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Alloying behavior and thermal stability of mechanically alloyed nano AlCoCrFeNiTi high-entropy alloy

Published online by Cambridge University Press:  15 February 2019

Vikas Shivam Open the ORCID record for Vikas Shivam [Opens in a new window] ,
Yagnesh Shadangi ,
Joysurya Basu  and
Nilay Krishna Mukhopadhyay
Vikas Shivam*
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
Yagnesh Shadangi
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
Joysurya Basu
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
Nilay Krishna Mukhopadhyay
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this investigation, we have reported the alloying behavior, phase evolution, and thermal stability of equiatomic AlCoCrFeNiTi high-entropy alloy (HEA). The 40 h milled powder shows good chemical homogeneity with agglomerated particles varying in the range of ∼3–18 μm. The formation of a nanostructured single-phase BCC (a = 2.85 ± 0.01 Å) was observed along with the minor tungsten carbide (WC) phase that formed due to contamination during milling. Thermal stability of the alloy has been studied using dynamic differential scanning calorimetry (DSC) thermogram and in situ X-ray diffraction. It has been found that this HEA is stable up to 600 °C (873 K). Consolidated samples at 1000 °C (1273 K) showed the transformation of body centered cubic (BCC) phase into the B2 (a = 2.87 ± 0.03 Å) phase co-existing with minor hexagonal WC (a = 2.90 Å, c = 2.83 Å) phase.

Keywords

mechanical alloyinghigh-entropy alloysthermal stabilitymicrowave sinteringB2 phase
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 787 - 795
Copyright
Copyright © Materials Research Society 2019 

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