High Temperature Tensile and Compressive Behaviors of Nanostructured Polycrystalline AlCoCrFeNi High Entropy Alloy: A Molecular Dynamics StudySource: Journal of Engineering Materials and Technology:;2023:;volume( 146 ):;issue: 002::page 21003-1DOI: 10.1115/1.4063802Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Molecular dynamics studies were performed to assess tensile and compressive behaviors at high temperatures up to 1200 °C for nanostructured polycrystalline AlCoCrFeNi high entropy alloy (HEA). As the temperature increased, the tensile yield stress, tensile/compressive ultimate strengths, and elastic modulus decreased, whereas the compressive yield stress remained constant. The temperature dependence of the phase structures (face-centered cubic (FCC) and hexagonal close-packed (HCP)) showed notable features between tension and compression. The HEA underwent FCC → HCP phase transformation when strained under both tension and compression. The evolution of the intrinsic stacking faults (ISFs) and extrinsic stacking faults (ESFs), which underwent FCC → HCP phase transformation, was observed. During compression, the ISFs → ESFs transition produced parallel twins. The evolution of mean dislocation length for the perfect, Shockley, and stair-rod partial dislocations was observed. Changes in the Shockley and stair-rod partial dislocations were observed after experiencing strain. The temperature dependence of the Shockley partial dislocation was high, whereas the stair-rod partial dislocation exhibited low-temperature dependence. From the simulation results, the structural usage of nanostructured polycrystalline AlCoCrFeNi HEA at elevated temperatures is recommended.
|
Collections
Show full item record
contributor author | Yoon, Sungmin | |
contributor author | Kimura, Yasuhiro | |
contributor author | Uchida, Motoki | |
contributor author | Ju, Yang | |
contributor author | Toku, Yuhki | |
date accessioned | 2024-04-24T22:39:47Z | |
date available | 2024-04-24T22:39:47Z | |
date copyright | 10/31/2023 12:00:00 AM | |
date issued | 2023 | |
identifier issn | 0094-4289 | |
identifier other | mats_146_2_021003.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4295637 | |
description abstract | Molecular dynamics studies were performed to assess tensile and compressive behaviors at high temperatures up to 1200 °C for nanostructured polycrystalline AlCoCrFeNi high entropy alloy (HEA). As the temperature increased, the tensile yield stress, tensile/compressive ultimate strengths, and elastic modulus decreased, whereas the compressive yield stress remained constant. The temperature dependence of the phase structures (face-centered cubic (FCC) and hexagonal close-packed (HCP)) showed notable features between tension and compression. The HEA underwent FCC → HCP phase transformation when strained under both tension and compression. The evolution of the intrinsic stacking faults (ISFs) and extrinsic stacking faults (ESFs), which underwent FCC → HCP phase transformation, was observed. During compression, the ISFs → ESFs transition produced parallel twins. The evolution of mean dislocation length for the perfect, Shockley, and stair-rod partial dislocations was observed. Changes in the Shockley and stair-rod partial dislocations were observed after experiencing strain. The temperature dependence of the Shockley partial dislocation was high, whereas the stair-rod partial dislocation exhibited low-temperature dependence. From the simulation results, the structural usage of nanostructured polycrystalline AlCoCrFeNi HEA at elevated temperatures is recommended. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | High Temperature Tensile and Compressive Behaviors of Nanostructured Polycrystalline AlCoCrFeNi High Entropy Alloy: A Molecular Dynamics Study | |
type | Journal Paper | |
journal volume | 146 | |
journal issue | 2 | |
journal title | Journal of Engineering Materials and Technology | |
identifier doi | 10.1115/1.4063802 | |
journal fristpage | 21003-1 | |
journal lastpage | 21003-11 | |
page | 11 | |
tree | Journal of Engineering Materials and Technology:;2023:;volume( 146 ):;issue: 002 | |
contenttype | Fulltext |