Abnormal grain growth can occur in polycrystalline materials with only a fraction of grains growing drastically to consume other grains. Here we report abnormal ultrafine grained metal rarely explored high-cycle loading regime at ambient temperature. is observed electroplated Ni microbeams average initial sizes less than 640 nm under large number cycles (up 109) low strain amplitudes (< 0.3%). ...

Ti(β) alloys have become an important class in the biomedical field due to low Young’s modulus, excellent physical properties, and biocompatibility. However, their like biocompatibility and, also, wear resistance, can be still enhanced. To improve those a composites approach applied. This research shows new of composite structure fabrication by powder metallurgy methods which for stabile yttria...

An ultrafine grained dual phase (UFG DP) steel containing niobium was produced by a new route utilizing simple cold-rolling and subsequent intercritical annealing of ferrite/martensite duplex starting structures. The effects of intercritical holding time on the microstructural evolutions and mechanical properties were studied. The results showed that increasing intercritical holding time enhnac...

Microstructure, texture and tensile properties of ultrafine/nano grained 1 magnesium alloy processed by accumulative back extrusion 2 3 S.M. Fatemi, A. Zarei-Hanzaki, J.M. Cabrera 4 5 a School of Mechanical Engineering, Shahid Rajaee Teacher Training University, 136-16785, Tehran, Iran 6 b Department of Metallurgical & Materials Engineering, University of Tehran, 515-14395, Tehran, Iran 7 c Dep...

The effect of pre-existing nano sized precipitates on the mechanisms and rate of grain refinement has been investigated during the severe plastic deformation. A binary Al–0.2Sc alloy, containing coherent Al3Sc particles, of 3.62 nm in diameter has been deformed by accumulative roll bonding up to 10 cycles. The resulting deformed structures were quantitatively analyzed using electron backscatter...

BACKGROUND Ultrafine particles have been hypothesised to be an important contributing factor in the toxicity and adverse health effects of particulate air pollution (PM10) and nanoparticles are used increasingly in industrial processes. AIMS To compare the ability of ultrafine and fine particles of titanium dioxide and carbon black to induce inflammation, cause epithelial injury, and affect t...