Micropillar compression response of femtosecond laser-cut single crystal Cu and proton irradiated Cu

Gigax, Jonathan; Vo, H.T.; McCulloch, Q.; Chancey, M.; Wang, Yongqiang; Maloy, Stuart A.; Li, Nan; Hosemann, Peter

doi:10.1016/j.scriptamat.2019.05.004

Cited by 32 publications

(6 citation statements)

References 20 publications

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“…We do not explore the extent of damage caused by the technique, but rely on prior studies that have shown that the damage for metals is limited to a few micrometers below the surface. 7,8,19 It is not expected that, for the laser parameters used here, the damage should significantly exceed prior findings. For the 316L foil and AM91, a laseraffected region a few micrometers below the surface would comprise less than 5% of the response, well within the variation observed from measurements.…”

Section: Discussionmentioning

confidence: 51%

“…Another study also looked at the effects of the femtosecond laser process on the production of micropillars. 8 A FIB was used to mill away 5 lm of the suspected HAZ after the laser processing, which created results similar to a purely FIB-based approach during compression testing. Since the mechanical test specimens were on the length scale of the HAZ, its effects could not be ignored and needed to be removed.…”

Section: Introductionmentioning

confidence: 99%

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Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Harvey

Torrez

Lam

et al. 2021

JOM

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Femtosecond laser machining offers a fast, low damage route to fabricating features on the order of a few micrometers to millimeters. Within this broad application space, mechanical testing samples on this scale provides a combination of region selectivity and a bulk-like response. Use of such mechanical test specimens, however, is relatively unexplored compared to microscale and macroscale testing. The present study showcases the benefit of combining efficient specimen fabrication and testing on the mesoscale for extracting a more comprehensive picture of material mechanical properties. Moreover, a material with a complex and heterogeneous microstructure, additively manufactured grade 91, has also been studied to highlight the considerations needed and limitations of testing on this scale.

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Section: Discussionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Harvey

Torrez

Lam

et al. 2021

JOM

Self Cite

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show abstract

“…Hardness and modulus measurements were computed using the Oliver-Pharr method, assuming a Poisson ratio of 0.3 [37]. For microtensile testing, small scale tensile specimens were fabricated using a femtosecond laser cutting system and procedure described in previous studies [38][39][40]. Tensile specimens were cut using an output pulse width of 350 fs, wavelength of 1053 nm, repetition rate of 20 kHz, and energy of 10 µJ focused through a 5x objective.…”

Section: Methodsmentioning

confidence: 99%

Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining

et al. 2021

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Beyond the current commercial materials, refining the grain size is among the proposed strategies to manufacture resilient materials for industrial applications demanding high resistance to severe environments. Here, large strain machining (LSM) was used to manufacture nanostructured HT-9 steel with enhanced thermal stability, mechanical properties, and ductility. Nanocrystalline HT-9 steels with different aspect rations are achieved. In-situ transmission electron microscopy annealing experiments demonstrated that the nanocrystalline grains have excellent thermal stability up to 700 °C with no additional elemental segregation on the grain boundaries other than the initial carbides, attributing the thermal stability of the LSM materials to the low dislocation densities and strains in the final microstructure. Nano-indentation and micro-tensile testing performed on the LSM material pre- and post-annealing demonstrated the possibility of tuning the material’s strength and ductility. The results expound on the possibility of manufacturing controlled nanocrystalline materials via a scalable and cost-effective method, albeit with additional fundamental understanding of the resultant morphology dependence on the LSM conditions.

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“…Furthermore, most micromechanical testing studies rely on samples prepared using laser, ion beam, reactive ion etching etc. leading to a damaged surface layer that influences the deformation behavior [7,8]. Recent reviews highlight the few techniques that are available for manufacturing small-scale metal samples, including traditional FIB milling, template-based electrodeposition and a few recent additive micromanufacturing techniques [9,10].…”

Section: Introductionmentioning

confidence: 99%

Anomalous High Strain Rate Compressive Behavior of Additively Manufactured Copper Micropillars

Ramachandramoorthy¹,

Kalácska²,

Poras³

et al. 2022

Preprint

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Microscale dynamic testing is vital to the understanding of material behavior at application relevant strain rates. However, despite two decades of intense micromechanics research, the testing of microscale metals has been largely limited to quasi-static strain rates. Here we report the dynamic compression testing of pristine 3D printed copper micropillars at strain rates from ∼ 0.001 s −1 to ∼ 500 s −1 . It was identified that microcrystalline copper micropillars deform in a single-shear like manner exhibiting a weak strain rate dependence at all strain rates. Ultrafine grained (UFG) copper micropillars, however, deform homogenously via barreling and show strong rate-dependence and small activation volumes at strain rates up to ∼ 0.1 s −1 , suggesting dislocation nucleation as the deformation mechanism. At higher strain rates, yield stress saturates remarkably, resulting in a decrease of strain rate sensitivity by two orders of magnitude and a four-fold increase in activation volume, implying a transition in deformation mechanism to collective dislocation nucleation.

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Micropillar compression response of femtosecond laser-cut single crystal Cu and proton irradiated Cu

Cited by 32 publications

References 20 publications

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining

Anomalous High Strain Rate Compressive Behavior of Additively Manufactured Copper Micropillars

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