علوم و فناوری کامپوزیت

بررسی رفتار مکانیکی و ریزساختار کامپوزیت آلومینیوم- الیاف بازالت ساخته شده به روش اختلاط جریان برشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مهندسی و علم مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران.

2 استاد، مهندسی و علم مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران.

چکیده

ساخت کامپوزیت های زمینه فلزی تقویت شده با الیاف یکی از چالش های بزرگ مهندسی در صنایع مختلف به دلیل محدودیت های تولید آن می باشد. در این پژوهش سعی شده است تا با استفاده از روش اختلاط جریان برشی به عنوان روشی جدید در حالت نیمه جامد و با کمک نیروی برشی در فرآیند تولید کامپوزیت زمینه آلومینیوم تقویت شده با الیاف استفاده شود. بدین منظور الیاف بازالت (با درصدهای حجمی 2، 4 و 6) در مذاب آلومینیوم A356 توزیع شده و با ایجاد جریان برشی در محدوده دمای نیمه جامد آلومینیوم، نمونه های کامپوزیتی ساخته شدند. جهت بررسی رفتار مکانیکی کامپوزیت ها از آزمون سختی برینل و پانچ برشی استفاده شد. همچنین بررسی های ریزساختاری به همراه آنالیز عنصری توسط میکروسکوب الکترونی روبشی انجام شد. نتایج بدست آمده نشان داد که با افزایش درصد الیاف بازالت به طور هم زمان سختی، استحکام برشی و استحکام کششی بهبود یافته و در نهایت باعث بهبود استحکام نهایی کامپوزیت گردیده است. استحکام برشی از 119.1 مگاپاسکال برای نمونه بدون الیاف به 132.3 مگاپاسکال در کامپوزیت تقویت شده با 6 درصد حجمی الیاف بازالت افزایش یافت. همچنین نتایج آزمون سختی، افزایش سختی از 62.3 به 70.8 برینل را در نمونه حاوی 6 درصد حجمی الیاف بازالت نشان داد. استحکام کششی نهایی در این نمونه نیز بهبود 10.9 درصدی را نشان داد. بررسی های میکروساختاری نشان داد که تشکیل ترکیبات بین‌فلزی در فصل مشترک باعث بهبود خواص مکانیکی در این کامپوزیت شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the mechanical behavior and microstructure of basalt fibers-aluminum composite fabricated by thixomixing method

نویسندگان [English]

  • Mohammad Kangooie 1
  • Reza Eslami-Farsani 2

1 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

2 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

چکیده [English]

Fabricating Metal matrix composites (MMCs) reinforced by fibers is one of the biggest issues in the engineering in various industries, due to having production limitations. In this research has been tried to fabricate aluminum matrix composites reinforced by fibers through thixomixing as novel method in semi-solid state and by helping shear force. For doing this, the basalt fibers (with the volume fraction of 2, 4, and 6) were dispersed into the molten A356 aluminum and by creating the shear mixing in the range of semi-solid temperature of aluminum, the composites were fabricated. For investigating the mechanical behavior of fabricated composites, the Brinell hardness and shear punch tests were used. Also, microstructural investigations and elemental analysis by scanning electron microscope were performed. The obtained results showed that by increasing the fibers content, the hardness and shear strength were simultaneously improved, which resulted to improve the ultimate strength of composite. The shear strength from 119.1 MPa (for without fibers sample) to 132.3 MPa (in reinforced composite by 6 vol.% basalt fibers) was increased. Also, the hardness test results showed an increase in Brinell hardness from 62.3 to 70.8 Hb in the sample with 6 vol.% of basalt fibers. The ultimate tensile strength in this sample also showed the 10.9% improvement. Microstructural investigations depicted that the formation of intermetallic compounds at the interface caused to improve the mechanical properties.

کلیدواژه‌ها [English]

  • Metal Matrix Composite
  • Shear Mixing
  • Mechanical Properties
  • Hardness Behavior
  • Basalt Fibers
مراجع
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علوم و فناوری کامپوزیت
دوره 10، شماره 1
خرداد 1402
صفحه 2184-2192
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