بررسی تجربی رفتار حرارتی و مکانیکی کامپوزیت واکنشی Al-Niسنتز شده به روش آسیاب مکانیکی

نوع مقاله : علمی و پژوهشی

نویسندگان

1 مهندسی مواد، دانشگاه صنعتی مالک اشتر، تهران، تهران، ایران

2 مجتمع دانشگاهی مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر، تهرا ن، تهران، ایرا ن

چکیده

کامپوزیت‌های واکنشی گروه جدیدی از مواد کامپوزیتی هستند که از دو یا چند ماده فلزی تشکیل شده‌اند؛ به‌طوری‌که در شرایط محیط قادر به اشتعال یا انفجار نیستند ولی در اثر شوک، بارهای ضربه‌ای شدید و افزایش دما، قابلیت آزادسازی انرژی زیادی را دارند. هدف از این تحقیق، بررسی تاثیر تغییر درصد ذرات بر ریزساختار، خواص حرارتی و مکانیکی کامپوزیت Al-Ni است. به این منظور، ترکیب‌ Al-Ni با نسبت‌های مولی 2 به 1، 1 به 1 و 1 به 3 آسیاب و مخلوط شدند. سپس نمونه‌ها پرس سرد شده و در دمای ˚C 400 به مدت یک ساعت تحت اتمسفر گاز خنثی زینتر شدند. ریزساختار به وسیله میکروسکوپ الکترونی روبشی نشر میدانی (FESEM) آنالیز شد. برای بررسی خواص حرارتی و مکانیکی به ترتیب از آزمون‌های DTA و احتراق و فشار و هاپکینسون استفاده شد. در آزمون احتراق بیشترین حرارت آزاد شده مربوط به نمونه با نسبت 1 به 1 بود که علت آن تشکیل فراروده AlNi است. در آزمون فشار و هاپکینسون بیشترین استحکام فشاری مربوط به نمونه با نسبت 1 به 1 و بترتیب MPa 7/208 و 7/309 بود. همچنین نتایج نشان داد با افزایش نرخ کرنش از s-1 01/0 (در آزمون فشار) به s-1 1000 (در آزمون هاپکینسون) استحکام فشاری افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Investigation Thermal and Mechanical Behavior of Ni/Al Reactive Composites Synthesized by Mechanical Alloying

نویسندگان [English]

  • Ali Aliadeh 1
  • mehdi abdollahi 2
1 Assistant Professor, University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran
2 University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran
چکیده [English]

Reactive composites are a new group of composite materials consisting of two or more metal materials that can not ignite or explode in the environment but can release a lot of energy due to shock and severe impact loads. This study aimed to investigate the effect of the ratio of constituent particles on the microstructure and thermal and mechanical properties of the Al-Ni composite. For this purpose, the Al-Ni compound with 2:1, 1:1 and 3:1 molar ratios was milled and mixed. Then the samples were cold pressed and sintered at 400 ˚C under argon atmosphere for one hour. The microstructure of samples was analyzed by microstructure field emission scanning electron microscopy (FESEM) and XRD. For the investigation of thermal and mechanical properties, DTA and ignition tests and compression and Hopkinson tests were used respectively. In the ignition test, due to the AlNi product, the highest value of heat released was related to a sample with 1:1 Al:Ni molar ratio. In the compression and Hopkinson tests, the highest values of compressive strength were 208.7 and 309.7 Mpa respectively, which belong to a 1:1 Al:Ni molar ratio. Also, the results showed that the compressive strength increased by changing the strain rate from 0.01 s-1 (in the pressure test) to 1000 s-1 (in the Hopkinson test).

کلیدواژه‌ها [English]

  • Reactive composites
  • Compressive properties
  • Thermal properties
  • Mechanical alloying

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