تأثیر عملیات حرارتی بر خواص ریزساختاری و مکانیکی کامپوزیت هیبریدی درجای Al /Al3Zr + Al3Ti تولیدشده توسط فرایند اصطکاکی اغتشاشی

نویسندگان

گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز

چکیده

در این پژوهش، کامپوزیت هیبریدی درجای تقویت‌شده با ذرات آلومینایدی Al3Zr و Al3Ti با استفاده از فرایند اصطکاکی اغتشاشی (FSP < /span>) تولید شد. از ورق آلیاژ کار شده‌ Al 3003-H14 به‌عنوان فلز پایه و پودر فلزی خالص زیرکونیم و تیتانیم به‌عنوان تقویت‌کننده استفاده شد. تعداد شش پاس فرایند اعمال شد. استحکام کششی و سختی فلز پایه و نمونه‌های تحت فرایند اصطکاکی اغتشاشی در شرایط قبل و بعد از عملیات حرارتی آنیل اندازه‌گیری شد. ریزساختار توسط میکروسکوپ نوری و الکترونی و همچنین شناسایی فازی توسط آنالیز پراش پرتو ایکس مورد مطالعه قرار گرفت. بررسی‌های ریزساختاری نشان داد که اعمال فرایند اصطکاکی اغتشاشی منجر به تغییر ریزساختار فلز پایه از دانه‌های بزرگ و کشیده به دانه‌های ریز و هم‌محور می‌شود. همچنین مشاهده شد که وقوع واکنش شیمیایی در فصل مشترک بین ذرات فلزی با زمینه آلومینیوم باعث تشکیل درجای ترکیبات آلومینایدی Al3Zr و Al3Ti می‌شود. انجام عملیات حرارتی آنیل منجر‌به تشدید واکنش‌های شیمیایی حالت جامد و تشکیل بیشتر ترکیبات آلومینایدی می‌شود. نتایج همچنین نشان داد که کامپوزیت‌های هیبریدی پس از اعمال عملیات حرارتی آنیل بالاترین استحکام کششی و سختی را از خود نشان می‌دهد. استحکام کششی در فلز پایه از 110 مگاپاسکال به حدود 195 مگاپاسکال پس از عملیات حرارتی آنیل ارتقا یافت.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Heat Treatment on the Microstructure and Mechanical Properties of Al/Al3Zr + Al3Ti In-situ Hybrid Composite Fabricated by Friction Stir Processing

نویسندگان [English]

  • M. Zadali Mohammad Kotiyani
  • Khalil Ranjbar
Department of Materials Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

In this research, an in-situ hybrid composite reinforced by Al3Zr and Al3Ti aluminide particles was fabricated by friction stir processing (FSP). The base metal was in the form of a rolled Al 3003-H14 alloy sheet, and zirconium and titanium metal powders were used as the reinforcements. Six passes of FSP were applied. Tensile strength and hardness of the base metal, as well as FSPed samples before and after applying heat treatment, were determined. Microstructural examinations were performed using optical and scanning electron microcopy (SEM), and phase formation was identified by X-Ray diffraction. Microstructural examination revealed that by applying FSP, the prior large and elongated grains of the base metal were converted to the fine and equiaxed grains. It was also observed that chemical reactions occurred at the interface between the aluminum matrix and the metallic powders, forming in-situ aluminides of Al3Zr and Al3Ti. The post annealing heat treatment activated these solid state chemical reactions and more aluminides were formed. It was also found that the heat treated hybrid composite possessed the highest tensile strength and hardness values. The tensile strength in such samples reached 195 MPa, as compared to 110 MPa of the base metal.

کلیدواژه‌ها [English]

  • Friction stir processing
  • In-situ hybrid composite
  • Heat treatment
  • Al3Zr and Al3Ti reinforcement particles

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مواد پیشرفته در مهندسی
دوره 38، شماره 1
خرداد 1398
صفحه 49-64

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