نتایج جستجو برای: ultrafine grain surface

تعداد نتایج: 694927  

A microstructure consisting of ultrafine grained (UFG) ferrite with average grain size of ~ 0.7 µm and dispersed nano-sized carbides was produced by cold-rolling and tempering of the martensite starting microstructure in a low carbon steel. Subsequently, fine grained dual phase (DP) steel consisting of equiaxed ferrite grains with average size of ~ 5 µm and martensite islands with average size ...

حمید رضا جاهد مطلق, , رامین جهادی نائینی, , محمد صدیقی, ,

In this paper, the effect of Equal Channel Angular Pressing (ECAP) process on the structure and mechanical properties of AM30 magnesium alloy was studied. The results showed a considerable effect of ECAP process on creating an ultrafine grain size structure. Scanning Electron Microscope indicated that the grain size dropped from 20.4 µm in the extruded form to 7.2 µm in the first pass and 3.9 µ...

Journal: :The Annals of occupational hygiene 2004
Derk H Brouwer José H J Gijsbers Marc W M Lurvink

Recently, toxicological and epidemiological studies on health effects related to particle exposure suggest that 'ultrafine particles' (particles with an aerodynamic diameter of <100 nm) may cause severe health effects after inhalation. Although the toxicological mechanisms for these effects have not yet been explained, it is apparent that measuring exposures against mass alone is not sufficient...

Journal: :Acta biomaterialia 2010
Z Q Yao Yu Ivanisenko T Diemant A Caron A Chuvilin J Z Jiang R Z Valiev M Qi H-J Fecht

Equal channel angular pressing results in ultrafine-grained (approximately 200-500 nm) Ti with superior mechanical properties without harmful alloying elements, which benefits medical implants. To further improve the bioactivity of Ti surfaces, Ca/P-containing porous titania coatings were prepared on ultrafine-grained and coarse-grained Ti by micro-arc oxidation (MAO). The phase identification,...

Journal: :Materials transactions 2021

A laminated structured 2205 duplex stainless steel (DSS) with graded grain size was prepared via aluminothermic reaction and subsequent hot rolling deformation of 80% at 1000°C, its mechanical properties, strengthening toughening mechanism were studied. Our materials have extraordinary elongation 54% high tensile strength 990 MPa. The lamellar structure is characterized heterogeneous lamella au...

2015
Byungmin Ahn Enrique J. Lavernia Steven R. Nutt

The tensile properties and deformation response of an ultrafine-grained (UFG) Al–Mg alloy with bimodal grain structure were investigated using a micro-straining unit and a strain mapping technique. Atomized Al 5083 powder was ball-milled in liquid N2 to obtain a nanocrystalline (NC) structure, then blended with 50 wt.% unmilled coarse-grained (CG) powder, and consolidated to produce a bimodal g...

Journal: :Journal of Materials Research and Technology 2021

Journal: :Metallurgical and Materials Transactions A 2016

1998
K. Hono E. Abe T. Kumagai H. Harada

As Ti rich Ti-Al alloy shows ductile nature with the α2 + γ lamellar structure [1], the mechanism of microstructural evolution in Ti-Al alloys has attracted much interest. Since the lamellar structure is formed by the continuous cooling in industrial processes, cooling rate dependence of α → γ and α → α2 + γ transformations has been extensively studied by many researchers [2-5]. Wang et al. [2,...

Journal: :Materials research letters 2021

A nano/ultrafine grained immiscible Fe-Cu alloy was produced using selective laser melting (SLM) with an average grain size of 250?nm and many 50–100?nm, the finest ever achieved additive man...

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