تاثیر درصد Al2O3 بر خواص مکانیکی فوم کامپوزیتی Al-(0-40%)Al2O3 تولید شده به‌روش آلیاژسازی مکانیکی کم انرژی

نویسندگان

گروه پژوهشی فلزات، پژوهشکده مهندسی مواد، دانشگاه تحصیلات تکمیلی صنعتی و فنآوری پیشرفته کرمان

چکیده

در این پژوهش، ابتدا پودرهای کامپوزیتی Al-Al2O3 با مقادیر مختلف 0، 10، 20، 30 و 40 درصد حجمی Al2O3 به‌روش آلیاژسازی مکانیکی در یک آسیاب کم انرژی تهیه و به‌عنوان ماده فوم، مورد استفاده قرار گرفتند. سپس با استفاده از روش فضاساز و بهره‌گیری از ذرات کربامید کروی با قطر 1تا 4/1 میلی‌متر (بعنوان عامل فضاساز)، فوم‌های کامپوزیتی شامل 50، 60 و 70 درصد تخلخل تهیه شدند. برای بررسی خواص فشاری فوم-های تولیدی، از آزمون فشار تک محوری با نرخ کرنش 1-S 3-10 استفاده شد. نتایج نشان داد خواص فشاری فوم‌ها متأثر از کسر حجمی Al2O3 و درصد تخلخل است به‌گونه‌ای که با کاهش درصد تخلخل، خواص فشاری بهبود می‌یابد. همچنین فوم‌های ساخته شده با 10 درصد حجمی Al2O3 در این پژوهش، بهترین خواص فشاری را دارا بودند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Al2O3 Particles on Mechanical Properties of Al-(0-40%)Al2O3 Composite Foams Produced by Low Energy Mechanical Alloying

نویسندگان [English]

  • M. Alizadeh
  • M. Mirzaei
چکیده [English]

In this study, at first Al-Al2O3 composite powders having different volume fractions of Al2O3 (0, 10, 20, 30 and 40 vol.%) were produced by low energy mechanical alloying, which were used as foam materials. Then, composite foams with 50, 60, and 70 percent of porosity were produced by space-holder technique. Spherical carbamide particles (1-1.4 mm) were used to achieve spherical porosities. In order to investigate the compressive behavior of foams, the compression test with strain rate of 10-3 S-1 was performed on the foam samples. The results showed that the compressive properties depended on the volume fraction of Al2O3 and porosity fraction. Generally, by decreasing the porosity fraction, the compressive properties were improved. The composite foams containing 10 vol.% Al2O3 showed superior compressive properties in comparison to other foams studied in this work.

کلیدواژه‌ها [English]

  • mechanical alloying
  • Low energy milling
  • Space holder
  • Carbamide
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