Journal ArticleDOI
The influence of compositional and microstructural variations on the mechanism of static fracture in aluminum alloys
G. G. Garrett,John F. Knott +1 more
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In this article, the effects of alloy purity and state of aging on the fracture mechanism and resultant toughness of pure Al-Cu alloys, and commercial duralumin were examined, and good agreement was obtained between experimental results of toughness and those predicted from a knowledge of the tensile properties.Abstract:
The object of the paper is to examine the effects of alloy purity and state of aging on the fracture mechanism and resultant toughness of pure Al-Cu alloys, and commercial duralumin. In pure alloys, the transition from a shear to an intergranular mode of fracture with overaging is associated with changes in the nature and size of the matrix precipitate, which affect the slip character. In the corresponding commercial purity alloys, no such fracture mode transition occurs. The presence of second-phase dispersoids inhibits planar slip, and in the overaged state inclusion-matrix interfaces present a suitable alternative site to the grain boundaries for strain accumulation, resulting in debonding leading to the initiation of voids, which subsequently grow and coalesce. The fracture toughness, as conventionally measured, indicates the material’s resistance to crack initiation rather than propagation and is effectively independent of fracture mode. The work hardening capacity has a marked effect on void size, and is shown to be a sensitive indicator of fracture toughness in both pure and commercial alloys. Based on a simple model, good agreement is obtained between experimental results of toughness and those predicted from a knowledge of the tensile properties.read more
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On the relationship between microstructure, strength and toughness in AA7050 aluminum alloy
TL;DR: In this article, the effect of process parameters such as quench rate and precipitation heat treatment on the compromise between the toughness and the yield strength of AA7050 aluminum alloy (AlZnMgCu) are investigated, as well as the anisotropy of this compromise in the rolling plane.
Journal ArticleDOI
Strength, deformation, fracture behaviour and ductility of aluminium-lithium alloys.
TL;DR: In this paper, the deformation characteristics and fracture behavior of aluminium alloys are examined with specific reference to ageing condition of the alloy, the matrix slip characteristics, and the nature, volume fraction and distribution of strengthening precipitates.
Journal ArticleDOI
Crack initiation and growth toughness of an aluminum metal-matrix composite
M. Manoharan,John J. Lewandowski +1 more
TL;DR: In this article, the effects of changes in matrix microstructure on crack initiation and growth toughness were determined on an Al-Zn-Mg-Cu alloy containing 0, 15, 20 percent by volume of SiC particulates.
Journal ArticleDOI
Effect of particle size on fracture toughness of SiC/Al composite material
Y. Flom,R.J. Arsenault +1 more
TL;DR: In this paper, the role of particle size on the fracture process was investigated in discontininuous SiC/Al composites with SiC particles of different sizes, and the results showed that fracture initiation fracture toughness does not depend on SiC particle size.
Journal ArticleDOI
Dispersion strengthened AlFeVSi alloys
References
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Journal ArticleDOI
On the relationship between critical tensile stress and fracture toughness in mild steel
TL;DR: In this paper, the critical value of tensile stress (a) for unstable cleavage fracture to the fracture toughness (K,,) for a high-nitrogen mild steel under plane strain conditions.
Journal ArticleDOI
Metallurgical factors affecting fracture toughness of aluminum alloys
G. T. Hahn,A. R. Rosenfield +1 more
TL;DR: The fracture toughness of aluminum alloys depends on a) the extent of the heavily strained region ahead of the crack tip, which is a function of the yield strength arad modulus, b) the size of the ligaments which is related tof c, the volume fraction of cracked particles, and c) the work of rupturing ligaments.
Journal ArticleDOI
An investigation of the plastic fracture of AISI 4340 and 18 Nickel-200 grade maraging steels
T. B. Cox,John R. Low +1 more
TL;DR: In this paper, the authors studied the mechanisms of plastic fracture in high-purity and commercial 18 Ni, 200 grade maraging steels and quenched and tempered AISI 4340 steels.
Journal ArticleDOI
The role of inclusions in ductile fracture and fracture toughness
TL;DR: In this paper, a dislocation model was developed compatible with this point of view, which yields a relation between the fracture strain and the volume fraction of the inclusions, which is the critical event in ductile fracture; it is immediately followed by spontaneous growth and coalescence of the voids.
Journal ArticleDOI
The influence of a precipitate-free zone on the mechanical properties of an Al-Mg-Zn alloy
TL;DR: In this paper, the influence of precipitate-free zones along grain boundaries on the mechanical properties is studied in the alloy Al-6% Zn-2% Mg.
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