امکان سنجی تولید پوشش آلیاژی آنتروپی بالای CoCrFeMnNi به روش رسوب الکتروشیمیایی و مشخصه‌یابی آن

نوع مقاله : علمی و پژوهشی

نویسندگان

صنعتی اصفهان

چکیده

آلیاژ­های آنتروپی بالا (HEA) به‌طورمعمول به‌عنوان آلیاژ­های محلول ­جامد حاوی بیش از پنج عنصر اصلی با درصد اتمی تقریباً یکسان تعریف‌شده‌اند. آلیاژ­های آنتروپی بالا­در دو نوع بالک و پوشش تولید می‌شود. اغلب این آلیاژ‌­ها به‌صورت بالک بوده­و تحقیقات کمتری بر روی تولید آن‌ها به‌صورت پوشش انجام‌گرفته است. یکی از روش‌­های کمتر استفاده­شده، روش رسوب الکتروشیمیایی است. در تحقیق حاضر آلیاژ آنتروپی بالای CoCrFeMnNi به روش رسوب الکتروشیمیایی با پتانسیل ثابت در حمام کلریدی با حلال DMF-CH3CN تولید شد. اثر اعمال پتانسیل ثابت در مقادیر 1 تا 6 ولت بر روی تشکیل آلیاژ آنتروپی بالا، ساختار، ترکیب و مورفولوژی موردبررسی قرار گرفت. مورفولوژی، ترکیب شیمیایی و ساختار میکروسکوپی نمونه­های حاصل به ترتیب به‌وسیله میکروسکوپ الکترونی روبشی (SEM)، طیف‌سنج انرژی (EDS) و پراش پرتوایکس  لایه‌نازک (GXRD) شناسایی شد. نتایج نشان داد که امکان پوشش دهی این آلیاژ 5 جزئی در پتانسیل کمتر از 4 ولت وجود ندارد. همچنین نتایج حاصل از آنالیز EDS نشان داد که تغییر در پتانسیل پوشش دهی از 4 تا 6 ولت باعث تغییر در ترکیب شیمیایی شده است. نکته حائز اهمیت آن‌که در تمامی حالت­های پوشش حاصل در پتانسیل‌های 4، 5 و 6 ولت، آنتروپی اختلاط بیشتر از JK-1mol-1 12، در محدوده تشکیل آلیاژ آنتروپی بالا، بوده است. نتایج حاصل از آنالیز GXRD، نیز تشکیل ساختار محلول جامد با شبکه FCC را اثبات نمود. تأثیر پتانسیل پوشش دهی بر مورفولوژی پوشش نیز با استفاده از SEM انجام پذیرفت. نتایج نشان داد مورفولوژی پوشش به‌صورت سطحی صاف، بدون ترک و فشرده بوده است. 

کلیدواژه‌ها


عنوان مقاله [English]

The Feasibility of Producing CoCrFeMnNi High Entropy Alloy Coatings by Electrochemical Deposition Method and Its Characterization

نویسندگان [English]

  • Fateme yoosefan
  • Ali Ashrafi
  • Sayed Mahmoud Monir Vaghefi
Isfahan University of Technology
چکیده [English]

High entropy alloys (HEAs) are commonly defined as alloys composed of 5 or more alloying elements and several particular HEA systems have the ability to form a mono-phase solid solution structure. Altogether there are many high entropy alloys with unique properties. The production of high entropy alloys has been carried out in two types of bulk and coatings; HEAs are usually prepared by physical methods that used for obtaining bulk materials. HEA coatings have been produced by various deposition methods. Electrochemical deposition is a low-cost alternative for the synthesis of high entropy alloy thin films, and less research has been done on this method. In the present study, CoCrFeMnNi high entropy alloy was produced by potentiostatic electrochemical deposition in a chlorine bath with DMF-CH3CN solvent. The effect of applying constant potentials at values ​​of 1, 2, 3, 4, 5 and 6 volts on the formation of a high entropy alloy with a solid solution structure FCC, composition and morphology was investigated. Microstructure and chemical composition are determined by X-ray diffraction for thin films (GXRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) are used to investigate the corrosion behavior. The results of the EDS analysis showed that the chemical composition changed with the change of each electrodeposition parameters, but in all states, the entropy of mixing around 12 JK-1mol-1 that was in the range of formation of high entropy alloys. The results of the GXRD analysis proved the formation of a solid solution structure with the simple FCC phase. Coating morphology in a constant potential coating was flat, non-cracked and compact.

کلیدواژه‌ها [English]

  • High entropy alloys
  • Solid solution
  • Electrochemical electrodeposition
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