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High strength and ductility of electron beam melted β stabilized γ-TiAl alloy at 800°C

机译:电子束的高强度和延展性在800°C下熔化β稳定的γ-Tial合金

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摘要

A nearly fully dense beta stabilized gamma-TiAl alloy was additively manufactured by electron beam melting. The as-fabricated specimen exhibited a fine structure consisting of alpha(2)/gamma colonies ( 5 mu m), equiaxed gamma (1 mu m) and beta(o) ( 1 mu m) grains. The unique microstructure rendered high strength (580 MPa) and high ductility ( 50%) in the sample at 800 degrees C. Annealing and subsequent stabilization treatments resulted in alpha(2)/gamma colonies ( 50 mu m) with an ultrafine (20-40 rim) lamellar structure, which gave rise to high strength (770 MPa) and good ductility (6%) levels superior to those of conventional counterparts and other gamma-TiAl alloys at 800 degrees C.
机译:通过电子束熔化加质地制造了几乎完全致密的β稳定的γ合金。制造的标本表现出由α(2)/γ菌落(<5μm),等轴γ(1μm)和β(1μm)颗粒组成的细结构。独特的微观结构在800℃下呈现在样品中的高强度(580MPa)和高延性(> 50%)。退火和随后的稳定化处理导致α(2)/γ菌落(<50μm)用超细( 20-40轮辋)层状结构,其产生高强度(770MPa)和优于传统对应物和其他800℃的其他γ-Tial合金的延展性(6%)水平。

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