Journal ArticleDOI
Superplasticity in doubly extruded magnesium composite ZK60/SiC/17p
Reads0
Chats0
TLDR
In this paper, a doubly extruded magnesium-based composite, ZK60 reinforced with 17 vol.-%SiC particles, was investigated and the influences of strain rate on the flow stress and elongation in the composite were characterised.Abstract:
Superplasticity in a doubly extruded magnesium based composite, ZK60 reinforced with 17 vol.-%SiC particles, was investigated. The influences of strain rate on the flow stress and elongation in the composite were characterised. It was found that the composite exhibited superplasticity (elongation > 400%) at high strain rates (∼ 0.1 s−1). In addition, the material showed a high strain rate sensitivity of 0.5 and an activation energy of 81 kJ mol−1 in the superplastic region. Based upon these results, it was proposed that the dominant deformation mechanism is grain boundary sliding accommodated by a grain boundary diffusion process. A comparison of the superplastic behaviour was also made between the doubly extruded and singly extruded composites.read more
Citations
More filters
Journal ArticleDOI
Review Processing and mechanical properties of fine-grained magnesium alloys
TL;DR: In this article, fine-grained magnesium-based materials with high strength and high ductility at room temperature are obtained by grain refinement, and a very small grain size of less than 1 μm is obtained by equal channel angular extrusion.
Journal ArticleDOI
Superplasticity in thin magnesium alloy sheets and deformation mechanism maps for magnesium alloys at elevated temperatures
TL;DR: In this paper, the deformation mechanism maps for face-centered cubic and bodycentered cubic metals were reviewed and found to be deficient in predicting deformation behavior of magnesium alloys with hexagonal close-packed crystal structure.
Journal ArticleDOI
Effect of temperature and grain size on the dominant diffusion process for superplastic flow in an AZ61 magnesium alloy
TL;DR: In this article, the effect of temperature and grain size on superplastic flow was investigated using a relatively coarse-grained (∼20μm) Mg-Al-Zn alloy for the inclusive understanding of the dominant diffusion process.
Journal ArticleDOI
Microstructure and mechanical properties of a Mg-4Y-3RE alloy processed by thermo-mechanical treatment
TL;DR: In this article, a Mg-4Y-3RE alloy was used for hot extrusion at 573 or 673 K and artificial aging at 473 K to achieve high strength of 370 MPa at room temperature.
Journal ArticleDOI
Superplastic deformation mechanism in powder metallurgy magnesium alloys and composites
TL;DR: In this article, the parametric dependencies for superplastic flow in powder metallurgy (PM) magnesium alloys and composites were characterized so as to elucidate the deformation mechanism.
References
More filters
Journal ArticleDOI
Diffusion-accommodated flow and superplasticity
M.F. Ashby,R. A. Verrall +1 more
TL;DR: In this article, a new mechanism for superplastic deformation is described and modelled, which differs fundamentally from Nabarro-Herring and Coble creep in a topological sense: grains switch their neighbors and do not elongate significantly.
Journal ArticleDOI
High temperature creep of Ni-20Cr-2ThO2 single crystals
R.W. Lund,William D. Nix +1 more
TL;DR: The high temperature creep properties of single crystals of Ni-20Cr-2ThO 2 have been investigated in the temperature range 650-1300°C in this article, where single crystal tensile specimens were cut from plates having a large elongated grain structure and constant stress vacuum creep tests were conducted at various stresses and temperatures.
Journal ArticleDOI
Interpretation of superplastic flow in terms of a threshold stress
TL;DR: In this paper, a sigmoidal relationship between stress and strain rate is noted and the mechanical behavior has been divided into three regions: low-stress region (region I), intermediatestress region (the superplastic region or region II), and high-stress region(region III).
Journal ArticleDOI
Superplasticity in a 17 vol.% SiC particulate-reinforced ZK60A magnesium composite (ZK60/SiC/17p)
TL;DR: In this article, the superplastic properties of a 17 vol.% SiC particulate-reinforced ZK60A magnesium composite (ZK60/SiC/17p) have been studied.