Topic
Hardening (metallurgy)
About: Hardening (metallurgy) is a research topic. Over the lifetime, 25584 publications have been published within this topic receiving 376012 citations.
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TL;DR: In this article, a ternary phase was observed in binary Mg-1Ca-1Zn alloy, which appears isomorphous with Mg2Ca (space group P63/mmc).
201 citations
TL;DR: In this paper, a viscoplastic self-consistent (VPSC) formulation incorporating length scales associated with spacing between twin lamellae (or grain size and dislocation cell size) as well as statistical dislocation storage and dynamic recovery was introduced.
201 citations
TL;DR: In this article, the effect of the particle size, codeposition percentage of SiC and type of imposed current on microhardness as well as on the microstructure of the electrodeposits were investigated.
Abstract: Pure Ni and nickel matrix composite electrocoatings containing micron- and nano-SiC particles (1 μm and 20 nm respectively) were produced under direct and pulse current conditions from an additive-free Watts type bath. The effect of the particle size, codeposition percentage of SiC and type of imposed current on the microhardness as well as on the microstructure of the electrodeposits were investigated. Ni/SiC composite deposits prepared under either direct or pulse current conditions exhibited a considerable strengthening effect with respect to pure Ni coatings. The improved hardness of composite coatings was associated to specific structural modifications of Ni crystallites provoked by the adsorption of H+ on the surface of SiC particles, thus leading to a (211) texture mode of Ni crystal growth. Pulse electrodeposition significantly improved the hardness of the Ni/SiC composite coatings, especially at low duty cycles, in which grain refinement and higher SiC incorporation (vol. %) was achieved. The enhanced hardness of Ni/nano-SiC deposits, as compared to Ni/micron-SiC composites, was attributed to the increasing values of the number density of embedded SiC particles in the nickel matrix with decreasing particle size. In addition, the observed hardening effects of the SiC particles might be associated to the different embedding mechanisms of the particles, which could be characterized as inter-crystalline for micron-SiC and partially intra-crystalline for nano-SiC particles.
200 citations
TL;DR: In this article, the intrinsic stability of plastic deformation on the local scale has been examined with the help of standard methods of nonlinear analysis, such as yield points and the occurrence of necking, slip lines and slip bands also appear to be interpretable in terms of local instability of plastic flow.
200 citations
TL;DR: In this paper, the Bauschinger effect, cyclic hardening/softening, strain range effect, nonproporitonal hardening, and strain ratcheting are discussed based upon representative experimental observations on several commonly used engineering materials.
199 citations