نتایج جستجو برای: ultrafine grained

تعداد نتایج: 27085  

Journal: Journal of Ultrafine Grained and Nanostructured Materials 2017
Abbas Zarei-Hanzaki, Seyed Mahmood Fatemi,

The application of magnesium alloys is greatly limited because of their relatively low strength and ductility. An effective way to improve the mechanical properties of magnesium alloy is to refine the grains. As the race for better materials performance is never ending, attempts to develop viable techniques for microstructure refinement continue. Further refining of grain size requires, however...

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1997
Ruslan Z. Valiev

Ultrafine-grained (UFG) nanostructured materials having grain sizes of tens and hundreds of nanometers recently have aroused interest among researchers in the materials science field. With respect to their mechanical properties, one would hope to be able to obtain the extremely strong states that can be expected in the case of strong grain refinement according to the Hall-Petch relationship (Gl...

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Journal: Journal of Ultrafine Grained and Nanostructured Materials 2016
Abdoulmajid Eslami, Behzad Sadeghian, Fathallah Karimzadeh Reihane Nafar Dehsorkhi, Soheil Sabooni

In the present study, an ultrafine grained (UFG) 304L stainless steel with the average grain size of 300 nm was produced by a combination of cold rolling and annealing. Weldability of the UFG sample was studied by Nd: YAG laser welding under different welding conditions. Taguchi experimental design was used to optimize the effect of frequency, welding time, laser current and laser pulse duratio...

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Journal: Journal of Advanced Materials and Processing 2014
A. vajd, B. Mosadeg Mehdi Shaban Ghazani,

Equal channel angular pressing is the most promising method of severe plastic deformation with the capability of producing ultrafine grained materials. These materials exhibit improved mechanical and physical properties compared with their coarse grained counter parts.The temperature variation in the sample during ECA-pressing is a key factor determining the final microstructure and mechanical ...

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2015
Jie Xu Jianwei Li Xiaocheng Zhu Guohua Fan Debin Shan Bin Guo

Micro-forming with ultrafine-grained (UFG) materials is a promising direction for the fabrication of micro-electro-mechanical systems (MEMS) components due to the improved formability, good surface quality, and excellent mechanical properties it provides. In this paper, micro-compression tests were performed using UFG pure aluminum processed by equal-channel angular pressing (ECAP) with subsequ...

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Journal: :journal of ultrafine grained and nanostructured materials 0
reihane nafar dehsorkhi department of materials engineering, isfahan university of technology, isfahan, 84156-83111, iran. soheil sabooni department of materials engineering, isfahan university of technology, isfahan, 84156-83111, iran. abdoulmajid eslami department of materials engineering, isfahan university of technology, isfahan, 84156-83111, iran. fathallah karimzadeh department of materials engineering, isfahan university of technology, isfahan, 84156-83111, iran. behzad sadeghian department of materials engineering, isfahan university of technology, isfahan, 84156-83111, iran.

in the present study, an ultrafine grained (ufg) 304l stainless steel with the average grain size of 300 nm was produced by a combination of cold rolling and annealing. weldability of the ufg sample was studied by nd: yag laser welding under different welding conditions. taguchi experimental design was used to optimize the effect of frequency, welding time, laser current and laser pulse duratio...

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Journal: :Materials Science Forum 2017

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Journal: :Letters on Materials 2015

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Journal: :Materials Research 2013

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Journal: :Journal of Materials Research and Technology 2012

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