scholarly journals COMPARATIVE STUDY OF HELIUM BUBBLE FORMATION IN Cr-Fe-Ni-Mn HIGH-ENTROPY ALLOY AND 18Cr10NiTi STEEL AFTER IRRADIATION AND POST-IRRADIATION ANNEALING

2019 ◽  
pp. 25-29
Author(s):  
А.S. Kalchenko ◽  
S.A. Karpov ◽  
I.E. Kopanets ◽  
M.A. Tikhonovsky ◽  
G.D. Tolstolutskaya
Keyword(s):  
Room Temperature ◽  
Ion Irradiation ◽  
Identical Condition ◽  
Bubble Formation ◽  
Austenitic Stainless Steels ◽  
High Entropy Alloy ◽  
Helium Bubble ◽  
High Entropy ◽  
Helium Ion ◽  
Displacement Per Atom

High entropy alloys (HEAs) are considered for applications in nuclear reactors due to their promising mechanical properties, corrosion and radiation resistance. In order to understand the irradiation effects in HEAs and to demonstrate their potential advantages over conventional austenitic stainless steels, we performed helium ion irradiation experiments with 20Cr-40Fe-20Ni-20Mn high-entropy alloy and 18Cr10NiTi steel under an identical condition. Both alloys have been irradiated to a dose of 4.8 displacement per atom (dpa) and a helium concentration of 11.7 at.% at room temperature. After subsequent annealing at 500 °C the microstructure evolution of irradiated materials was examined. The irradiation promotes the formation of a high density of bubbles in HEA and steel. Comparison of parameters of helium porosity in these materials has been done.

On the room temperature deformation mechanisms of a TiZrHfNbTa refractory high-entropy alloy

2015 ◽  
Vol 645 ◽  
pp. 255-263 ◽  
Author(s):  
J.-Ph. Couzinié ◽  
L. Lilensten ◽  
Y. Champion ◽  
G. Dirras ◽  
L. Perrière ◽  
...  
Keyword(s):  
Room Temperature ◽  
Deformation Mechanisms ◽  
Temperature Deformation ◽  
High Entropy Alloy ◽  
High Entropy

Mechanical behavior of the HfNbZrTi high entropy alloy after ion irradiation based on micro-pillar compression tests

2022 ◽  
Vol 892 ◽  
pp. 162043
Author(s):  
Shengyuan Peng ◽  
Ke Jin ◽  
Xin Yi ◽  
Zhaohui Dong ◽  
Xun Guo ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Ion Irradiation ◽  
High Entropy Alloy ◽  
Compression Tests ◽  
High Entropy

scholarly journals Laser Beam Welding of a Low Density Refractory High Entropy Alloy

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1351 ◽  
Author(s):  
Evgeniya Panina ◽  
Nikita Yurchenko ◽  
Sergey Zherebtsov ◽  
Nikita Stepanov ◽  
Gennady Salishchev ◽  
...  
Keyword(s):  
Laser Beam ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Laser Beam Welding ◽  
Base Material ◽  
Laves Phase ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Grains Refinement ◽  
Cast Condition

The effect of laser beam welding on the structure and properties of a Ti1.89NbCrV0.56 refractory high entropy alloy was studied. In particular, the effect of different pre-heating temperatures was examined. Due to the low ductility of the material, laser beam welding at room temperature resulted in the formations of hot cracks. Sound butt joints without cracks were produced using pre-heating to T ≥ 600 °C. In the initial as-cast condition, the alloy consisted of coarse bcc grains with a small amount of lens-shaped C15 Laves phase particles. A columnar microstructure was formed in the welds; the thickness of the grains increased with the temperature of pre-heating before welding. The Laves phase particles were formed in the seams after welding at 600 °C or 800 °C, however, these particles were not observed after welding at room temperature or at 400 °C. Soaking at elevated temperatures did not change the microstructure of the base material considerably, however, “additional” small Laves particles formed at 600 °C or 800 °C. Tensile test of welded specimens performed at 750 °C resulted in the fracture of the base material because of the higher hardness of the welds. The latter can be associated with the bcc grains refinement in the seams.

scholarly journals Mechanical and microstructural response of the Al0.5CoCrFeNi high entropy alloy to Si and Ni ion irradiation

2020 ◽  
Vol 25 ◽  
pp. 100813 ◽  
Author(s):  
M. Aizenshtein ◽  
Z. Ungarish ◽  
K.B. Woller ◽  
S. Hayun ◽  
M.P. Short
Keyword(s):  
Ion Irradiation ◽  
High Entropy Alloy ◽  
High Entropy

Monocrystalline elastic constants of fcc-CrMnFeCoNi high entropy alloy

MRS Advances ◽  
2017 ◽  
Vol 2 (27) ◽  
pp. 1429-1434 ◽  
Author(s):  
Katsushi Tanaka ◽  
Takeshi Teramoto ◽  
Ryo Ito
Keyword(s):  
Solid Solution ◽  
Elastic Constants ◽  
Room Temperature ◽  
Entropy Change ◽  
High Entropy Alloy ◽  
Melting Points ◽  
High Entropy ◽  
Fcc Metals ◽  
Cauchy Pressure ◽  
Fcc Structure

ABSTRACTMono-crystalline elastic constants of equiatomic quinary Cr-Mn-Fe-Co-Ni high entropy alloy with the fcc structure have experimentally been determined by a resonance ultrasound spectroscopy at room temperature. The values of the bulk modulus of the high entropy alloy experimentally determined are similar to other conventional fcc metals when the values are normalized by the melting points. This indicates that the entropy change at melting is similar to that of conventional metals. The values of Pough’s index and the Cauchy pressure are determined as 1.79 and -11.6 GPa, respectively. When the ductility of the alloy is judged from the indices, the ductility of the high entropy alloy is limited. In order to explain the negative Cauchy pressure of the high entropy alloy, it is required to assume that relatively strong directional interatomic bondings like intermetallic compounds exist in the alloy though the crystal is disordered solid solution.

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