Improved fatigue resistance of Al-Zn-Mg-Cu (7075) alloys through thermomechanical processing

Ostermann, Friedrich

doi:10.1007/bf02813269

Cited by 67 publications

(14 citation statements)

References 10 publications

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“…It is also their number, distribution and coherency which decide the adverse effect of the inclusions [25]. Mechanical working of the refined alloy results in increased dislocation density thereby decreasing the rate of growth of fatigue cracks [26]. The overall effect is the enhanced fatigue resistance of the refined and extruded material.…”

Section: Fatigue Strengthmentioning

confidence: 99%

A Study of the Fatigue, Impact and Fracture Toughness Characteristics of Electroslag Refined IS: 7670 Alloy

Sampath¹,

Dwarakadasa²

1993

Canadian Metallurgical Quarterly

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The nuclear, aerospace, naval and missile industries place emphasis on materials with high structural integrity and reliable performance so as to meet certain stringent requirements in service. Strength is not the only criterion for selection. Properties such as fatigue resistance, impact toughness and fracture toughness. are equally important. Electroslag refining (ESR) has been used widely and successfully over the years for improving the fatigue resistance, creep resistance, impact strength and fracture toughness of steels and alloy steels. But application of ESR to aluminium alloys is only a recent endeavour. A highstrength aircraft aluminium alloy IS: 7670 was therefore chosen for studies on the fatigue strength and the impact and fracture toughness. The results indicate that the fatigue resistance is considerably improved after refining and that the impact strength and fracture toughness of the refined alloy are comparable with that of the unrefined alloy.Resume-Les industries nucleaire, aerospatiale et navale s'interessent gran dement aux materiaux presentant une tres grande intetrite structurale ainsi qu'une performance fiable, afin de satisfaire certaines exigences rigoureuses en service. La resistance mecanique n'est pas Ie seul critere de selection. Des propeietes comme la resistance a la fatigue, la resistance a l'impact ainsi que la tenacite sont egalement importantes. L'affinement par electroslag (ESR) est un procede qui a ete couramment utilise avec succes dans Ie passe pour ameliorer la resistance a la fatigue et au fluage ainsi que la resistance a l'impact et la tenacite d'aciers et d'aciers allies. Par contre, l'application du ESR aux alIiages d'aluminium est uneffort relativement recent. Le IS: 7670, un alliage d'aluminium a haute resistance pour applications aeronautiques, a donc ete choisi pour les etudes de fatigue et de tenacite. Les resultats montrent que la resistance a la fatigue est considerablement amelioree apres ESR et que la resistance a l'impact et la tenacite de l'alliage affine sont comparables a celles de l'alliage non affine.

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Section: Fatigue Strengthmentioning

confidence: 99%

A Study of the Fatigue, Impact and Fracture Toughness Characteristics of Electroslag Refined IS: 7670 Alloy

Sampath¹,

Dwarakadasa²

1993

Canadian Metallurgical Quarterly

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“…Von besonderer Wichtigkeit ist auch die Arbeit von Ostermann (19), weil sie zeigt, daB durch thermomechanische Behandlungen die die Eigenschaften verschlechternden Bander verhindert oder doch in ihrem Volumenanteil verringert werden konnen. Allerdings bezieht sich (19) auf AlZnMg-Legierungen und nicht auf AlCu-Basislegierungen.…”

Section: Ermiiden Nach Dem Auslagernunclassified

Hochtemperatur‐Ermüdung der aushärtbaren Legierung AlCuMnZr (2219) – eine Gefügeanalyse

Kraft

Heimendahl

Singer

1980

Materialwissenschaft Werkst

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Die warmfeste Legierung AlCuMnZr (voll ausgehärtet) wird gleichzeitig einer Dauerschwingbelastung sowie einer Temperaturerhöhung (300 °C) unterworfen. Diese Beanspruchungskombination (Hochtemperatur‐Ermüdung) tritt in der Praxis vielfach auf, u.a. in Zylinder‐köpfen. Der Werkstoff wird anschließend mechanisch (Härtemessungen) sowie licht‐ und elektronenmikroskopisch untersucht. Die Mikroskopie erhellt die ausgeprägte Inhomogenität des Verformungsgefüges, das aus schmalen bänderförmigen Bereichen besteht, in denen die Phasentransformation Θ′ → Θ stattgefunden hat. Diese Bänder umschließen das Θ′‐gehärtete Grundgefüge. In letzterem hat die Ermüdung das Teilchenwachstum im Vergleich zu einer Auslagerung ohne Belastung etwas beschleunigt. Die Ergebnisse werden im Lichte der vorhandenen Literatur und Theorien diskutiert.

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“…The intrinsic ability to predict and control microstructures was established as the most viable and attractive technique to achieve notable improvements in toughness, stress corrosion resistance, cyclic fatigue resistance, and fracture properties processing treatments (Ref [8][9][10][11][12][13][14], which result in the emergence of derivative alloys and tempers.…”

Section: Introductionmentioning

confidence: 99%

The tensile response and fracture behavior of an Al-Zn-Mg-Cu alloy: Influence of temperature

Srivatsan

Anand

Veeraghavan

et al. 1997

J. of Materi Eng and Perform

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A high-performance, high-strength, and novel AI-Zn-Mg-Cu alloy in the T7751 condition was deformed to failure in laboratory air environment at ambient and elevated temperatures. Temperature influenced the tensile response of the alloy for both the longitudinal and transverse orientations. Strength decreased with an increase in test temperature, with a concomitant improvement in ductility. Test results indicate the alloy response to be the same for both the longitudinal and transverse orientations. No major change in the macroscopic fracture mode was observed with the direction of testing. Tensile fracture, on a microscopic scale, revealed features reminiscent of both ductile and brittle mechanisms. The microscopic fracture behavior was a function of test temperature. The mechanisms and intrinsic micromechanisms governing the tensile fracture process are discussed in terms of mutually interactive influences of microstructural effects, matrix deformation characteristics, test temperature, and grain boundary failure.

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Improved fatigue resistance of Al-Zn-Mg-Cu (7075) alloys through thermomechanical processing

Cited by 67 publications

References 10 publications

A Study of the Fatigue, Impact and Fracture Toughness Characteristics of Electroslag Refined IS: 7670 Alloy

A Study of the Fatigue, Impact and Fracture Toughness Characteristics of Electroslag Refined IS: 7670 Alloy

Hochtemperatur‐Ermüdung der aushärtbaren Legierung AlCuMnZr (2219) – eine Gefügeanalyse

The tensile response and fracture behavior of an Al-Zn-Mg-Cu alloy: Influence of temperature

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