خواص مکانیکی و خوردگی نانو کامپوزیت مس-اکسید گرافن حاوی 2% اکسید گرافن تولید شده به روش فرآیند اتصال نورد تجمعی (ARB)
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
لاله قلندری
1
(گروه مهندسی مواد، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران)
پریسا تاج بخش
2
(گروه مهندسی مواد، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران)
کلید واژه: خوردگی, اتصال نورد تجمعی, کامپوزیت مس/اکسید گرافن, کرنش پلاستیک شدید, FESEM,
چکیده مقاله :
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.
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
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