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Meeting Materials Science & Technology 2020
Symposium Light Metal and Composites Technology
Presentation Title Metastable f.c.c. Phase and Its Influence on the Soft-magnetic Properties of FeCoNiAlxSix (0.2 < x < 0.5) Alloys
Author(s) Tanjore V. Jayaraman, Ramasis Goswami
On-Site Speaker (Planned) Tanjore V. Jayaraman
Abstract Scope Significant improvement in soft-magnetic properties of FeCoNiAlxSix (0.2 < x < 0.5) high-entropy alloys is achievable when the alloys are comprised of metastable f.c.c. phase. The nanocrystalline FeCoNiAl0.375Si0.375 alloy fabricated by mechanically alloying the constituent elements resulted in the formation of metastable f.c.c. phase. The metastable phase was stable up to ~800 K and thereafter it dissociated. At ambient temperature, the magnetic saturation (MS) and coercivity (HC) of the alloy was ~91 Am2/kg and ~5 kA/m, respectively. The magnetic characterization from 60 K to 900 K showed a steady decrease in MS, and the HC initially decreased and subsequently increased. The thermally-treated alloy exhibited improvement in the soft-magnetic properties while retaining the nanocrystallinity. While fabrication of the alloys by equilibrium processing facilitates the formation of two phases—b.c.c. and f.c.c., fabrication by mechanical alloying promotes the formation of metastable f.c.c. phase having relatively superior soft-magnetic properties and good thermal stability.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel Equiatomic and Non-equiatomic Low-density High Entropy Alloys and Composites
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Effect of Cu Content on Tensile and Low Cycle Fatigue Properties of Cast Al-Cu-Mn-Zr Alloys
Functional Relationships between Treatment Time, Microstructure and Mechanical Properties of Ultrasonically Cast Metal Matrix Nanocomposites
Introductory Comments: Light Metals and Composite Technology
Joining of Light Metals to Polymer Composites by Overcasting Technique
Metastable f.c.c. Phase and Its Influence on the Soft-magnetic Properties of FeCoNiAlxSix (0.2 < x < 0.5) Alloys
Microstructure and Interfaces of Nanocomposites Manufactured in Solid State
Microstructure, Interfaces, and Mechanical Properties of Ceramic Matrix Composites
Nanostructured Composites via Environmentally Controlled Pressure Assisted Sintering
Poly(Carborane-siloxane-(aryl)Acetylene)s: A Versatile Inorganic-Organic Polymer Platform for Advanced Materials Applications
Revisiting Phase Field Simulations of Theta’ Variant Selection during Stress Aging of Al-Cu Alloys

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