Journal ArticleDOI
Grain growth behaviour of the Al-Cu eutectic alloy during superplastic deformation
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TLDR
Grain growth behavior of the Al-Cu eutectic alloy was investigated as a function of strain (e), strain rate and deformation temperature (T) over as discussed by the authors, where grain size increases with increase in strain and temperature.Abstract:
Grain growth behaviour of the Al-Cu eutectic alloy was investigated as a function of strain (e), strain rate
$$(\dot \varepsilon )$$
and deformation temperature (T) over
$$\dot \varepsilon $$
= 10−2 s−1 and T=400 to 540°C The grain size increases with increase in strain and temperature Upon deformation to a fixed strain, the grain growth is generally seen to be more at lower strain rates The rates of overall grain growth
$$(\dot d_{\varepsilon ,t} )$$
and due to deformation alone
$$(\dot d_\varepsilon )$$
, however, increase with increasing strain rate according to
$$\dot d_{\varepsilon ,t} \propto \dot \varepsilon ^{086} $$
and
$$\dot d_{\varepsilon ,t} \propto \dot \varepsilon ^{064} $$
, respectively The increase in the grain growth rate with strain rate is attributed primarily to the shorter time involved at higher strain rate for reaching a fixed strain The activation energy for grain growth under superplastic conditions is estimated to be 79 kJ mol−1read more
Citations
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Journal ArticleDOI
Low Temperature Superplasticity and Its Deformation Mechanism in Grain Refinement of Al-Mg Alloy by Multi-Axial Alternative Forging
TL;DR: In this article, the role of grain boundary sliding (GBS), intragranular deformation and the change of microstructure during superplastic deformation have been investigated for ultrafine-grained Al-Mg alloy with a grain size of less than 1 μm using Multi-Axial Alternative Forging (MAF) technique.
Journal ArticleDOI
Development of hardness homogeneity and superplastic behavior in an aluminum–copper eutectic alloy processed by high-pressure torsion
TL;DR: In this paper, an Al-33% Cu eutectic alloy was processed by high pressure torsion (HPT) at a pressure of 6.0 GPa for 1/4 to 10 turns, and tensile tests were conducted at a temperature of 723 K on specimens processed through 5 and 10 turns of HPT.
Journal ArticleDOI
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
Study of dynamic grain growth by electron microscopy and EBSD.
TL;DR: Of a particular interest are results related to behaviour of CuAl2 in superplastic Al‐33wt%Cu during deformation, including several problems with the use of EBSD in this alloy.
Journal ArticleDOI
Effect of hydrogen on high temperature flow behavior of near α-Ti alloy
S.M. Jagadeesh Babu,Bhagwati Prasad Kashyap,Nityanand Prabhu,Rajeev Kapoor,R.N. Singh,J.K. Chakravartty +5 more
TL;DR: In this paper, the effect of hydrogen on high temperature flow behavior of VT20, a near α-Ti alloy, was studied using differential strain rate compression tests, and the results indicated that the deformation mechanism is the grain boundary sliding accommodated by lattice diffusion.
References
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Journal ArticleDOI
Cavitation behavior of an Al−Cu eutectic alloy during superplastic deformation
TL;DR: In this article, the cavities were spherical in most cases, which was attributed to the diffusion-controlled cavity growth mechanism and its modification when the cavity size reaches the size of a grain.
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