سنتز پودرآلیاژ حافظه‌دار Cu-12Al-4Ni حاوی بور به روش آلیاژسازی مکانیکی و بررسی تغییرات چگالی و تخلخل نمونه بالک در حین تولید

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ التحصیل دانشگاه تهران

2 دانشکده مهندسی متالورژی و مواد پردیس دانشکده‌های فنی دانشگاه تهران

3 استادیار دانشگاه صنعتی همدان

چکیده

در این پژوهش پودر آلیاژ حافظه‌دار Cu-12wt%Al-4wt%Ni با عنصر آلیاژی بور و بدون آن به روش آلیاژسازی مکانیکی تهیه و سپس پودر حاصل به روش پرس-سینتر و متعاقب آن نورد-عملیات حرارتی تبدیل به نمونه بالک شد وچگالی و مقدار تخلخل نمونه ها مورد بررسی قرار گرفت. در این راستا، تأثیر زمان آسیاکاری بر روی تغییرات فازی، اندازه کریستالیت و کرنش شبکه‌ای مطالعه گردید. نتایج نشان داد که بعد از 20 ساعت آسیاکاری با سرعت 250 دور بر دقیقه و نسبت وزنی گلوله به پودر 20:1، پیک‌های مربوط به عناصر خالص از بین رفته و محلول جامدی با ساختار FCC و پارامتر شبکه‌ای بسیار نزدیک به پارامتر شبکه مس تولید می‌شود. ریزساختار و مورفولوژی پودرهای آسیاکاری شده و نمونه‌ی نهایی توسط میکروسکوپ الکترونی و نوری مورد مطالعه قرار گرفتند. مشاهده گردید که افزودن بور باعـث ریز شدن ذرات پس از آسیاکاری می گردد. نتایج نشان دادند که با افزایش زمان آسیاکاری، چگالی خام قطعه پس از پرس- سینتر کاهش ولی چگالی نهایی پس از نورد-عملیات حرارتی افزایش پیدا می کند. همچنین نشان داده شد که افزودن بور به مخلوط پودری موجب توزیع یکنواخت‌تر تخلخل ها پس از مرحله نورد- عملیات حرارتی می گردد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis of Boron Containing Cu-12Al-4Ni Memory Alloy powder by Using Mechanical Alloying Method and Investigating the Changes of the Density and Porosity in Bulk Samples During production

نویسنده [English]

  • Shahram Raygan 2
1
2 Tehran University
3
چکیده [English]

In this research Cu-12wt%Al-4wt%Ni shape memory alloy powder with and without addition of boron as alloying element was produced by using mechanical alloying method. Bulk samples were produced from the powder by press-sinter and subsequently rolling-heat treatment processes. The density and the amount of porosity of the samples were measured, subsequently. The effect of milling time on phase changes in produced powder, size of crystallites and lattice strain was also investigated. Results showed that after 20h of milling with rotating speed of 250 rpm and ball to powder mass ratio of 20:1, peaks of pure elements disappear and solid solution with FCC structure and lattice parameter close to that of copper forms. Morphology of milled powder and microstructure of bulk samples were studied by optical microscope and scanning electro-microscope. It was observed that adding boron lead to decrease in the size of particles after milling. Results showed that the density of samples after press-sinter processes decreases. However, the final density increased after rolling-heat treatment processes. It was also shown that adding boron to the powder mixture results in more homogenous distribution of porosities after rolling-heat treatment processes.

کلیدواژه‌ها [English]

  • Synthesis
  • Mechanical alloying
  • Shape memory alloy
  • Cu-12Al-4Ni
  • Boron

مراجع

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  • تاریخ دریافت: 09 مهر 1395
  • تاریخ بازنگری: 01 تیر 1396
  • تاریخ پذیرش: 01 تیر 1396

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