تحلیل عوامل ترمودینامیکی مؤثر بر تشکیل محلول جامد فوق اشباع نانوساختار در دستگاه آلیاژی مس-آهن با آلیاژسازی مکانیکی

نوع مقاله : علمی و پژوهشی

نویسندگان

علم و صنعت ایران

چکیده

در این پژوهش، عوامل ترمودینامیکی مؤثر در تشکیل محلول های غیرتعادلی در فرایند آلیاژسازی مکانیکی تحلیل شده‌اند. انرژی فصل مشترک، انحنای فصل مشترک و انرژی ذخیره شده در فاز بی‌شکل، عواملی هستند که در این پژوهش بررسی ‌شده‌اند. برای این‌منظور، ابتدا یک مدل هندسی- آماری برای تحلیل مجموعه‌های نانوساختار دوفازی ارائه شد. سپس، نمونه هایی با نسبت وزنی برابر از مس و آهن به‌روش مکانیکی آلیاژسازی شدند و نتایج بررسی های عملی XRD و TEM با مدل سازی انجام شده ادغام شدند. به این ترتیبت، عوامل فوق‌الذکر در دستگاه آلیاژی مس- آهن تحلیل و مقایسه شدند. نشان داده شد که مقدار بالای حد حلالیّت در این دستگاه، با تشکیل مداوم مناطق چند نانومتری بی‌شکل و تبدیل آن‌ها به محلول جامد امکان‌پذیر است.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis of Thermodynamics Factors Affecting The Formation of Nanostrucured Super Saturated Solution in Mechanical Alloying of The Cu-Fe System

نویسندگان [English]

  • Milad Mojtahedi
  • Masoud Goodarzi
  • Mohammad-Reza Aboutalebi
University of Science and Technology
چکیده [English]

In this study, the thermodynamic factors with effects on the formation of non-equilibrium solutions in mechanical alloying have been investigated. The analyzed factors were the interface energy, the interface curvature and the stored energy of amorphous phase. For this purpose, a geometrical model with statistical considerations was first developed in order to investigate the dual-phase nanostructured systems. The mechanically alloyed Cu-Fe samples with the same weight percents were then prepared. The results of experimental XRD and TEM investigations were combined with those obtained from modeling. A comparative study was conducted for the effects of the mentioned factors. It was shown that the high solubility limit in the Cu-Fe system can be obtained by the continuous formation of amorphous nanometric regions and their subsequent transformation to solid solutions.

کلیدواژه‌ها [English]

  • Mechanical alloying
  • Thermodynamics
  • Super saturated solid solution
  • Interface
  • Amorphous phase
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