تأثیر افزودن عناصر شبه‌فلزی بور و سیلیسیم بر خواص ساختاری و مغناطیسی آلیاژ آنتروپی بالای AlCoCrMnNi

نویسندگان

دانشگاه صنعتی مالک‌اشتر، دانشکده مهندسی مواد، اصفهان، شاهین‌شهر، ایران، صندوق پستی 15-83145

چکیده

در پژوهش حاضر، تأثیر افزودن عناصر سیلیسیم و بور بر خواص مغناطیسی و ساختاری آلیاژهای آنتروپی بالای پایه AlCoCrMnNi بررسی شده است. خصوصیات ساختاری و مغناطیسی آلیاژهای AlCoCrMnNiX(X=B, Si) توسط میکروسکوپ الکترونی روبشی، دستگاه پراش‌سنج پرتو ایکس، دستگاه گرماسنجی افتراقی و دستگاه مغناطومتر ارتعاشی دنبال شد. ابتدا، عناصر سازنده آلیاژهای AlCoCrMnNiX(X= B, Si) به‌مدت ده ساعت تحت فرایند مخلوط‌سازی قرار گرفتند. نتایج آزمون پراش‌سنجی پرتو ایکس عدم تشکیل محلول جامد در آلیاژهای نام‌ برده را نشان داد. در ادامه، آلیاژها در دمای 900 درجه سانتی‌گراد به‌مدت ده ساعت تحت عملیات آنیل قرار گرفتند. نتایج آزمون پراش‌سنجی پرتو ایکس نشان داد در آلیاژهای AlCoCrMnNi و AlCoCrMnNiB محلول جامد با ساختار مکعبی مرکز پر (BCC) تشکیل شد و در آلیاژهای AlCoCrMnNiSi و AlCoCrMnNiSiB در کنار محلول جامد با ساختار مکعبی مرکز پر (BCC)، ترکیب‌های بین‌فلزی Ni2Si و Cr2Si3 نیز تشکیل شد. ارزیابی مغناطیسی آلیاژها نشان داد با تشکیل محلول جامد در آلیاژ AlCoCrMnNi خواص نرم مغناطیسی بهبود می‌یابد به‌طوری که مغناطش اشباع از 40/22 به emu/g 64/46 و میدان وادارندگی از 181/43 به Oe 14/09 می‌رسد.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Si and B Addition on the Structural and Magnetic Properties of AlCoCrMnNi High Entropy Alloys

نویسندگان [English]

  • Kh. Zamani
  • M. Tavoosi
  • A. Ghasemi
Department of Materials Engineering, Malek-Ashtar University of Technology (MUT), P.O.Box 83145/15, Shahin-Shahr, Isfahan, Iran.
چکیده [English]

In this research, effect of B and Si addition on the structural and magnetic properties of AlCoCrMnNi high-entropy alloys was investigated. The structural and magnetic properties of AlCoCrMnNiX(X= B, Si) alloys were studied by X-ray diffractometer (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). First, the constituent components of the AlCoCrMnNiX (X=B, Si) alloys were mixed for 10 hours. XRD analysis revealed that  the solid solution was not formed by mixing. The alloys were then annealed at 900 ˚C for 10 hours. XRD results revealed formation of a solid solution with BCC structure in AlCoCrMnNi and AlCoCrMnNiB alloys. For AlCoCrMnNiSi and AlCoCrMnNiSiB alloys, Ni2Si and Cr2Si3 intermetallics were formed in addition to the solid solution with BCC structure. VSM results suggested that while forming the solid solution for AlCoCrMnNi alloy, soft magnetic properties improved so that magnetic saturation and coercivity increased from 40.22 to 64.46 emu/g, and from 180.143 to 14.09 Oe, respectively.

کلیدواژه‌ها [English]

  • High entropy alloy
  • AlCoCrMnNiX(X= B
  • Si)
  • mechanical alloying
  • annealing
  • Solid Solution

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مواد پیشرفته در مهندسی
دوره 39، شماره 4
اسفند 1399
صفحه 131-144

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