Journal ArticleDOI
Deformation behavior and plastic instabilities of ultrafine-grained titanium
TLDR
In this article, the deformation behavior of ultrafine-grained (UFG) Ti samples has been systematically characterized, including strain hardening, strain rate dependence of flow stress, deformation/failure mode, and tensile necking instability.Abstract:
Ultrafine-grained (UFG) Ti samples have been prepared using equal channel angular pressing followed by cold rolling and annealing. The deformation behavior of these materials, including strain hardening, strain rate dependence of flow stress, deformation/failure mode, and tensile necking instability, have been systematically characterized. The findings are compared with those for conventional coarse-grained Ti and used to explain the limited tensile ductility observed so far for UFG or nanocrystalline metals.read more
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Mechanical properties of nanocrystalline materials
TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.
Journal ArticleDOI
High tensile ductility in a nanostructured metal.
TL;DR: A thermomechanical treatment of Cu is described that results in a bimodal grain size distribution, with micrometre-sized grains embedded inside a matrix of nanocrystalline and ultrafine (<300 nm) grains, which impart high strength, as expected from an extrapolation of the Hall–Petch relationship.
Journal ArticleDOI
Paradox of strength and ductility in metals processed by severe plastic deformation
TL;DR: In this paper, a combination of high strength and high ductility produced in metals subject to severe plastic deformation (SPD) was shown to enable deformation by newmechanisms.
Journal ArticleDOI
Three strategies to achieve uniform tensile deformation in a nanostructured metal
Y.M. Wang,Evan Ma +1 more
TL;DR: In this article, the authors demonstrate three strategies to achieve relatively large stable tensile deformation in nanostructured metals, using the pure Cu processed by equal channel angular pressing as a model.
Journal ArticleDOI
Heterogeneous materials: a new class of materials with unprecedented mechanical properties
Xiaolei Wu,Yuntian Zhu +1 more
TL;DR: In this paper, the authors present a perspective on heterogeneous materials, a new class of materials possessing superior combinations of strength and ductility that are not accessible to their homogeneous counterpar...
References
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Journal ArticleDOI
Theory of the tensile test
TL;DR: In this paper, the tensile test is re-examined with special attention to the influence of strain rate sensitivity of the flow stress, and explicit formulae are deduced for the measured variables of the test in terms of the phenomenological parameters of the material.
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Ductility of Nanostructured Materials
TL;DR: In this article, it has been predicted that extrapolation of the grain size, or the scale of the microstructure, to the nanoscale will lead to both strengthening and an increase in ductility.
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Influence of ECAP routes on the microstructure and properties of pure Ti
TL;DR: In this paper, the influence of ECAP routes on the microstructures and properties of commercially pure Ti billets was studied, including surface quality, micro-structures, microhardness, tensile properties, anisotropy, and thermal stability.
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Mechanical properties and deformation mechanisms of a commercially pure titanium
TL;DR: In this article, the mechanical behavior of a commercially pure titanium (CP-Ti) is systematically investigated in quasi-static (Instron, servohydraulic) and dynamic (UCSD's recovery Hopkinson) compression.
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The high-strain-rate response of alpha-titanium: experiments, deformation mechanisms and modeling
TL;DR: In this article, the high-strain-rate mechanical response of α-titanium is examined in terms of the underlying deformation mechanisms that govern its macroscopic behavior.