750 °C, but the precipitation is heterogeneous, preferring dislocations or other substructures during aging at 800 °C. Carbon has little effect on α2 precipitation for fully lamellar microstructure because there is no partitioning of alloying elements. For bimodal microstructure with â¼15% primary α (αp), however, increasing carbon addition reduces α2 particle size and increases interparticle spacing in αp after exposure at 700-800 °C for 168 h, reducing and delaying α2-related embrittlement. This effect is attributed to carbon decreasing the Al concentration of the αp and increasing the partitioning of Al and Mo to the transformed β.
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Authors
S.Z. Zhang, H.Z. Xu, G.P. Li, Y.Y. Liu, R. Yang,