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Effect of Al substitution on phase evolution in synthesized Mg_(2)Cu nanoparticles

International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 63-71页

作者： Elham Mohseni-Sohi farshid kashani bozorg School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranTehranPO Box 11155/4563Iran

The effect of Mg replacement with Al on the discharge capacity of Mg_(2)Cu powder mixture was *** mixture of nano-crystalline powder was prepared via mechanical alloying(MA)technique with a high energy planetary ball *** addition,different moles of Al(0.05,0.1,0.15,0.2,and 0.3 M)were substituted to Mg_(2)Cu powder.X-ray diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM)were used to analyze changes in structure,morphology,and grain *** obtained powder was utilized as an anode in a nickel-metal hydride battery(Ni-MH).In the specimens with 0.05 M Al content,the orthorhombic structure of Mg_(2)Cu is emerged after 5 h *** results reveal that more than 0.1 M Al substitution leads to an appearance of MgCu_(2) *** substi-tution does not affect microstructure uniformity;however,it causes a decrease in crystalline size and lattice *** selected area diffraction(SAD)pattern elucidates that the electrode with the Mg_(1.9)Al_(0.1)Cu chemical composition and 20 h milling has the maximum discharge capacity.

关键词： Mg_(2)Cu mechanical alloying nanocrystalline discharge capacity

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Surface Modification of Titanium by Producing Ti/TiN Surface Composite Layers via FSP

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Acta Metallurgica Sinica(English Letters) 2017年第6期30卷 550-557页

作者： Ali Shamsipur Seyed-farshid kashani-bozorg Abbas Zarei-Hanzaki Department of Mining and Metallurgical Engineering Amirkabir University of Technology School of Metallurgy and Materials Engineering University College of Engineering University of Tehran

In this paper, we report the use of blowing nitrogen gas for the successful fabrication of a composite layer composed of Ti/TiN on a substrate of commercially pure titanium （cp-2） using the friction stir processing technique. The prepared composite layer was characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectrometry. The maximum microhardness of the Ti/TiN composite reached 1024 HV, which is 6.4 times higher than that of the titanium substrate. The results of wear test indicated that the Ti/TiN composite layer possesses excellent abrasive and adhesive wear resistance because of the formation of the TiN and its high hardness.

关键词： Friction stir processing Surface composite Titanium TiN Hardness Wear resistance X- ray diffraction

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Effects of TIG Surface Melting and Chromium Surface Alloying on Microstructure, Hardness and Wear Resistance of ADI

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Journal of Iron and Steel Research International 2008年第4期15卷 86-94页

作者： A Amirsadeghi M Heydarzadeh Sohi S F kashani bozorg School of Metallurgy and Materials Engineering University of Tehran Tehran Iran

Microhardness and wear resistance of different rnicrostructures formed by TIG （tungsten inert gas） surface melting and chromium surface alloying （using ferrochromium） of ADI （austempered ductile iron） were studied. Surface melting resulted in the formation of a ledeburitic structure in the melted zone, and this structure has a hardness up to 896 HV as compared to 360 HV in that of ADI. Moreover, chromium surface alloying resulted in the formation of different structures including：（1） a hypereutectic structure consisting of primary （Fe,Cr）7C3 carbides and a eutectic matrix of transformed austenite （into martensite and retained austenite）, as also （Fe,Cr）7C3 carbides, with a hardness of 1078 HV; （2） a hypoeutectic structure consisting of the same eutectic along with transformed primary austenite, with a hardness of 755 HV; and （3） a ledeburitic structure with an acicular morphology and a hardness of 896 HV. The results also indicated that surface melting reduced the wear rate of the ADI by approximately 37%. Also, chromium surface alloying yielded a superior wear behavior and reduced the wear rate of the treated specimens by about 38% and 70%, depending on the structures formed.

关键词： ductile iron surface alloying surface melting chromium wear resistance

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