Radiation-induced helium bubbles in metals

SH Li, JT Li, WZ Han - Materials, 2019 - mdpi.com
Helium (He) bubbles are typical radiation defects in structural materials in nuclear reactors
after high dose energetic particle irradiation. In the past decades, extensive studies have …

A micropillar compression investigation into the plastic flow properties of additively manufactured alloys

SH Li, Y Zhao, J Radhakrishnan, U Ramamurty - Acta Materialia, 2022 - Elsevier
Solidification cells and a high density of dislocations are two common features of additively
manufactured (AM) alloys that are processed using techniques such as laser powder bed …

Helium irradiation-induced ultrahigh hardening in niobium

JT Li, IJ Beyerlein, WZ Han - Acta Materialia, 2022 - Elsevier
In this work, using in-situ uniaxial tensile and compressive testing, microscopy, and
theoretical analysis, we study the mechanism underlying the ultrahigh irradiation hardening …

Role of low-level void swelling on plasticity and failure in a 33 dpa neutron-irradiated 304 stainless steel

HT Vo, D Frazer, AA Kohnert, S Teysseyre… - International Journal of …, 2023 - Elsevier
Radiation damage introduces a wide range of defects in structural materials depending on
the irradiation conditions. Irradiation-induced loops are known to lead to dislocation …

Atomic-scale hidden point-defect complexes induce ultrahigh-irradiation hardening in tungsten

RY Zheng, WR Jian, IJ Beyerlein, WZ Han - Nano Letters, 2021 - ACS Publications
Tungsten displays high strength in extreme temperature and radiation environments and is
considered a promising plasma facing material for fusion nuclear reactors. Unlike other …

Large-scale potassium-doped tungsten alloy with superior recrystallization resistance, ductility and strength induced by potassium bubbles

X Ma, X Zhang, T Wang, S Lang, W Lv, Y Wang… - Journal of Nuclear …, 2022 - Elsevier
Potassium-doped tungsten (KW) plate with a weight of 25 kg was prepared by hot rolling.
Subsequently, part of the KW suffered annealing at 1600, 1800° C for 0.5 h. For the rolled …

In situ micro-pillar compression to examine radiation-induced hardening mechanisms of FeCrAl alloys

Y Cui, E Aydogan, JG Gigax, Y Wang, A Misra… - Acta Materialia, 2021 - Elsevier
Abstract The effects of 5 MeV Fe 2+ ion irradiation at 300° C on the microstructure evolution
and deformation behavior of a FeCrAl C26M alloy are presented. It has been found that …

Comparative study of radiation defects in ion irradiated bulk and thin-foil tungsten

RY Zheng, WZ Han - Acta Materialia, 2020 - Elsevier
In this study, we employ transmission electron microscope (TEM) to analyze radiation
defects in helium (He) and krypton (Kr) ions implanted bulk and thin-foil tungsten. For bulk …

Effects of helium cavity size and morphology on the strength of pure titanium

CR Lear, JG Gigax, O El Atwani, MR Chancey, H Kim… - Scripta Materialia, 2022 - Elsevier
High-purity α-titanium was implanted with helium to observe cavity morphology–size,
number density, and form (ie, bubbles vs. voids)–effects on materials strength. Increasing …

Micropillar compression investigation on the mechanical behavior of Ni manufactured using laser powder bed fusion

SH Li, Y Zhao, KB Lau, P Wang, R Upadrasta - Materials Science and …, 2023 - Elsevier
Micropillar compression tests were performed on unalloyed Ni that was manufactured using
the additive manufacturing (AM) technique of laser powder bed fusion (LPBF) with …