محمد شاهمیری
استادیار دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران.
[ 1 ] - افزایش مقاومت به خوردگی موضعی تیتانیم خالص تجاری در محیط اسید سولفوریک با استفاده از روش اکسیداسیون پلاسمای الکترولیتی
پوشش دی اکسید تیتانیم با استفاده از روش اکسیداسیون پلاسمای الکترولیتی در یک مرحله و طی زمان کوتاهی (ده دقیقه) روی سطح تیتانیم خالص تجاری اعمال شده است. در این پژوهش رفتار خوردگی تیتانیم خالص تجاری و نمونه پوشش داده شده با این روش در محیط اسید سولفوریک مورد بررسی قرار گرفته است. ترکیب فازی و ریخت شناسی سطحی پوشش ایجاد شده به ترتیب توسط پراش سنجی پرتوی ایکس[1] و میکروسکوپ الکترونی روبشی[2]مورد بر...
[ 2 ] - DENDRITE FRAGMENTATION IN THE SHEARED MELT BY FATIGUE EROSION MECHANISM OF SEMISOLID Al-Si ALLOY (A.356.0
Over the last few decades, there have been many mechanisms proposed to describe the formation of the non-dendritic microstructures during Semisolid Metal (SSM) processing; including dendrite fragmentation, spherical growth, cellular growth and recalescence. Dendrite fragmentation is the most popular mechanism of all these hypotheses. It is the purpose of the present article to examine the morph...
[ 3 ] - A T.E.M INVESTIGATION OF THE MECHANISM OF EARLY STAGE ORDERING IN THE INTERMETTALIC COMPOUND PT2FECU
Abstract: The microstructural features of the early stage of ordering of the intermetallic compound Pt2FeCu have been examined using optical and transmission electron microscopy in conjunction with X-ray diffraction technique. It was found that the compound has similar morphological alteration to that of FePt in which the ordering cannot be suppressed by rapid quenching. The early stage of ...
[ 4 ] - NEURAL NETWORK MODELING OF THE EFFECT OF COOLING SLOPE CASTING PARAMETERS ON PARTICLE SIZE OF PRIMARY SILICON CRYSTALS OF SEMISOLID CAST INGOTS OF Al-20Si (wt%)
Abstract: Cooling slope-casting processing is a relatively new technique to produce semisolid cast feedstock for the thixoforming process. Simple equipment, ease of operation, and low processing costs are the main advantages of this process in comparison with existing processes such as mechanical stirring, electromagnetic stirring, etc. The processing parameters of cooling slope casting are...
[ 5 ] - اثر بور و زیرکونیوم بر ریزساختار و خواص مکانیکی آلیاژهای ریختگی آلومیناید آهن Fe3Al
In this study, the effects of boron (B) and zirconium (Zr) on the microstructure and mechanical properties of Fe3Al-based alloys were investigated. Cylindrical samples were produced using a vacuum induction melting furnace (VIM); consequently, the melt was cast into a metallic mold. The microstructure, phase identification, tensile and compressive mechanical properties and fractography of the s...
[ 6 ] - The Effects of Gating Systems on the Soundness of Lost Foam Casting (LFC) Process of Al-Si Alloy (A.413.0)
The effects of gating systems, number of runner, and their locations, in the Lost Foam Casting (LFC) of Aluminum alloy (A.413.0) were investigated. Six different gating systems, with one or two running systems were designed. X-ray radiography and the three axis-bending tests have been employed to evaluate the casting soundness and quality. The results revealed that gating systems have a major e...
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