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Microstructure of Directionally Solidified Ti-52Al-2W-0.5Si Intermetallic

机译:Ti-52Al-2W-0.5Si金属间定向凝固组织

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摘要

The phase transformations controlling the microstructure evolution during directional solidification (DS) using the Bridgeman process and subsequent cooling are described for a Ti-52Al-2W-0.5Si intermeticallic. The DS structure consists mainly of columnar dendrites with various shapes. α-Ti with a dendrite morphology is the primary solidified phase, followed by an incomplete paratactic reaction liquid (L)+α→γ-TiAl. The remaining liquid solidified as γ and silicates. During cooling after solidification s dendrites transform into ordered s and r with various morphologies. including near fully lamellar. script s in a r matrix and blocky α_2 in a γ matrix. Very fine tungsten-rich precipitates are also observed. The DS alloys is quite brittle. The microstructure evolution and the reason leading to the brittleness of the alloy are discussed.
机译:针对Ti-52Al-2W-0.5Si互模合金,介绍了使用Bridgeman工艺控制定向凝固(DS)期间微观组织演变以及随后冷却的相变。 DS结构主要由具有各种形状的柱状树枝状晶体组成。具有枝晶形态的α-Ti是主要的凝固相,随后是不完全的等规反应液(L)+α→γ-TiAl。剩余的液体固化为γ和硅酸盐。在凝固后的冷却过程中,s树枝状晶体转变为具有各种形态的有序s和r。包括近完全层状。 r矩阵中的脚本s和γ矩阵中的块状α_2。还观察到非常细的富钨沉淀。 DS合金非常脆。讨论了合金的显微组织演变和导致脆性的原因。

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