M. Tavoosi

[ 1 ] - Preparation and Mechanical Properties of Nano/Ultrafine Bainitic Structure in AISI 52100 Steel

The development of nano/ultrafine bainitic structure in AISI 52100 steel was the goal of this study. For this purpose,the AISI 52100 the specimens were austenitized at 1050 °C for 60 min followed by low-temperature austemperingtreatment at different temperatures and times. The austempered samples were characterized using field emissionscanning electron microscopy (FESEM), X-ra...

[ 2 ] - The Relationship between Structural and Optical Properties of GeO2-PbO Glasses

The structural and optical characterization of bulk GeO2-PbO glasses was the goal of this study. In this regard, six different (100-x)GeO2‌-xPbO (15<x<45) glasses were prepared by conventional melt quenching technique between two steel sheets. The produced samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and UV-Vis s...

[ 3 ] - ساخت و مشخصه‌یابی پنجره‌های مادون‌‌قرمز از جنس شیشه‌ی کالکوژنیدی Ge33As12Se55

ﻫﺪف از اﻧجام اﻳﻦ ﭘﮋوﻫﺶ، ﺑﺮرﺳﻲ ﻣﺸﺨﺼﻪ ﻫﺎی ﻣﺆﺛﺮ در ﺳﺎﺧﺖ ﭘﻨﺠﺮه ﻫﺎی ﻣﺎدون ﻗﺮﻣﺰ از ﺟـﻨﺲ ﺷﻴـﺸﻪ ی ﻛﺎﻟﻜﻮژﻧﻴﺪی Ge33As12Se55ﻣﻲﺑﺎﺷﺪ .در اﻳﻦ راﺑﻄﻪ ﺗﺮﻛﻴﺐ ﺷﻴﺸﻪ ی ﻣﻮرد ﻧﻈـﺮ ﺑـﺎ ﻧـﺴﺒﺖ اﺗﻤـﻲ ﻣﻨﺎﺳـ ﺗﺤﺖ ﺷﺮاﻳﻂ ﻣﺨﺘﻠﻒ در داﺧﻞ ﻛﭙﺴﻮﻟﻪ ﻫﺎی ﻛﻮارﺗﺰ، ذوب و رﻳﺨﺘـﻪﮔـﺮی ﮔﺮدﻳـﺪ . ﻓﺮاﻳﻨـﺪ ذوب در ﻣﺤـﺪوده ی دمایی 750 اﻟﻲ 950 درﺟﻪی ﺳﺎﻧﺘﻲﮔﺮاد ﺑﻪ ﻣﺪت زﻣﺎنﻫﺎی ﻣﺨﺘﻠﻒ اﻧﺠﺎم و ﺳﺮﻣﺎﻳﺶ ﻣﺬاب در ﻣﺤـﻴﻂﻫـﺎی ﺧﻨﻚ ﻛﻨﻨﺪه ی ﻣﺘﻔﺎوت ﺻﻮرت ﭘﺬﻳﺮﻓﺖ .ﺑﺮر...

[ 4 ] - تشکیل ترکیب بین‌فلزی Al3Ti در فصل مشترک اتصال زوج نفوذی آلومینیوم- تیتانیم از طریق انجام عملیات حرارتی نفوذی

In this study, the formation of the Al3Ti intermetallic compound at the junction interface of aluminum-titanium was investigated during deposition and annealing. The results illustrated that during the deposition process, one thin layer of Ti3Al2 intermetallic compound was created at the junction interface. During the annealing at 550 °C, this layer was transformed to the  Al3Ti interm...

[ 5 ] - عملکرد تقویت کننده‌های کامپوزیتی Al2O3-TiB2/Fe در کامپوزیت‌های زمینه آلومینیم

Investigating the effect of Al2O3-TiB2/Fe complex reinforcement (CCMR) on the mechanical properties of aluminum composites was the goal of this study. For this purpose, the Al2O3-TiB2/Fe reinforcement powders were synthesized during milling and subsequent annealing. Different volume percentages of the produced reinforcement powders (1.25, 2.5 and 5 vol.%) were added to aluminum matrix, mil...

[ 6 ] - THE KINETIC AND MECHANISM OF CRYSTALLIZATION OF MGGEO3 IN 65GEO2-15PBO-10MGF2-10MGO GLASS SYSTEM

In this study, the crystallization behavior of a 65GeO2-15PbO-10MgF2-10MgO glass (prepared by the conventional melt quenching technique) has been investigated. The microstructure and crystallization behaviors of this glass were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), non-isothermal differential thermal analysis (DTA) and Fourier transform infrared spectr...

[ 7 ] - مقایسه‌ی رفتار خوردگی پوشش‌های کامپوزیتی Fe-Ni-Cr تقویت شده توسط نانوذرات کاربید سیلیسیم و نانولوله‌های کربنی

هدف از این پژوهش بررسی رفتار خوردگی پوشش‌های کامپوزیتی Fe-Ni-Cr تقویت شده توسط نانوذرات کاربید سیلیسیم و نانولوله‌های کربنی می‌باشد. در این راستا و به منظور ایجاد پوشش‌های مورد نظر، فرایند رسوب‌دهی الکتریکی در یک حمام کلریدی، در حضور و عدم حضور تقویت کننده‌های کاربید سیلیسیم و نانولوله‌های کربنی انجام شد. بررسی‌های‌ ریزساختاری توسط پراش‌سنجی پرتوایکس (XRD) و میکروسکپ‌ الکترونی روبشی گسیل میدانی...

[ 8 ] - بررسی خواص اپتیکی شیشه‌های سیستم GeO2-PbO-CaO-SrO در حضور مقادیر مختلف از اکسیدهای کلسیم و استرانسیم

In the present study, the structural, optical and thermal behaviors of GeO2-PbO-CaO-SrO glasses were investigated to achieve the highest optical properties and thermal stability. Accordingly, different 50GeO2-(50-x)PbO-xCaO and 50GeO2-(50-x)PbO-xSrO (x=0, 10, 20) germanate glasses were prepared by the conventional melt and quench technique between two steel sheets. The produced samples were cha...

[ 9 ] - Development of Ultrafine Bainitic Structure in AISI 431 Stainless Steel

The development of ultrafine bainitic structure in AISI 431 stainless steel was the goal of this study. For this purpose, the AISI 431 specimens were austenitized at 1100 °C for 60 min followed by low-temperature austempering treatment at different temperatures and times. Austempered samples were characterized using field emission scanning electron microscopy (FESEM), X-ray diffraction (X...

[ 10 ] - Fabrication and Structural Characterization of Se-Ge Chalcogenide Glasses by Means of Melt Quenching Technique

The structural and optical characterization of Se-Ge alloys during melt quenching technique was the goal of this study. In this regards, five different samples of Se100-xGex (x= 10, 20, 30, 40, 50) were prepared by conventional melt quenching in quartz ampoule. The produced samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calori...

[ 11 ] - Development of Al-Ti-N Composite Coatings on Commercially Pure Ti Surface by Tungsten Inert Gas Process

The present work aims to modify surface properties of pure Ti by development of Ti-Al-N intermetallic composite coatings. In this regard, tungsten inert gas (TIG) cladding process was carried out using Al 1100 as filler rod with Ar and Ar+N2 as shielding gases. Phase and structure of the samples were investigated by X-ray diffraction (XRD) technique, optical microscopy (OM) and scanning electro...

[ 12 ] - COMPARISON OF MICROSTRUCTURE AND PHASE EVOLUTION OF YSZ NANOPARTICLES SYNTHESIZED BY CO-PRECIPITATION AND MOLTEN SALT METHODS

This study aimed to compare the phase changes and morphology of yttria-stabilized zirconium oxide powders (YSZ) synthesized by co-precipitation and molten salt methods. Ammonia precipitating agent was used for the synthesis of YSZ powder by co-precipitation method and a mixture of sodium carbonate and potassium carbonate salts was used as a molten salt in the molten salt method. Samples were ch...

[ 13 ] - The Influence of Heat-Input on Structural and Mechanical Properties of 2205 Duplex Stainless Steel

The influence of heat-input and pre-heat treatment on the structure, mechanical and corrosion behaviors of 2205 duplex stainless steel joint by means of GMAW process was the goal of this study. In this regards, the welding process was done using different heat input in the range of 0.6 to 1.4 kJ/mm and different pre-heating treatments in the range of 25 to 100 oC. The microstructural properties...

[ 14 ] - The Influence of Heat-Input on Structural and Mechanical Properties of 2205 Duplex Stainless Steel

The influence of heat-input and pre-heat treatment on the structure, mechanical and corrosion behaviors of 2205 duplex stainless steel joint by means of GMAW process was the goal of this study. In this regards, the welding process was done using different heat input in the range of 0.6 to 1.4 kJ/mm and different pre-heating treatments in the range of 25 to 100 oC. The microstructural properties...