On the Hall–Petch relationship in a nanostructured Al–Cu alloy

Shanmugasundaram, T.; Heilmaier, Martin; Murty, B.S.; Sarma, V. Subramanya

doi:10.1016/j.msea.2010.08.070

Cited by 197 publications

(62 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…is the average grain size and k is a material-dependent constant (here k is taken as 130 MPa μm / [29]), the increase of strength by grain refinement is estimated to be ~184 MPa for the 4P sample (vs. ~20 MPa for the as-homogenized sample).…”

Section: Tensile Propertiesmentioning

confidence: 99%

The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy

Jia

Bjørge

Marthinsen

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

An Al-5 wt.% Cu alloy supersaturated with Cu in solid solution was subjected to equal channel angular pressing (ECAP). The microstructural evolution was systematically investigated by backscattered electron (BSE) imaging, electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). It is revealed that a bimodal grain structure composed of coarse micron-sized grains and submicron-sized grains was developed after four passes of ECAP. Tensile testing showed that a high ultimate tensile strength of ~500 MPa, a high elongation to failure of ~28% and a uniform elongation of ~5% were achieved simultaneously. The deformation behaviour and the grain structure evolution during ECAP, the strengthening mechanisms of the as-deformed material, and especially, the role played by a high content of Cu have been discussed.

show abstract

Section: Tensile Propertiesmentioning

confidence: 99%

The deformation and work hardening behaviour of a SPD processed Al-5Cu alloy

Jia

Bjørge

Marthinsen

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…[17][18][19][20] Although the analyses presented here focus primarily on the HallPetch mechanism at work, all four mechanisms contribute to the strengthening of this particular cryomilled alloy. [6,21,22] The vast differences in grain size, grain boundary area, grain boundary orientation, and chemistry of the cryomilled vs conventional materials complicates a simple Hall-Petch analysis; hence, a discussion of the other three mechanisms is required, as they contribute differently in the conventional alloy vs the cryomilled alloys. A general equation (Eq.…”

Section: A Strengthening Mechanismsmentioning

confidence: 99%

Influence of Process Parameters on the Mechanical Behavior of an Ultrafine-Grained Al Alloy

Topping

Ahn

et al. 2011

Metall Mater Trans A

View full text Add to dashboard Cite

Aluminum alloys with nanocrystalline (NC) and ultrafine grain (UFG) size are of interest because of their strengths that are typically 30 pct greater than conventionally processed alloys of the same composition. In this study, UFG AA 5083 plate was prepared by quasi-isostatic (QI) forging of cryomilled powder, and the microstructure and mechanical behavior was investigated and compared with the behavior of coarse-grained AA 5083. Forging parameters were adjusted in an effort to strengthen the UFG material while retaining some tensile ductility. Different forging parameters were employed on three plates, with approximate dimensions of 254 mm diameter and 19 mm thickness. The overarching goal of the current effort was to increase strength through minimized grain growth during processing while maintaining ductility by breaking up prior particle boundaries (PPBs) with high forging pressures. Mechanical tests revealed that strength increased inversely with grain size, whereas ductility for some of the experimental materials was preserved at the level of the conventional alloy. The application of the Hall-Petch relationship to the materials was studied and is discussed in detail with consideration given to strengthening mechanisms other than grain size, including dispersion (Orowan), solid solution, and dislocation strengthening.

show abstract

“…Frictional stress and k y coefficient can be significantly influenced by other strengthening mechanisms. For example, the alloying of Al with Cu resulted in an decrease of the Hall Petch coefficient (k y ) from 0.6-0.9 MPa √m for pure nanostructured Al down to 0.13 MPa√ m for UFG Al-4%Cu [76].…”

Section: Grain Boundary Strengtheningmentioning

confidence: 99%