نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، مهندسی مواد، دانشگاه مالک اشتر، تهران.

2 فارغ‌التحصیل کارشناسی ارشد، مهندسی مواد مرکب، دانشگاه مالک اشتر، تهران.

3 دانشجوی دکتری، مهندسی مواد مرکب، دانشگاه مالک اشتر، تهران.

10.22068/jstc.2022.551087.1777

چکیده

کامپوزیت‌های واکنشی گروه جدیدی از مواد کامپوزیتی که متشکل از دو یا چند ماده هستند؛ به‌طوری‌که در شرایط محیطی قادر به اشتعال یا انفجار نیستند ولی در اثر شوک و بارهای ضربه‌ای شدید و افزایش دما، قابلیت آزادسازی انرژی زیادی را دارند. هدف در این تحقیق، بررسی اثر مدت زمان آسیاکاری بر ریزساختار و خواص حرارتی و خواص مکانیکی کامپوزیت Al-Ni است. به این منظور، ترکیب‌ Al-Ni با نسبت مولی 2:1 در 0.5، 1، 2، 4 و 6 ساعت آسیاکاری و مخلوط شدند. سپس نمونه‌ها پرس سرد شده و در دمای ˚C 400 به مدت یک ساعت تحت اتمسفر گاز خنثی تف‌جوشی شدند. ریزساختار به وسیله میکروسکوپ الکترونی روبشی نشر میدانی (FESEM) و XRDآنالیز شد. برای بررسی خواص حرارتی از DSC و DTA و برای خواص مکانیکی از آزمون فشار و هاپکینسون استفاده شده است. نتایج آزمون DSC نشان داد که با افزایش زمان آسیاکاری دمای شروع واکنش از ˚C 650.34 در نمونه 0.5 ساعت آسیاکاری شده به ˚C 645.84 در نمونه 6 ساعت آسیاکاری شده و گرمای واکنش (آنتالپی) از J/g 26.87 به J/g 14.84 کاهش پیدا کرد. نتایج آزمون فشار و هاپکینسون برای نمونه با 6 ساعت آسیاکاری به ترتیب افزایش 21 و 42 درصدی استحکام فشاری را در مقایسه با نمونه با 0.5 ساعت آسیاکاری نشان داد. همچنین نتایج نشان داد با افزایش نرخ کرنش از s-1 0.01 (در آزمون فشار) به s-1 1000 (در آزمون هاپکینسون) تنش فشاری افزایش می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

The role of mechanical alloying time on the thermal and mechanical behavior of Al/Ni reactive composites

نویسندگان [English]

  • Ali Alizadeh 1
  • Mohammad Estakhri 2
  • Mohammadreza Zahmatkesh 2
  • Mehdi Mehdi Abdollahi Azghan 3

1 Complex of Material and Manufacturing Technology, Malek Ashtar University, Tehran, Iran.

2 Complex of Material and Manufacturing Technology, Malek Ashtar University, Tehran, Iran.

3 Complex of Material and Manufacturing Technology, Malek Ashtar University, Tehran, Iran.

چکیده [English]

Reactive composites are a new group of composite materials consisting of two or more materials that cannot ignite or explode in the Environmental conditions, but can release a lot of energy due to shock and severe impact loads. This study aimed to investigate the effect of milling time on the microstructure, thermal and mechanical properties of the Al-Ni composite. For this purpose, the Al-Ni compound with a 2:1 Al:Ni molar ratio was milled for 0.5, 1, 2, 4 and 6 hours in attrition mill and mixed. Then the samples were cold press and sintered at 400 ˚C under argon atmosphere for one hour. The microstructure of samples was analyzed by field emission scanning electron microscope (FESEM) and XRD. To investigation of thermal properties DSC and DTA analysis and for mechanical properties compression test and Hopkinson test were used. The DSC analysis results showed that by increasing the milling time, the reaction start temperature decreased from 650.34 °C in the sample milled to 0.5 hour to 645.84 °C the sample milled to 6 hour and the reaction heat (enthalpy) decreased from 26.87 J/g to 14.84 J/g. The results of compression and Hopkinson tests of samples after 6 hours milling time showed 21 and 42 percent increase in compressive strength, respectively compared to samples after 0.5 hours milling time. 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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