Creep behavior of ingot and powder metallurgy 6061Al

Fernández, Rafael Ramos; González-Doncel, Gaspar

doi:10.1016/j.jallcom.2006.09.041

Cited by 22 publications

(50 citation statements)

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“…The materials investigated, the PM processing route, and the experimental procedure for the creep tests are well described elsewhere [1,7]. Briefly, powder of 6061Al alloy of average particle size less than 45 mm [7] was mixed in a ball-mill with SiC whiskers 20-40 m in length and average diameter of 0.4 m [8].…”

Section: Complete Revised Work Click Here To View Linked Referencesmentioning

confidence: 99%

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Creep fracture and load transfer in metal–matrix composite

Fernández

González-Doncel

2008

Scripta Materialia

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Section: Complete Revised Work Click Here To View Linked Referencesmentioning

confidence: 99%

“…Briefly, powder of 6061Al alloy of average particle size less than 45 mm [7] was mixed in a ball-mill with SiC whiskers 20-40 m in length and average diameter of 0.4 m [8]. The resulting blend was extruded into a cylindrical bar.…”

Section: Complete Revised Work Click Here To View Linked Referencesmentioning

confidence: 99%

Creep fracture and load transfer in metal–matrix composite

Fernández

González-Doncel

2008

Scripta Materialia

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“…In fact, there are two known mechanisms controlling deformation during high temperature creep of metals: dislocation climb and dislocation glide. 30,31 The creep strain rate (or the transformation reaction rate) will depend on the slowest between the controlling mechanisms. Therefore, x 1 (depending on a) must be chosen as the physically meaningful root of Eq.…”

Section: B Strain Rates As a Function Of Microstructural Parametersmentioning

confidence: 99%

“…A heating rate of 100 K/h until the creep testing temperature was applied, following previous works. 30 This is equivalent to a heat treatment prior to sample loading and provokes an averaged precipitation state in the material. Constant stress during sample elongation was guaranteed by means of an Andrade's cam, which reduces the applied load according with the sample section reduction.…”

Section: Experimental Creep Curvesmentioning

confidence: 99%

Primary and secondary creep in aluminum alloys as a solid state transformation

Fernández

Bruno

González-Doncel

2016

Journal of Applied Physics

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Despite the massive literature and the efforts devoted to understand the creep behavior of aluminum alloys, a full description of this phenomenon on the basis of microstructural parameters and experimental conditions is, at present, still missing. The analysis of creep is typically carried out in terms of the so-called steady or secondary creep regime. The present work offers an alternative view of the creep behavior based on the Orowan dislocation dynamics. Our approach considers primary and secondary creep together as solid state isothermal transformations, similar to recrystallization or precipitation phenomena. In this frame, it is shown that the Johnson-Mehl-AvramiKolmogorov equation, typically used to analyze these transformations, can also be employed to explain creep deformation. The description is fully compatible with present (empirical) models of steady state creep. We used creep curves of commercially pure Al and ingot AA6061 alloy at different temperatures and stresses to validate the proposed model. Published by AIP Publishing.[http://dx.doi.org/10.1063/1.4961524] I. CREEP OF METALSCreep of metals is a key topic for different industries such as energy, transport, or chemical. The creep behavior of pure metals and alloys has been extensively investigated in the past. This behavior is usually described through the accumulated plastic deformation e (t) as a function of time t under given conditions of applied stress, r, and temperature, T. Three regions are typically distinguished, namely, a primary creep region (where € eðtÞ < 0Þ; a secondary regime, also called steady state (where € eðtÞ ¼ 0); and a tertiary region (where € eðtÞ > 0) before creep rupture occurs (double dot denotes second time derivative). Many authors, as Evans, 1 reduce the steady state regime to a single turning point from the primary to the tertiary regions in the creep curve. This is, then, called the minimum creep rate state. For simplicity, however, we will refer throughout this work to a steady state region. Most of the investigations aimed at correlating the creep behavior with microstructural parameters of the alloy under study restrict their analysis to the steady state regime, where the creep rate is independent of time, i.e., one can write _ e ¼ _ e ss ðr; TÞ (dot denotes first time derivative).

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“…grain size, second phase particles, precipitates and texture, plays a dominant role in controlling the materials properties. The creep behavior and deformation mechanisms of these Al alloys have been extensively studied over a wide range of temperatures at moderate and low strain rates [7,8]. However, the deformation behavior at high temperature and high strain rate has received very limited attention [9,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure gradient after hot torsion deformation of powder metallurgical 6061 Al alloy

Eddahbi

Borrego

Monge

et al. 2012

Materials Science and Engineering: A

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Abstract:The microstructure and the texture of extruded 6061 Al alloy processed by powder metallurgy (PM), using three different initial powder particle sizes, have been studied after torsion deformation at 300 • C at strain rate of 6 s −1 . The initial extruded microstructure of the three alloys consisted of elongated grains confining substructure with a typical 1 1 1 + 1 0 0 fiber texture. After torsion deformation, the torque ( ) as a function of the equivalent strain (ε eq ) showed softening and the microstructure exhibited a gradient across the section so that the inner and outer zones contained sheared-elongated and small-equiaxed subgrains, respectively. It was observed that the equivalent strain to failure for the material processed using powder particles size of less than 45 m was of about ε eq ∼ 12, compared to ε eq ∼ 1 for material processed using powder particles size of less than 25 m. The microstructural changes during hot torsion deformation of PM 6061 Al alloy should involve continuous dynamic processes.

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Creep behavior of ingot and powder metallurgy 6061Al

Cited by 22 publications

References 51 publications

Creep fracture and load transfer in metal–matrix composite

Creep fracture and load transfer in metal–matrix composite

Primary and secondary creep in aluminum alloys as a solid state transformation

Microstructure gradient after hot torsion deformation of powder metallurgical 6061 Al alloy

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