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- W2013609890 abstract "Replacement of approximately 9 at% of the Al in the DO22 crystal structure compound Al3Ti with Cr, Fe and/or Mn leads to the formation of a potentially more ductile L12 phase. Utilizing room temperature hardness as a measure of ductility, a series of quaternary alloys containing a total of 9 at% of Cr, Fe and/or Mn in Al-25Ti was produced. Based on the presence of a single phase and minimums in hardness-composition profiles, a quinary and four quaternary compositions were selected for further study, cast as 2 kg heats and forged into pancakes. Small diameter compression test samples were taken from each forging and tested under constant velocity and constant load conditions in air between 900 and 1200 K. The results from this testing indicated that the quinary alloy, Al66Ti25Mn4.5Cr3Fe1.5, had the best strength; however results from other work (K. S. Kumar and S. A. Brown, Scripta Metall. et Mater., 26 (1992) 197–202) indicates that grain size might be more important than composition in determining elevated temperature deformation resistance. Comparison of the existing creep results for L12-modified Al3Ti indicates that larger grain sizes are necessary for strength and that the stress-independent activation energies for deformation are close to that measured for volume diffusion even when grain boundary deformation mechanisms are active. Contrasting the 1100 K creep behavior of the quinary composition to other TiAl intermetallics reveals that the current L12 forms of Al3Ti do not possess a strength advantage over single phase α2 or γ alloys or a lamellar α2 + γ mixture." @default.
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- W2013609890 title "Characteristics of elevated temperature deformation in several L12- modified Al3Ti-based alloys" @default.
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- W2013609890 doi "https://doi.org/10.1016/0966-9795(95)98933-y" @default.
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