تولید و مشخصه یابی کامپوزیت نانوساختار Al-Mg-Zn/ 3 wt.% Al2O3 بوسیله زمینه پیش آسیاب شده توسط آلیاژسازی مکانیکی

نویسندگان

1 1- گروه فلزات، پژوهشکده مواد، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان

2 2- دانشکده مهندسی، دانشگاه شیراز

3 3- مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران

چکیده

پودر کامپوزیتی نانوساختار Al-Zn-Mg/3wt.% Al2O3 از طریق آلیاژسازی مکانیکی تولید شد. ابتدا، اجزای میکرومتری زمینه آلیاژ 7014 برای 20 ساعت در یک آسیای سیاره‌ای آسیا شده و سپس سه درصد وزنی ذرات میکرومتری آلومینا به زمینه افزوده شده و پودر کامپوزیتی نانوساختار در زمان‌های مختلف آسیا‌کاری برای بررسی اثر زمان آسیا‌کاری بر مشخصات پودر تولید شده نظیر مورفولوژی، اندازه کریستالیت، کرنش شبکه و میکروسختی تولید شد. نتایج مشخصه‌یابی نشان داد تولید پودر نانوساختار کامپوزیتی با مقدار کمی تقویت‌ کننده میکرومتری علاوه بر زمینه پیش‌آسیا شده ممکن است. همچنین، تولید پودری با کمینه اندازه کریستالیت 24 نانومتر و کمینه اندازه ذرات 5 میکرومتر تأیید گردید. علاوه بر این، حالت پایا پس از حدود 20 ساعت آسیا‌کاری رخ داد و آسیا‌کاری بیشتر بر مشخصات پودر به‌جز اندازه کریستالیت، کرنش شبکه و میکروسختی اثرگذار نبود. همچنین، نشان داده شد که با افزایش زمان آسیا‌کاری، قابلیت تف‌جوشی به‌دلیل کاهش اندازه ذرات افزایش یافت. اما پس از حالت پایا قابلیت تف‌جوشی تغییر نکرد.
 

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis and Characterisation of Al-Zn-Mg /3 wt. %Al2O3 Nanostructured Composite using a Pre-milled Matrix Through Mechanical Alloying

نویسندگان [English]

  • M. Hajizamani 1
  • M. Alizadeh 1
  • S.A. Jenabali-Jahromi 2
  • A. Alizadeh 3
1 1. Department of Metals, Materails Devision, Institute of Science and High Technology and Environmental Sciences, Graduate University Kerman, Iran
2 2. School of Engineering, Shiraz University, Shiraz, Iran
3 3. Faculty of Materials & Manufacturing Processes, Malek-e-Ashtar University of Technology, Tehran, Iran
چکیده [English]

Al-Zn-Mg/3 wt-% Al2O3 nanostructured composite powder was synthesized through Mechanical Alloying (MA). At first, the 7014 alloy matrix constituents were milled in a planetary ball mill for 20 hours. Then, 3 wt.% µ-Al2O3 particles were  added to the pre-milled matrix and the nanostructured composite powder was produced at different MA times to investigate the effects of MA time on the characteristics of the produced composite powders such as morphology, crystallite size, lattice strain and microhardness. The characterization results proved that synthesizing nanostructured composite powder with a low amount of micrometric reinforcements in addition to pre-milled micrometric matrix is possible. Also, synthesis of the nanostructured composite powder with the minimum crystallite size of 24 nm and the minimum mean particle size of 5 µm was confirmed. Moreover, the steady state occurred after around 20 hours milling and further milling did not affect the powder characteristics excluding crystallite size, lattice strain and microhardness. In addition, sinterability of the composite powders increased with increasing the milling time due to decreased average particle size. However, after the steady state, the sinterability did not change.
 
 

کلیدواژه‌ها [English]

  • mechanical alloying
  • Pre-Milled Matrix
  • Nanostructured Powder
  • Sinterability

مراجع

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مواد پیشرفته در مهندسی
دوره 36، شماره 2
شهریور 1396
صفحه 1-13

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