High temperature deformation behavior of Al0.2CoCrFeNiMo0.5 high entropy alloy: Dynamic strain ageing

Palguna, Yasam and Kotla, Sairam and Korla, Rajesh (2023) High temperature deformation behavior of Al0.2CoCrFeNiMo0.5 high entropy alloy: Dynamic strain ageing. Journal of Alloys and Compounds, 930. pp. 1-9. ISSN 0925-8388

Text
Journal_of_Alloys_and_Compounds__.pdf - Published Version
Restricted to Registered users only
Download (12MB) | Request a copy

Abstract

High temperature deformation behavior of Al0.2CoCrFeNiMo0.5 high entropy alloy was investigated in fully annealed condition. Microstructural studies were performed using SEM and EBSD, prior to testing, clearly shows a fully annealed microstructure consists of secondary sigma phase in the FCC matrix. Uniaxial tensile tests were performed in the temperature range of 25–900 °C at an initial strain rate of 10−3 s−1. Serrated plastic flow behavior was observed in the intermediate temperature range of 400–600 °C. The influence of the strain rate on the critical strain corresponding to the onset of serrations were studied which indicated that the serration behavior was type A and type C. Strain rate sensitivity close to zero, decrease in the elongation and microstructural investigations suggesting that dynamic strain aging (DSA) is the responsible mechanism for the serrated flow and that the Al solute interactions with dislocations might be the possible reason for DSA. Additionally, the fractography analysis clearly indicates that there is transition in the failure mode from the transgranular fracture to the intergranular fracture. © 2022 Elsevier B.V.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Korla, Rajesh	UNSPECIFIED

Item Type:

Article

Additional Information:

The authors gratefully acknowledge ECR –SERB (grant number ECR/2017/001278 for funding the project) and DST-FIST ( SR/FST/ETI-421/2016 ) for funding FE-SEM, used in the present work. Authors also thankful to Mr. Chenna Krishna for his help in melting the alloy.

Uncontrolled Keywords:

Dynamic strain ageing; High entropy alloys; High temperature deformation; Strain rate sensitivity

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

17 Oct 2022 07:09

Last Modified:

17 Oct 2022 07:09