Microstructural aspects of fracture by dimpled rupture

Stone, R. H. Van; Cox, T. B.; Low, J. R.; Psioda, J. A.

doi:10.1179/imtr.1985.30.1.157

Cited by 79 publications

(81 citation statements)

References 59 publications

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“…This trend is not only observed in aluminum alloys, [5,7,36] but also exists commonly in other metals and alloys that contain nonmetallic inclusions. [37,38] In particular, the fitted functional relationship of the volume fraction of inclusions and tensile ductility in copper [39] is nearly the same as the present modeled curves for aluminum alloys.…”

Section: Volume Fraction Of Constituentsmentioning

confidence: 70%

“…On the one hand, it is suggested that the void sheets, which come from the decohesion of dispersoids from the matrix, truncate primary void growth and preclude a large strain accumulation decreasing the ductility and fracture toughness. [8] On the other hand, some experimental results showed that the introduction of dispersoids could promote the ductility of materials by increasing homogeneity in dislocation slip behavior. [15][16][17][18] The most effective approach to display explicitly the independent influence and to analyze the coupled influence from every population of second-phase particles is to construct an entire model, in which quantitative relationships are revealed between ductility and the volume fractions, sizes, and shapes of the three differently sized second-phase particles.…”

Section: Introductionmentioning

confidence: 98%

“…[7] The dispersoids also directly influence crack growth and void coalescence in the deformation and fracture of material. [8] Precipitates are the major contributors to the strength of alloys. They are closely associated with the slip and deformation capability and, thus, the ductility and fracture toughness of alloys.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influences of multiscale-sized second-phase particles on ductility of aged aluminum alloys

Liu

Zhang

Ding

et al. 2004

Metall Mater Trans A

109

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Commercially aged aluminum alloys commonly contain second-phase particles of three class sizes, and all contribute appreciably to the mechanical properties observed at the macroscopic scale. In this article, a multiscale model was constructed to describe the individual and coupling influences of the three types of second-phase particles on tensile ductility. The nonlinear relationships between the parameters of particles, including volume fraction, size, aspect ratio, shape, and ductility, were then quantitatively established and experimentally validated by the measured results from disc-shaped precipitate containing Al-Cu-Mg alloys and needle-shaped precipitate containing Al-Mg-Si alloys, as well as by using other researchers' previously published results. In addition, we discuss extending this model to predict the fracture toughness of aluminum alloys.

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Section: Volume Fraction Of Constituentsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

The influences of multiscale-sized second-phase particles on ductility of aged aluminum alloys

Liu

Zhang

Ding

et al. 2004

Metall Mater Trans A

109

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“…The coarse iron-rich and silicon-rich constituent particles and traces of magnesium-rich insoluble phases tend to either crack easily because of their intrinsic brittleness or decohere at their interfaces (Ref [34][35][36]. Interracial strength is a dominant factor in the nucleation of the microscopic voids.…”

Section: Discussionmentioning

confidence: 99%

Mechanisms governing deformation and damage during elevated-temperature fatigue of an aluminum-magnesium-silicon alloy

Srivatsan

Anand

Narendra

1997

J. of Materi Eng and Perform

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The cyclic deformation and fracture characteristics of aluminum alloy 6061 are presented and discussed. The specimens were cyclically deformed using fully reversed tension-compression loading under total strain-amplitude control, over a range of temperatures. The alloy showed evidence of softening to failure at all test temperatures. The degree of softening during fully reversed deformation increased with test temperature. The presence of shearable matrix precipitates results in a microstructure that offers a local decrease in resistance to dislocation movement, causing a progressive loss of strengthening contributions to the matrix. At elevated temperatures, localized oxidation and embrittlement at the grain boundaries are exacerbated by the applied cyclic stress and play an important role in accelerating crack initiation and subsequent crack propagation. The fracture behavior of the alloy is discussed in light of competing influences of intrinsic microstructural effects, deformation characteristics arising from a combination of mechanical and microstructural contributions, cyclic plastic strain amplitude and concomitant response stress, and the test temperature. I

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“…[3] Void-sheet fracture begins with low-strain void nucleation at constituents followed by primary void growth, and involves the interaction of strain localization between favorably oriented voids and secondary void nucleation, growth, and coalescence along a sheet of submicron particles in the path of localized strain. [5][6][7][8] For IM aluminum alloys, dispersoids play the dominant role in void-sheet damage. Intrinsic fracture strain is degraded by void sheeting, which truncates primary void growth and precludes a large accumulation of strain.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent void-sheet fracture in Al-Cu-Mg-Ag-Zr

Haynes¹,

Gangloff

1998

Metall Mater Trans A

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Previous research showed that tensile fracture strain increases as temperature increases for AA2519 with Mg and Ag additions, because the void-sheet coalescence stage of microvoid fracture is retarded. The present work characterizes intravoid-strain localization (ISL) between primary voids at large constituents and secondary-void nucleation at small dispersoids, two mechanisms that may govern the temperature dependence of void sheeting. Most dispersoids nucleate secondary voids in an ISL band at 25 ЊC, promoting further localization, while dispersoid-void nucleation at 150 ЊC is greatly reduced. Increased strain-rate hardening with increasing temperature does not cause this behavior. Rather, a stress relaxation model predicts that flow stress and strain hardening decrease with increasing temperature or decreasing strain rate due to a transition from dislocation accumulation to diffusional relaxation around dispersoids. This transition to softening causes a sharp increase in the model-predicted applied plastic strain necessary for dispersoid/matrix interface decohesion. This reduced secondary-void nucleation and reduced ISL at elevated temperature explain retarded void sheeting and increased fracture strain.

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Microstructural aspects of fracture by dimpled rupture

Cited by 79 publications

References 59 publications

The influences of multiscale-sized second-phase particles on ductility of aged aluminum alloys

The influences of multiscale-sized second-phase particles on ductility of aged aluminum alloys

Mechanisms governing deformation and damage during elevated-temperature fatigue of an aluminum-magnesium-silicon alloy

Temperature-dependent void-sheet fracture in Al-Cu-Mg-Ag-Zr

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