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<p>In this study, Fe–Al was developed through multiple rolling passes followed by heat&#xa0;treatment at 500 and 1050°C using the accumulative roll bonding technique (ARB). The study gives insights of their microstructural and intermetallic formation along with interfacial integrity. The microstructure establishes the progressive diffusion of Al into Fe. The phase analysis confirmed the formation of FeAl, Fe<sub>2</sub>Al<sub>5</sub>, Al<sub>13</sub>Fe<sub>4</sub> and oxides. The microhardness of the as-rolled specimens exhibited a lower hardness of 152.3 HV due to strain hardening, while heat treatment at 500 and 1050°C showed high hardness of 291.1 and 264 HV. However, precipitate coarsening and reduced dislocation density lead to a slight decrease in hardness at 1050°C. The morphology and line mapping studies established the distribution of Fe–Al phases and oxidation effects. The results revealed that 500°C heat treatment optimizes hardness, while 1050°C leads to embrittlement.</p>

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Phase evolution and mechanical characterization of Fe–Al intermetallic processed via high-strain rolling and heat treatment

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • K Rajesh Kannan,
  • R Vaira Vignesh,
  • Kota Pavan Kalyan,
  • Sudheer Reddy Beyanagari,
  • M Govindaraju

摘要

In this study, Fe–Al was developed through multiple rolling passes followed by heat treatment at 500 and 1050°C using the accumulative roll bonding technique (ARB). The study gives insights of their microstructural and intermetallic formation along with interfacial integrity. The microstructure establishes the progressive diffusion of Al into Fe. The phase analysis confirmed the formation of FeAl, Fe2Al5, Al13Fe4 and oxides. The microhardness of the as-rolled specimens exhibited a lower hardness of 152.3 HV due to strain hardening, while heat treatment at 500 and 1050°C showed high hardness of 291.1 and 264 HV. However, precipitate coarsening and reduced dislocation density lead to a slight decrease in hardness at 1050°C. The morphology and line mapping studies established the distribution of Fe–Al phases and oxidation effects. The results revealed that 500°C heat treatment optimizes hardness, while 1050°C leads to embrittlement.