Ductility in rapidly solidified NiAl

Gaydosh, D. J.; Jech, R. W.; Titran, R. H.

doi:10.1007/bf00728058

Cited by 27 publications

(9 citation statements)

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“…Although grain refinement was observed, the improvements in ductility and strength were attributed to the suppression of grain boundary segregation, and the low degree of ordered state with a high density of APB's, which was caused by suppression of ordering. Gaydosh, Jech, and Titran [8] also found that melt spun Ni-50A1 having a grain size of 5.4 um exhibited limited plastic deformation in a free bend test at room temperature. The fine grain size was thought to be at least partially responsible for the appearance of ductility.…”

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confidence: 89%

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Rapidly Solidified NiAl and FeAl

Gaydosh

Crimp

1984

MRS Proc.

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Melt spinning was used to produce rapidly solidified ribbons of the B2 intermetallics NiAl and FeAl. Both Fe-40Al and Fe-45A1 possessed some bend ductility in the as spun condition. The bend ductility of Fe-40Al, Fe-45Al, and equiatomic NiAl increased with subsequent heat treatment. Heat treatment at approximately 0.85 Tm resulted in significant grain growth in equiatomic FeAl and in all of the NiAl compositions. Low bend ductility in both FeAl and NiAl generally coincided with intergranular failure, while increased bend ductility was characterized by increasing amounts of transgranular cleavage fracture.

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confidence: 89%

“…One problem limiting the potential use of these materials is their low room temperature ductility. Application of rapid solidification processing to hese materials has already produced improvements in stren gth and ductility as compared to conventional processing [6,7,8].…”

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confidence: 99%

Rapidly Solidified NiAl and FeAl

Gaydosh

Crimp

1984

MRS Proc.

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“…9. Gaydosh et al 123 produced a fine grain size of 5·4 J.1m in NisoAlso by melt spinning. The ribbon exhibited limited plastic deformation in a room temperature bend test.…”

Section: Macroalloyed Ni 3 Ai (L 1 2 Structures)mentioning

confidence: 99%

Rapid solidification of intermetallic compounds

Koch¹

1988

International Materials Reviews

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This review surveys recent studies of rapid solidification at alloy compositions where the equilibrium phase is an intermetallic compound (or mixture of intermetallic compounds). Glass forming intermetallic compositions are considered and criteria for 'easy' glass formation are discussed. The limited data on synthesis of intermetallics from amorphous precursors are reviewed. This is a promising route to refine the microstructure of intermetallics with the potential for improved mechanical properties. It is an area that needs more study. The greatest effort has been devoted to studies of rapid solidification of the nickel-, iron-, or titanium-base aluminides. Rapid solidification of nickel base aluminides results in a refined microstructure (grain size and/or antiphase domain size) which can influence mechanical properties. The equilibrium crystal structure is maintained, however. Certain rapidly solidified Fe-AI-C base alloys can form a metastable fcc or L 1 2 structure (a point of continuing controversy) with good strength and ductility. The titanium base aluminides exhibit a marked tendency for formation of metastable structures on rapid quenching. The potential for improving the ductility of these compounds has made rapid solidification of Ti 3 AI and TiAI the subject of much recent activity.1MR/191

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“…The P/M-DR technique has been successfully applied to the Ni-Al-Mo system which is expected to have good high temperature performance as a result of the large y-y' lattice mismatch and the high y' content (70)(71)(72)(73)(74)(75)(76)(77)(78)(79)(80) vol. %) [16].…”

Section: Improved Performance Of "Conventional" Superalloys By Rapid mentioning

confidence: 99%

“…In a later study, free jet melt spinning was employed to produce a fine grained structure directly from the melt [71,72].…”

Section: Ni 3 Al-base LI 2 Alloysmentioning

confidence: 99%

Mechanical Properties of Rapidly Solidified Nickel-Base Superalloys and Intermetallics

Taub

Jackson

1985

MRS Proc.

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The improvements in the mechanical properties of nickel-base alloys that have been made possible by rapid solidification processing are reviewed.The results of processing by powder metallurgy, laser melting, low pressure plasma deposition and spray forming are examined.In general, the increased homogeneity obtained by rapid solidification allows for increased alloying and improved hot workability.The refined grain size improves the low and intermediate temperature strength, but leads to lower strengths at high temperature.For the high temperature applications, post solidification grain growth is required, as for example the directional recrystallization of powder metallurgy preforms.The development of a novel means of producing a fine dispersion from amorphous alloy precursors and the recent work attempting to improve the ductility of the intermetallic phases NiAl and Ni3A1 are also described.

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Ductility in rapidly solidified NiAl

Cited by 27 publications

References 3 publications

Rapidly Solidified NiAl and FeAl

Rapidly Solidified NiAl and FeAl

Rapid solidification of intermetallic compounds

Mechanical Properties of Rapidly Solidified Nickel-Base Superalloys and Intermetallics

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