| Autor: |
Shuai Tong, Guoxiang Shen, Zhengchen Han, Zhichao Ma, Yang Sun, Shanyue Guan, Hongwei Zhao, Luquan Ren, Chuliang Yan |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Journal of Materials Research and Technology, Vol 28, Iss , Pp 2792-2799 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2238-7854 |
| DOI: |
10.1016/j.jmrt.2023.12.215 |
| Popis: |
To investigate the effect of temperature on the compressive strength of CoCrFeMnNi high entropy alloy with lattice structures prepared by powder bed fusion, the mechanical properties of the lattice structures at a temperature in a range from 20 °C to 900 °C were obtained through a self-developed in-situ mechanical-thermal coupling compressive system. The real-time deformation behaviors of the lattice structures were observed by an optical-infrared dual-spectrum imaging system. The experimental results indicated that the compressive strength, structural stiffness, and energy absorption of the specimens increased with the increasing temperature ranging from 20 °C to 600 °C during the load-bearing stage, accompanied by a fracture mode from cleavage step to dimple. At an elevated temperature of 900 °C, the specimens exhibited the worst compressive strength and structural stiffness but the highest densification strain. Significantly, the temperature-dependent deformation behaviors were revealed, as the gradually increased temperature promoted the deformation failure behavior transforming from “layer by layer” to “45° shear band”. The improved plasticity at elevated temperatures enhanced the deformation capacity of lattice structures, released the local concentrated load and effectively weakened the stress concentration. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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