خواص مکانیکی و خوردگی نانو کامپوزیت مس-اکسید گرافن حاوی 2% اکسید گرافن تولید شده به روش فرآیند اتصال نورد تجمعی (ARB)

فصلنامه علمی - پژوهشی مواد نوین

مقاله 4، دوره 11، شماره 39، اردیبهشت 1399، صفحه 43-60   

نوع مقاله: مقاله پژوهشی

نویسندگان

لاله قلندری^* ؛ پریسا تاج بخش

گروه مهندسی مواد، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

تاریخ دریافت: 01 آبان 1398،  تاریخ بازنگری: 28 اسفند 1398،  تاریخ پذیرش: 09 اردیبهشت 1399 

چکیده

در این پژوهش برای اولین بار، ورق­های کامپوزیت Cu/Go حاوی %2 اکسید گرافن در چهار مرحله با استفاده از فرایند اتصال نورد تجمعی، در دمای محیط در شرایط بدون روانکار و از طریق اعمال کرنش پلاستیک شدید به منظور دستیابی به ساختار­های با دانه­های فوق ریز و نانومتری ساخته شد. به این منظور از مس خالص تجاری و اکسید گرافن استفاده گردید. تغییرات خواص مکانیکی و ریز ساختاری، قبل و بعد از انجام فرایند اتصال نورد تجمعی در چرخه­های مختلف تولید، مورد بررسی و مقایسه قرار گرفت. هم چنین، رفتار خوردگی و هدایت الکتریکی کامپوزیت در مراحل مختلف فرایند با یکدیگر، مقایسه شدند. به منظور بررسی خواص مکانیکی کامپوزیت تولید شده، آزمون­های کشش و میکرو سختی و شکست نگاری قبل از انجام فرایند و در چرخه­های مختلف فرایند انجام شد. برای مشاهده­ تغییرات ساختار با افزایش تعداد مراحل فرایند، از میکروسکوپ الکترونی گسیل میدانی (FESEM) مجهز به طیف سنج EDX استفاده شد. مشاهده ریز ساختار نشان داد که در مرحله­های پایین­تر پودر اکسید گرافن به صورت توده­ای و در مراحل نهایی به صورت یکنواخت­تر توزیع شده است. مشاهده­ تصاویر میکروسکوپی الکترونی گسیل میدانی از سطوح شکست در نمونه­های آزمون کشش نیز، بیانگر آن بود که شکست به صورت نرم می­باشد و عمق دیمپل­ها با افزایش چرخه­های فرایند کاهش می­یابد. مقاومت به خوردگی و هدایت الکتریکی کامپوزیت تولید شده نسبت به مس خالص افزایش یافت.

کلیدواژه‌ها

اتصال نورد تجمعی؛ کامپوزیت مس/اکسید گرافن؛ کرنش پلاستیک شدید؛ FESEM؛ خوردگی

عنوان مقاله [English]

Mechanical and Corrosion Properties of Graphene Oxide-Copper Nano-composites produced by the accumulative Roll Bonding (ARB) method

نویسندگان [English]

Laleh Ghalandari؛ Parisa Tajbakhsh

Department of Materials Science and Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

چکیده [English]

The Copper/Graphene oxide composite sheets, containing 2% graphene oxide were made by accumulative roll bonding method in four steps for the first time. The process was performed at ambient temperature and non-lubricating conditions. The initial materials were commercial pure copper and graphene oxide.
In order to evaluation the produced composites the mechanical, microstructural, electrical and corrosion behavior of the produced composites were investigated at different ARB cycles.
The mechanical properties of the composite were investigated by tensile, micro hardness and fractography tests before and at different stages of the process.
To observe structural changes a field emission scanning electron microscopy (FESEM) equipped with an EDX spectrometer were used.
The results have shown that no new phase has been produced in this composite, and only the main peak of the copper, graphene and oxygen elements could be observed in the EDX patterns.The observation of microstructure showed that in lower cycles, graphene oxide powders were more agglomerated and had non-uniform distribution and in the final stages the powders distribution was more uniformly.
The fractography results revealed ductile fracture of the produced composites.
The corrosion resistance and electrical conductivity of composites increased compared to pure copper

کلیدواژه‌ها [English]

accumulative roll bonding, copper / graphene oxide composites, ultra-fine grain microstructure, mechanical properties, corrosion behavior

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