Microstructure and high temperature mechanical properties of refractory Cr-Nb-Ti-Zr alloy prepared by laser directed energy deposition
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F25%3AN0000030" target="_blank" >RIV/26316919:_____/25:N0000030 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S2352492825014631" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352492825014631</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.mtcomm.2025.112951" target="_blank" >10.1016/j.mtcomm.2025.112951</a>
Alternative languages
Result language
angličtina
Original language name
Microstructure and high temperature mechanical properties of refractory Cr-Nb-Ti-Zr alloy prepared by laser directed energy deposition
Original language description
The microstructure and mechanical properties of Cr-Nb-Ti-Zr complex concentrated alloy (CCA) prepared from the blend of elemental powders by laser directed energy deposition (L-DED) technique were investigated. Variation of the laser power and laser-induced substrate platform preheating were utilized to deposit 3D bulk samples. Deposition at maximum laser power of 500 W followed by long-term homogenization heat treatment at 1200 degrees C results in the crack free, locally homogeneous material. The final chemical composition of the deposited sample Cr15-Nb28-Ti23-Zr34 differs from the equimolar composition of the blended elemental powders due to Cr evaporation during deposition. The homogenized microstructure is formed by equiaxed grains with the size below 100 mu m and fine Cr2(Zr, Nb, Ti) Laves phase particles dispersed predominantly at grain boundaries. Mechanical properties were investigated by compression tests at RT, 400 degrees C and 800 degrees C. At RT, the homogenized alloy exhibits yield stress of 1558 MPa (ductility is about 8 %). Deformation at 400 degrees C decreases the yield stress by 20 %, while the ductility remained unchanged. Serrated flow appearing at compression curves at 400 degrees C can be attributed to the PLC effect. It was shown that L-DED technique can produce refractory CCAs directly from elemental powders by careful optimization of processing parameters. Deposition with a thermally insulating platform effectively suppresses crack formation and reduces the number of unmelted Nb particles. However, the utilization of the homogenization heat treatment after the deposition is required to achieve microstructural homogeneity at the length-scale of powder particles (tens of micrometers).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
<a href="/en/project/TK04020331" target="_blank" >TK04020331: Additive Manufacturing of Nuclear Fuel Components</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
MATERIALS TODAY COMMUNICATIONS
ISSN
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e-ISSN
2352-4928
Volume of the periodical
47
Issue of the periodical within the volume
JUL 2025
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
nestránkováno
UT code for WoS article
001506825000012
EID of the result in the Scopus database
2-s2.0-105007158190