Enhanced fatigue resistance and fatigue-induced substructures in an additively manufactured CoCrNi medium-entropy alloy treated by ultrasonic surface rolling …

X Chen, T Lu, N Yao, H Chen, B Sun, Y Xie… - International Journal of …, 2023 - Elsevier
There is a significant need to elucidate the underlying mechanisms of cyclic plastic damage
mechanism for additively manufactured materials and develop effective surface modification …

Optimized bilateral ultrasonic surface rolling process assisting directed energy deposition of thin-walled medium-entropy alloy with high mechanical performance

Y Chen, T Lu, X Chen, B Sun, N Yao, K Li, J Qiu… - Additive …, 2023 - Elsevier
Laser directed energy deposition (DED) offers significant advantages for the integral
manufacturing of large-scaled thin-walled workpieces. Nevertheless, how to improve the …

In-situ formed oxide enables extraordinary high-cycle fatigue resistance in additively manufactured CoCrFeMnNi high-entropy alloy

YK Kim, MS Baek, S Yang, KA Lee - Additive Manufacturing, 2021 - Elsevier
The high-cycle fatigue (HCF) properties and deformation behavior of additively
manufactured equiatomic CoCrFeMnNi high-entropy alloys (HEAs), strengthened by in-situ …

Deformation mechanisms of CoCrFeMnNi high-entropy alloy under low-cycle-fatigue loading

K Lu, A Chauhan, AS Tirunilai, J Freudenberger… - Acta Materialia, 2021 - Elsevier
Plastic deformation during low-cycle fatigue (LCF) in equiatomic face-centered cubic (FCC)
CoCrFeMnNi high-entropy alloys (HEAs) is accumulated by dislocation substructure …

Tensile overload-induced texture effects on the fatigue resistance of a CoCrFeMnNi high-entropy alloy

TN Lam, HH Chin, X Zhang, R Feng, H Wang… - Acta Materialia, 2023 - Elsevier
The present study investigates the crystallographic-texture effects on the improved fatigue
resistance in the CoCrFeMnNi high-entropy alloys (HEAs) with the full-size geometry of the …

Grain-size-dependent microstructure effects on cyclic deformation mechanisms in CoCrFeMnNi high-entropy-alloys

MY Luo, TN Lam, PT Wang, NT Tsou, YJ Chang… - Scripta Materialia, 2022 - Elsevier
The effect of grain size on strain-controlled low-cycle fatigue (LCF) properties in the
CoCrFeMnNi high-entropy alloys (HEAs) was investigated towards the distinct …

On the low-cycle fatigue response of CoCrNiFeMn high entropy alloy with ultra-fine grain structure

S Picak, T Wegener, SV Sajadifar, C Sobrero, J Richter… - Acta Materialia, 2021 - Elsevier
Abstract High Entropy Alloys (HEAs) are a new class of multi-component alloys with
excellent tensile strength-ductility combination. Their yield strength levels, however, are still …

Multiple deformation scheme in direct energy deposited CoCrNi medium entropy alloy at 210K

YS Kim, H Chae, W Woo, DK Kim, DH Lee… - Materials Science and …, 2021 - Elsevier
CoCrNi medium entropy alloy (MEA) and stainless steel 316L (SS316L) were manufactured
by direct energy deposition of additive manufacturing (DED-AM). Exceptional mechanical …

The relationship between thermo-mechanical history, microstructure and mechanical properties in additively manufactured CoCrFeMnNi high entropy alloy

H Li, Y Huang, J Sun, Y Lu - Journal of Materials Science & Technology, 2021 - Elsevier
Here, a single-track CoCrFeMnNi high entropy alloy (HEA) was successfully fabricated by
laser melting deposition (LMD). Combining the experimental observations and numerical …

[HTML][HTML] Enhancement of fatigue resistance by overload-induced deformation twinning in a CoCrFeMnNi high-entropy alloy

TN Lam, SY Lee, NT Tsou, HS Chou, BH Lai, YJ Chang… - Acta Materialia, 2020 - Elsevier
We examined fatigue-crack-growth behaviors of CoCrFeMnNi high-entropy alloys (HEAs)
under as-fatigued and tensile-overloaded conditions using neutron-diffraction …