Elevated temperature deformation behavior of an Al-8.4 wt pct Fe-3.6 wt pct Ce alloy

Yaney, D. L.; Nix, William D.

doi:10.1007/bf02646930

Cited by 40 publications

(14 citation statements)

References 15 publications

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“…[11] They attributed the threshold stresses to the presence of the fine Al 4 C 3 and Al 2 O 3 dispersiods as well as to the load shedding from the matrix to the Al 3 Ti intermetallics. Figure 2 in Reference 11 also infers that if the creep data were to cover a wider range of strain rates such that all three temperatures intersected a constant stress, the apparent activation energy would exceed the activation energy for self-diffusion in Al by a considerable amount consistent with the findings of Yaney and Nix [14] and with our present results as well. Our material and the material in Reference 11 contain considerably more second-phase particles, including the Al 3 Ti, which may themselves become deformable under high-temperature creep conditions.…”

Section: Discussionsupporting

confidence: 92%

“…[8] We concluded that grain growth or coarsening of the second-phase Al 3 Ti particles in this alloy could not fully account for the rapid drop in strength with temperature. The rapid drop in flow stress with temperature exhibited by the Al-Ti-Cu is identical to the drop in strength with temperature observed by Yaney and Nix [14] for an Al-8.4 wt pct Fe-3.6 wt pct Ce alloy. These authors concluded that coarsening of the microstructure could account for only a small fraction of the loss in strength with increasing temperature in the Al-Fe-Ce alloy and that factors other than coarsening were involved.…”

Section: Discussionsupporting

confidence: 69%

“…[14] Following Yaney and Nix, [14] we calculate the activation energy for creep of the Al-10Ti-2Cu from [1] where and correspond to the strain rates at 533 K (T1) and 588 K (T2) respectively. From Eq.…”

Section: Discussionmentioning

confidence: 99%

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Microstructure characterization and creep deformation of an Al-10 Wt Pct Ti-2 Wt Pct Cu nanocomposite

Hayes¹,

Berbon

Mishra

2004

Metall Mater Trans A

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The creep behavior of a cryomilled Al-10Ti-2Cu nanocomposite has been studied at temperatures of 533, 588, and 644 K at initial applied stresses ranging from 55 to 117 MPa. Although the strain rates fall within the 10 Ϫ10 to 10 Ϫ9 S Ϫ1 regime, we observe no evidence of threshold-type creep behavior in this material. We attribute this to the unique microstructure of the present material combined with the mechanism of dislocation slip in ultrafine grain size materials. In particular, the very fine AIN precipitates present within the microstructure are ineffective as obstacles to dislocations during hightemperature deformation. The coherent nature of these fine particles along with their extremely small size prevents a strong dislocation-particle attraction. The inability of the activation energy for self-diffusion in Al to successfully collapse the present creep data onto a single slope combined with the fact that the true activation energy for creep exceeds the value for lattice self-diffusion are both features found in materials containing second-phase particles, which deform simultaneously with the matrix during high-temperature deformation. In the present case, these particles are likely to be Al 3 Ti.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 69%

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Microstructure characterization and creep deformation of an Al-10 Wt Pct Ti-2 Wt Pct Cu nanocomposite

Hayes¹,

Berbon

Mishra

2004

Metall Mater Trans A

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“…(2) sind typisch fiir y'gehartete Legierungen [13,17]. Diese Parameter erweisen sich als unbeeinfluBt vom Mikrogefugezustand.…”

Section: Diskussionunclassified

Eigenschaften einkristalliner Turbinenschaufelwerkstoffe

Wege

Wortmann

1989

Materialwissenschaft Werkst

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Von herausragender Bedeutung für den Einsatz von Nickel‐Basis‐Legierungen in einkristallinem Zustand für die Anwendung als Turbinen‐Laufschaufel sind die dynamischen Festigkeiten und die Kriecheigenschaften. Es wird in Beispielen an den Werkstoffen CMSX6 und SRR99 aufgezeigt, daß die Schwingfestigkeit von Mikroporen kontrolliert wird. In diesem Zusammenhang wird auf legierungs‐ und herstelltechnische Einflüsse auf die Porenbildung eingegangen. Die Kriechfestigkeit und die bei mittleren Temperaturen beobachtete Anisotropie des Kriechverhaltens wird dagegen im wesentlichen durch die Morphologie der härteren γ' ‐ Phase und der durch sie gesteuerten Versagensmechanismen beeinflußt. Das stationäre Kriechverhalten läßt sich durch Potenzgesetze beschreiben.

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“…Dispersion-strengthened Al-Fe alloys have been produced by rapid solidification (RS) [18], or mechanical alloying (MA) [19]. Hot consolidation and extrusion are needed for the RS or MA powders in order to produce the alloy in bulk form.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of Al–Fe in situ nanocomposite produced by friction stir processing

2008

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Elevated temperature deformation behavior of an Al-8.4 wt pct Fe-3.6 wt pct Ce alloy

Cited by 40 publications

References 15 publications

Microstructure characterization and creep deformation of an Al-10 Wt Pct Ti-2 Wt Pct Cu nanocomposite

Microstructure characterization and creep deformation of an Al-10 Wt Pct Ti-2 Wt Pct Cu nanocomposite

Eigenschaften einkristalliner Turbinenschaufelwerkstoffe

Microstructure and mechanical properties of Al–Fe in situ nanocomposite produced by friction stir processing

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