Journal ArticleDOI
High temperature mechanical properties of an aluminum alloy containing Zn and Mg
TLDR
In this article, the authors studied the high temperature mechanical properties of as-cast Al-Zn-Mg using tensile and creep testing and found that the alloy exhibits class A creep behavior due to the viscous glide of dislocations.Abstract:
This paper studies the high temperature mechanical properties of as-cast Al–Zn–Mg using tensile and creep testing. Hot tensile tests were performed in the temperature and strain rate ranges of 350–400 °C and 10 −5 to 10 −3 s −1 respectively. Creep tests were carried out under constant load with initial stress ranging from 5 to 22 MPa, at 350 and 400 °C. The alloy exhibits class A creep behavior, due to the viscous glide of dislocations. The tensile flow curves, corrected to account for the effect of sample elongation on strain rate, also show a decline in stress commonly observed in Al–Mg alloys. The highest ductility and strain rate sensitivity were both observed for strain rates ranging from 10 −5 to 10 −4 s −1 . During hot deformation the alloy exhibits cavitation which increases with temperature. The analysis of these phenomena has shown that cavity growth is mainly controlled by plastic strain.read more
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Superplasticity, flow and fracture mechanism in an Al–12.7Si–0.7Mg alloy
TL;DR: In this paper, the superplastic behavior of an Al-12.7mass%Si−0.7 mass%Mg alloy was investigated under different conditions and a maximum elongation to failure of 379% was demonstrated with a strain rate sensitivity, m, of 0.52 and an activation energy for flow, Q, of 156.7 KJ/mol at 793 K at an initial strain rate of 1.67×10 −4 ǫs −1, which is close to the lattice diffusion activation energy of aluminum.
Journal ArticleDOI
Effect of grain-boundary θ-Al2Cu precipitates on tensile and compressive creep properties of cast Al–Cu–Mn–Zr alloys
TL;DR: In this article , the effect of micron-size intergranular precipitates on tensile and compressive creep was investigated on high-temperature Al-Cu-Mn-Zr (ACMZ) alloys.
Journal ArticleDOI
A new sustainable direct solid state recycling of AA1090 aluminum alloy chips by means of friction stir back extrusion process
TL;DR: In this article, the feasibility of solid-state recycling of pure aluminum AA1090 machining chips using FSE process is investigated, and a simulation was conducted in order to optimize the die design (spiral scroll of the plunge, hole size and bearing distance) and the process parameters in terms of plunge rotational speed and extrusion rate.
Journal ArticleDOI
Achieving excellent superplasticity of Mg-7Zn-5Gd-0.6Zr alloy at low temperature regime
Siqi Yin,Zhiqiang Zhang,Zhiqiang Zhang,Jiamin Yu,Zilong Zhao,Min Liu,Min Liu,Lei Bao,Lei Bao,Zheng Jia,Jianzhong Cui,Jianzhong Cui,Ping Wang,Ping Wang +13 more
TL;DR: The results reveal that a superior superplastic elongation of 863% is obtained at 250 °C and strain rate of 1.67 × 10−3 s−1 and the elongations of this alloy increases with the increasing tensile temperature.
Proceedings ArticleDOI
A sustainable solid state recycling of pure aluminum by means of friction stir extrusion process (FSE)
TL;DR: In this article, the feasibility of solid-state recycling of pure aluminum AA1099 machining chips using FSE process is investigated, and a FE simulation was conducted in order to optimize the die design and the process parameters in terms of plunge rotational speed and extrusion rate.
References
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Journal ArticleDOI
On the ductile enlargement of voids in triaxial stress fields
James R. Rice,D.M. Tracey +1 more
TL;DR: In this article, a variational principle is established to characterize the flow field in an elastically rigid and incompressible plastic material containing an internal void or voids, and an approximate Rayleigh-Ritz procedure is developed and applied to the enlargement of an isolated spherical void in a nonhardening material.
Journal ArticleDOI
Current issues in recrystallization: a review
Roger D. Doherty,D.A. Hughes,F.J. Humphreys,John J. Jonas,D. Juul Jensen,Michael E. Kassner,Wayne E. King,Terry R. McNelley,H.J. McQueen,Anthony D. Rollett +9 more
TL;DR: The current understanding of the fundamentals of recrystallization is summarized in this paper, which includes understanding the as-deformed state, nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recystallization, particle effects, and texture.
Book
Fundamentals of Creep in Metals and Alloys
TL;DR: In this paper, the authors describe the effect of impurities on five-power-law creep behavior in nanoscale and sub-microcrystalline materials and analyze the properties of fine-structured superplastic materials.
Journal ArticleDOI
Overview No. 3 Fracture-mechanism maps and their construction for f.c.c. metals and alloys
TL;DR: Fracture-mechanism maps are diagrams with tensile stress as one axis and temperature as the other, showing the fields of dominance of a given micromechanism of fracture: cleavage, ductile fracture, rupture, intergranular creep fracture, and so on as mentioned in this paper.