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Corrosion evaluation of friction stir welded lap joints of AA6061-T6 aluminum alloy

Transactions of Nonferrous Metals Society of China 2016年第3期26卷 684-696页

作者： Farhad GHARAVI khamirul a.matori Robiah YUNUS Norinsan K.OTHMAN Firouz FADAEIFARD Materials Synthesis and Characterization Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Physics Faculty of Science Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Schools of Applied Physics Faculty of Science and Technology University Kebangsaan Malaysia43600 UPM BangiSelangorMalaysia

Corrosion behavior of friction stir lap welded AA6061-T6 aluminum alloy was investigated by immersion tests in sodium chloride + hydrogen peroxide solution. Electrochemical measurement by cyclic potentiodynamic polarization, scanning electron microscopy, and energy dispersive spectroscopy were employed to characterize corrosion morphology and to realize corrosion mechanism of weld regions as opposed to the parent alloy. The microstructure and shear strength of welded joint were fully investigated. The results indicate that, compared with the parent alloy, the weld regions are susceptible to intergranular and pitting attacks in the test solution during immersion time. The obtained results of lap shear testing disclose that tensile shear strength of the welds is 128 MPa which is more than 60% of the strength of parent alloy in lap shear testing. Electrochemical results show that the protection potentials of the WNZ and HAZ regions are more negative than the pitting potential. This means that the WNZ and HAZ regions do not show more tendencies to pitting corrosion. Corrosion resistance of parent alloy is higher than that for the weldments, and the lowest corrosion resistance is related to the heat affected zone. The pitting attacks originate from the edge of intermetallic particles as the cathode compared with the Al matrix due to their high self-corrosion potential. It is supposed that by increasing intermetallic particle distributed throughout the matrix of weld regions, the galvanic corrosion couples are increased, and hence decrease the corrosion resistance of weld regions.

关键词： friction stir welding lap joints AA6061 alloy pitting corrosion welding process intermetallic particles

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Effect of post weld heat treatment on microstructure and mechanical properties of gas tungsten arc welded AA6061-T6 alloy

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Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3102-3114页

作者： Firouz FADAEIFARD khamirul Amin matori Farhad GARAVI Muath Al-FALAHI Gholamreza Vahedi SARRIGANI Materials Synthesis and Characterization Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia Department of Physics Faculty of ScienceUniversiti Putra Malaysia

Double-V butt TIG welding process was performed on two plates of AA6061-T6 using ER5356 filler. The microstructure,mechanical and nanomechanical properties of the joint were evaluated in as-welded and after post weld heat treatment (PWHT) usingXRD, FESEM, EBSD, nanoindentation and tensile tests. The results show that PWHT led to microstructural recovery of the heataffected zone (HAZ) in addition to the appearance of β-phase (Al3Mg2) at the grain boundaries of weld zone. The hardness (Hnano) inall zones increased after PWHT while the elastic modulus (Enano) was improved from 69.93 GPa to 81 GPa in weld area. All resultsindicate that PWHT has created a homogenous microstructure in the weld zone in addition to outstanding improvement inmechanical properties for the weld zone which surpass the base metal.

关键词： AA6061-T6 alloy ER5356 gas tungsten arc welding post weld heat treatment nanoindentation microstructure

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Process−microstructure−properties relationship in Al−CNTs−Al2O3 nanocomposites manufactured by hybrid powder metallurgy and microwave sintering process

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2339-2354页

作者： Meysam TOOZANDEHJANI Farhad OSTOVAN Khairur Rijal JAMALUDIN Astuty AMRIN khamirul Amin matori Ehsan SHAFIEI Razak Faculty of Technology and Informatics Universiti Teknologi Malaysia Kuala Lumpur54100 Jalan SemarakKuala LumpurMalaysia Department of Material Science and Engineering Islamic Azad UniversityBandar Abbas BranchBandar AbbasHormozganIran Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400SerdangSelangorMalaysia

Al−2CNTs−xAl2O3 nanocomposites were manufactured by a hybrid powder metallurgy and microwave sintering *** correlation between process-induced microstructural features and the material properties including physical and mechanical properties as well as ultrasonic parameters was *** was found that physical properties including densification and physical dimensional changes were closely associated with the morphology and particle size of nanocomposite *** maximum density was obtained by extensive particle refinement at milling time longer than 8 h and Al2O3 content of 10 wt.%.Mechanical properties were controlled by Al2O3 content,dispersion of nano reinforcements and grain *** optimum hardness and strength properties were achieved through incorporation of 10 wt.%Al2O3 and homogenous dispersion of CNTs and Al2O3 nanoparticles(NPs)at 12 h of milling which resulted in the formation of high density of dislocations and extensive grain size *** both longitudinal and shear velocities and attenuation increase linearly by increasing Al2O3 content and milling *** variation of ultrasonic velocity and attenuation was attributed to the degree of dispersion of CNTs and Al2O3 and also less inter-particle spacing in the *** larger Al2O3 content and more homogenous dispersion of CNTs and Al2O3 NPs at longer milling time exerted higher velocity and attenuation of ultrasonic wave.

关键词： hybrid composite aluminum composites powder metallurgy microwave sintering microstructure mechanical properties ultrasonic velocity ultrasonic attenuation

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Elastic Moduli of Zinc Oxyfluorotellurite Glasses

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材料科学与工程（中英文版） 2011年第3期5卷 319-322页

作者： Sidek Haji Ab Aziz Rosmawati Sharuddin khamirul Amin matori Halimah Mohamed Kamari Department of Physics Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

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Influence of rotational speed on mechanical properties of friction stir lap welded 6061-T6 Al alloy

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Transactions of Nonferrous Metals Society of China 2014年第4期24卷 1004-1011页

作者： Firouz FADAEIFARD khamirul Amin matori Meysam TOOZANDEHJANI Abdul Razak DAUD Mohd Khairol Anuar Mohd ARIFFIN Norinsan Kamil OTHMAN Farhad GHARAVI Abdul Hadi RAMZANI Farhad OSTOVAN Materials Synthesis and Characterization Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia Department of Physics Faculty of Science Universiti Putra Malaysia Department of Mechanical and Manufacturing Faculty of Engineering Universiti Putra Malaysia School of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia

The effect of rotational speed on macro and microstructures, hardness, lap shear performance and failure mode of friction stir lap welding on AA6061-T6 Al alloy with 5 mm in thickness was studied by field-emission scanning electron microscopy （FE-SEM）. The results represent much closer hardness distribution in the upper and lower plates at the lowest rotational speed. It indicates the Fe-compounds in the fracture surface of the nugget zone by EDX.

关键词： aluminum alloy friction stir lap welding mechanical properties

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Sub-pixel analysis to enhance the accuracy of evapotranspiration determined using MODIS images

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International Journal of Agricultural and Biological Engineering 2017年第2期10卷 103-113页

作者： Abdalhaleem A.Hassaballa Abdul-Nasir matori Khalid A.Al-Gaadi Elkamil H.Tola Rangaswamy Madugundu Precision Agriculture Research Chair(PARC) King Saud UniversityRiyadh 11451Saudi Arabia Geoinformatics Cluster Department of Civil EngineeringUniversiti Tecknologi PETRONASTronoh 31750Malaysia Department of Agricultural Engineering College of Food and Agriculture SciencesKing Saud UniversityRiyadh 11451Saudi Arabia

A study was carried out to estimate the actual evapotranspiration(ET)over a 1074 km2 of the humid area of Perak State(Malaysia),where water and evaporation cycle deeply influences the climate,natural resources and human living *** from both Terra and Aqua platforms of the Moderate Resolution Imaging Spectroradiometer(MODIS)sensor were used for ET estimation by employing the Surface Energy Balance Algorithm for Land(SEBAL)*** a part of the accuracy assessment process,in-situ measurements on soil temperature and reference ET(ET0)were recorded at the time of satellite *** order to enhance the accuracy of the generated ET maps,MODIS images were subjected to sub-pixel analysis by assigning weights for different land surface cover(urban,agriculture and multi-surface areas)*** weighting process was achieved by integrating ET from pure pixels with the respective site-specific ET0 of each land *** enhanced SEBAL model estimated ET exhibited a good correlation with the in-situ measured Penman-Montieth ET0,with R2 values for the Aqua and the Terra platforms of 0.67 and 0.73,***,the correlation of the non-enhanced ET maps resulted in R2 values of 0.61 and 0.68 for the Aqua and the Terra platforms,***,the results of this study revealed the feasibility of employing the sub-pixel analysis method for an accurate estimation of ET over large areas.

关键词： evapotranspiration sub-pixel analysis MODIS image MODIS sensor remote sensing land surface cover

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