Walid Hanna

Military Technical College

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Farghalli A. Mohamed

University of California, Irvine

Mariano Bonopera

Juan Ignacio D'Iorio

Universidad Nacional de La Plata

Carlos Alejandro Di Bernardi

Polytechnic University of Bari

Matías A. Chapela

Khinlay Maung

University of California, Irvine

Joaquín Piechocki

Universidad Nacional de La Plata

Ehab A. El‐Danaf

Cairo University

Laith K. Abbas

University of Technology - Iraq

Abdulhakim A. Almajid

Prince Sultan University

Cooperative Institutions

University of California, Irvine

King Saud University

Universidad Nacional de La Plata

University of California System

Irvine University

University of Technology - Iraq

Centre National de la Recherche Scientifique

University of California, Los Angeles

Material Sciences (United States)

University of Southern California

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Determinación de la contaminación gaseosa en el Aeropuerto Internacional de Ezeiza

Matías A. Chapela Mariano Bonopera Juan Ignacio D'Iorio Walid Hanna Carlos Alejandro Di Bernardi

Existen diversos organismos que intentan definir lineas de accion en funcion de la caracterizacion actual de la actividad humana y de sus respectivas proyecciones. En este contexto podemos mencionar al Panel Intergubernamental para el Cambio Climatico (IPCC) de la World Meteorological Organization (WMO), a la Convencion Marco de las Naciones Unidas sobre el Cambio Climatico (CMNUCC) de la ONU cuya preocupacion fundamental se centra en los gases efecto invernadero (GEI: H2O, CO2, CH4, NOx, O3, CFC, otros); y la Organizacion Internacional de Aviacion Civil (OACI) de la ONU que tiene, entre otros, injerencia directa sobre los aportes del transporte aereo prestando especial atencion a residuos tales como el HC, CO, NOx, entre otros contaminantes gaseosos .

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Study of Polymer Quenchants Effect on Some Properties of Stainless Steel alloy (316L).

Engineering and Technology Journal (2009)

Walid Hanna Laith K. Abbas Manar A. Najim

This study is concerned with the effect of polymer quenching on someproperties of an austenitic stainless steel alloy (316L). Three different operationsof heat treatment have been done including quenching, quenching with temperingand quenching with freezing. A comparison has been done between the effect ofpolymeric quenchant i.e. water solution of poly vinyl alcohol (PVA)and theconventional quenchants represented by distilled water, engine oil and food oil inhaving better properties. Tests have been done to the original and heat treatedspecimens which were Brinell hardness test, wear rate test and thermalconductivity test. Results had revealed that the heat treatments generally enhancethe properties especially the treatment of quenching with freezing and in mostcases the polymeric quenchants gave better results than the conventionalquenchants. Also a simulation to the results of the experimental work has beendone by using the (Visual Basic language), and the results gave us an indication tothe behaviour of specimens’ properties at different concentrations of polymericquenchants over the range used in the experimental work, beside the greatpossibilities of the program in display the experiments which help in trainingengineers in heat treatment and testing fields.

Brinell scale

Cooling curve

Distilled water

Austenitic stainless steel

Brass

10.30684/etj.27.10.20

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Behavior and Microstructure in Cryomilled Aluminum alloy Containing Diamondoids Nanoparticles

PhDT (2013)

Walid Hanna

Diamondoid

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Effect Of Diamantane On The Thermal Stability Of Cryomilled Aluminum Alloy

Advanced Materials Letters (2019)

Walid Hanna Farghalli A. Mohamed

The thermal stability behavior of Al-5083 cryomilled nanocrystalline powders stabilized by diamantane nanoparticles was studied in comparison with the alloy without diamantane. Nanocrystalline Al 5083 powders were produced by mechanical milling in a liquid nitrogen medium. The results revealed that Al 5083 with diamantane showed higher thermal stability than the cryomilled alloy without diamantane in the temperature limit from 473 °K to 773 °K (0.56 to 0.91Tm) for various annealing times from 0.5 h to 48 h. In this regard, calculations showed that while the grain size was still in the nano scale in the presence of diamantane, it was in the ultrafine range (> 150 nm) in the absence of diamantane. The above finding was qualitatively explained in terms of Zener’s concept.

Nanocrystalline material

Thermal Stability

10.5185/amlett.2019.2282

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Uniformity of composition of alloy whiskers grown from the solid

Scripta Metallurgica (1969)

George Sines Atsuo Nakashima Walid Hanna

10.1016/0036-9748(69)90161-6

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Determinación de la contaminación acústica en el entorno del Aeropuerto Internacional de Ezeiza

Mariano Bonopera Matías A. Chapela Walid Hanna Juan Ignacio D'Iorio Carlos Alejandro Di Bernardi

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Grain size stability in a cryomilled nanocrystalline Al alloy powders containing diamantane nanoparticles

Materials Science and Engineering A (2019)

Walid Hanna Khinlay Maung M.H. Enayati James C. Earthman Farghalli A. Mohamed

Nanocrystalline material

Thermal Stability

10.1016/j.msea.2018.10.006

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Nanocrystalline 6061 Al Powder Fabricated by Cryogenic Milling and Consolidated via High Frequency Induction Heat Sintering

Advances in Materials Science and Engineering (2014)

Walid Hanna Khinlay Maung Ehab A. El‐Danaf Abdulhakim A. Almajid Mahmoud S. Soliman

Nanocrystalline 6061 Al alloy was synthesized by cryogenic milling (cryomilling). Both transmission electron microscopy and X-ray diffraction were used to monitor the change in grain size as a function of milling time. The results of both techniques demonstrated a close agreement with respect to two observations: (a) during cryomilling, the grain size of 6061 Al decreased with milling time, and (b) after 15 h of milling, the grain size approached a minimum value of about 22 nm. Despite this agreement, there was a discrepancy: for grain sizes > 40 nm, the grain size measured by transmission electron microscopy was appreciably larger than that inferred from X-ray diffraction. It was shown that powders consolidated via high frequency induction heat sintering (HFIHS) at 500 and 550°C maintained close to nanoscale grain sized microstructure in addition to high compact density in bulk samples. This was manifested by high strength values as compared to microscale grain samples.

Nanocrystalline material

10.1155/2014/921017

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Citations (6)