Structure of nanocomposites of Al�?�Fe alloys prepared by mechanical alloying and rapid solidification processing

Bulletin of materials science

S K Pabi¹  S S Nayak³  B S Murty² 

[1] Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$;Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India$$Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India$$;Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$Research Associate at the University of Louisiana at Lafayette, Lafayette 70504, Louisiana, USA$$Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$Research Associate at the University of Louisiana at Lafayette, Lafayette 70504, Louisiana, USA$$Research Associate at the University of Louisiana at Lafayette, Lafayette 70504, Louisiana, USADepartment of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$Research Associate at the University of Louisiana at Lafayette, Lafayette 70504, Louisiana, USA$$

关键词: Nanocomposites;    Alâ€�?�Fe;    mechanical alloying;    rapid solidification;    quasicrystalline.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Structures of Al-based nanocomposites of Alâ€�?�Fe alloys prepared by mechanical alloying (MA) and subsequent annealing are compared with those obtained by rapid solidification processing (RSP). MA produced only supersaturated solid solution of Fe in Al up to 10 at.% Fe, while for higher Fe content up to 20 at.% the nonequilibrium intermetallic Al₅Fe₂ appeared. Subsequent annealing at 673 K resulted in more Al₅Fe₂ formation with very little coarsening. The equilibrium intermetallics, Al₃Fe (Al₁₃Fe₄), was not observed even at this temperature. In contrast, ribbons of similar composition produced by RSP formed fine cellular or dendritic structure with nanosized dispersoids of possibly a nano-quasicrystalline phase and amorphous phase along with ð›�?-Al depending on the Fe content in the alloys. This difference in the product structure can be attributed to the difference in alloying mechanisms in MA and RSP.

【 授权许可】

Unknown