نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری تخصصی، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت، تهران .

2 دانشجوی دکتری تخصصی ، دانشکده مهند سی مکانیک ، دانشگاه تهران، تهرا ن.

3 دانشج وی دکت ری تخصصی ، دانشکده مهند سی مکانیک ، دانشگاه علم و صنعت، تهران.

4 دانشیار ، دانشکده مهندسی مکانیک ، دانشگاه علم و صنعت، تهران.

10.22068/jstc.2021.118997.1617

چکیده

در چند سال اخیر، ساخت ورق های کامپوزیتی لایه‌ای به روش پیوند نوردی مورد توجه محققین قرار گرفته است. در این تحقیق، به بررسی خواص مکانیکی و چقرمگی شکست ورق کامپوزیتی سه لایه آلومینیوم-منیزیم-آلومینیوم تولید شده به روش پیوند سرد نوردی پرداخته شد. خواص مکانیکی و سطح مقطع شکست نمونه‌ها به ترتیب به‌وسیله آزمایش کشش تک-محوره، آزمایش سختی و میکروسکوپ الکترونی روبشی مطالعه شد. همچنین چقرمگی شکست تنش صفحه‌ای به صو‌رت تجربی اندازه گیری شد. مشاهده شد استحکام کششی برای نمونه کامپوزیتی نسبت به آلومینیوم و مقادیر میکروسختی و چقرمگی شکست نسبت به نمونه‌های اولیه افزایش یافته است. اعمال کارسرد را می‌توان دلیل اصلی افزایش سختی و چقرمگی دانست و علت افت استحکام کامپوزیت نسبت به منیزیم، ایجاد ناپایداری پلاستیکی در تقویت‌کننده منیزیم به دلیل اعمال کرنش بالاست. همچنین نتایج حاصل از میکروسکوپ الکترون روبشی نشان می‌دهد که مکانیزم شکست برای لایه آلومینیوم نرم و برای منیزیم ترد است و سطح مقطع شکست در لایه آلومینیوم نسبت به آلومینیوم اولیه، دارای میکروحفرات کم‌عمق‌تر و کوچک‌تر می‌باشد، که نشان‌دهنده شکست نرم برشی است.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of mechanical properties and fracture toughness of aluminum-magnesium-aluminum composite produced by cold roll bonding process

نویسندگان [English]

  • Mohammad Delshad Gholami 1
  • Davood Rahmatabadi 2
  • Taghi Shojaee 3
  • Ramin Hashemi 4
  • Bijan Mohammadi 4

1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

2 School of Mechanical Engineering, University of Tehran, Tehran, Iran.

3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

4 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.

چکیده [English]

In the last few years, researchers have been interested in the fabrication of laminated composite sheets. In this research, mechanical properties and fracture toughness of three-layer aluminum-magnesium-aluminum composite sheet produced by cold-rolling bonding method were investigated. Mechanical properties and fracture cross-sections of the specimens were studied by uniaxial tensile test, hardness test and scanning electron microscopy, respectively. It was observed that the tensile strength of composite specimens was higher than that of aluminum and the microhardness and fracture toughness values were increased compared to the initial specimens. High applied cold work can be the main reason for the increase in hardness and fracture toughness, and the reason for the decrease in composite strength over magnesium is the creation of plastic instability in the magnesium reinforcer due to the high strain.The results of scanning electron microscopy also show that the fracture mechanism is for the soft aluminum layer and for the crisp magnesium and the surface of the fracture cross section in the aluminum layer has a shallower and smaller micropores, indicating shear ductile fracture.

کلیدواژه‌ها [English]

  • Cold Roll Bonding
  • Fracture toughness
  • Mechanical properties
  • Layered Composite
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