Microscopy and tensile behavior of melt-spun Ni-Al-Fe alloys

Huang, Shenyan; Field, R. D.; Krueger, D. D.

doi:10.1007/bf02656580

Cited by 44 publications

(13 citation statements)

References 24 publications

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“…[25] Zig-zag a͗100͘ dislocations have also been reported for the ␤ phase in Ni-Fe-Al alloys. [26,27] ͗111͘ directions were the preferred line directions of the a͗100͘ dislocations on {011} slip planes in the ␤ phase, consistent with experimental [28] and simulation [29] results on ␤-NiAl.…”

Section: Dislocation Substructuressupporting

confidence: 85%

“…[13,27,30,31] Inoue et al [30] had attributed the ductility of rapidly solidified ␤ ϩ (␥ ϩ ␥') Ni-Fe-Al alloys to a combination of fine grain size, suppression of order, and grain boundary segregation. Huang et al [27] studied the annealed melt-spun ribbons and concluded that the ductility was due to two factors: deformation transfer from ␥ to ␤ and activation of ͗111͘ slip in the ␤ phase. Chen et al [31] studied DS Ni-Fe-Al alloys and interpreted the observed ductility in terms of slip transfer and crack blunting by the ductile ␥ phase.…”

Section: A Tensile Ductilitymentioning

confidence: 99%

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Room-temperature deformation behavior of directionally solidified multiphase Ni-Fe-Al alloys

Misra

Gíbala

1997

Metall Mater Trans A

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Directionally solidified (DS) ␤ ϩ (␥ ϩ ␥') Ni-Fe-Al alloys have been used to investigate the effect of a ductile second phase on the room-temperature mechanical behavior of a brittle ͗001͘-oriented ␤ (B2) phase. The ductile phase in the composite consisted of a fine distribution of ordered ␥ ' precipitates in a ␥ (fcc) matrix. Three microstructures were studied: 100 pct lamellar/rod, lamellar ϩ proeutectic ␤, and discontinuous ␥. The ␤ matrix in the latter two microstructures contained finescale bcc precipitates formed due to spinodal decomposition. Room-temperature tensile ductilities as high as 12 pct and fracture toughness (K Q ) of 30.4 MPa were observed in the 100 pct lamellar/rod ͌m microstructure. Observations of slip traces and dislocation substructures indicated that a substantial portion of the ductility was a result of slip transfer from the ductile phase to the brittle matrix. This slip transfer was facilitated by the Kurdjumov-Sachs (KS) orientation relationship between the two phases and the strong interphase interface which showed no decohesion during deformation. In microstructures which show higher values of tensile ductility and fracture toughness, ͗100͘ slip was seen in the ␤ phase, whereas ͗111͘ slip was seen in the ␤ phase in the microstructure which showed limited ductility. The high ductility and toughness are explained in terms of increased mobile dislocation density afforded by interface constraint. The effect of extrinsic toughening mechanisms on enhancing the ductility or toughness is secondary to that of slip transfer.

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Section: Dislocation Substructuressupporting

confidence: 85%

Section: A Tensile Ductilitymentioning

confidence: 99%

Room-temperature deformation behavior of directionally solidified multiphase Ni-Fe-Al alloys

Misra

Gíbala

1997

Metall Mater Trans A

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“…Macroalloying by the addition of a third element, Fe, can modify the microstructures of NiAl from that of a ␤Ј single-phase state to a mixture of three phases, ␥ (fcc), ␥Ј (ordered fcc, L1 2 structure), and ␤Ј (ordered bcc, B2 structure), and improve the ductility at room temperature. [1][2][3][4][5][6] This improvement demonstrates that the thin ductile ␥-phase layer which surrounds the relatively brittle ␤Ј phase inhibits the nucleation of cracks and facilitates plastic deformation.…”

Section: Introductionmentioning

confidence: 96%

“…[8] This work investigated the microstructural evolution and elevatedtemperature tensile properties of ternary Ni 47. 5 Al 25 Fe 27. 5 alloys, and the effect of Cr or Nb on quaternary Ni 47.03 Al 24.75 -Fe 27.23 X 1 alloys.…”

Section: Introductionmentioning

confidence: 98%

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Mechanical behaviors of chromium- or niobium-modified Ni47.5Al25Fe27.5 alloy at elevated temperature

Tsau

Yeh

Jang

2006

Metall Mater Trans A

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The microstructure of the Ni 47.5 Al 25 Fe 27.5 alloy was modified by adding Cr or Nb to improve its tensile properties. Increasing the Cr content increased the volume fraction of the interdendritic regions and, subsequently, increased the tensile elongation at room temperature. Additionally, adding Nb significantly improved the tensile properties of the Ni 47.03 Al 24.75 Fe 27.23 Nb 1 alloy, because the element Nb reduces the number of ␥/␤Ј interfaces and strengthened both the ␥ and ␤Ј phases and the ␥/␤Ј interfaces. Both the as-annealed Ni 47.03 Al 24.75 Fe 27.23 Cr 1 and Ni 47.03 Al 24.75 Fe 27.23 Nb 1 alloys exhibited a tensile elongation at room temperature of over 10 pct. However, temperature strongly affected the tensile properties. The brittleness of the Ni 47.03 Al 24.75 Fe 27.23 Nb 1 alloy was effectively inhibited because of its lower temperature sensitivity at moderate temperatures.

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Elevated temperature deformation behaviour of multi-phase Ni-20 at % Al-30 at % Fe and its constituent phases

Guha

Baker

Munroe

1996

JOURNAL OF MATERIALS SCIENCE

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Microscopy and tensile behavior of melt-spun Ni-Al-Fe alloys

Cited by 44 publications

References 24 publications

Room-temperature deformation behavior of directionally solidified multiphase Ni-Fe-Al alloys

Room-temperature deformation behavior of directionally solidified multiphase Ni-Fe-Al alloys

Mechanical behaviors of chromium- or niobium-modified Ni47.5Al25Fe27.5 alloy at elevated temperature

Elevated temperature deformation behaviour of multi-phase Ni-20 at % Al-30 at % Fe and its constituent phases

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