132 Prakt. Met. Sonderband 52 (2018)
2500 _ | URN
'—— initial state, air |
0 ee 800°C / 20 h, air lL
5 2000! - - -800°C/20 h, H2, 100 bar .
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1000 |
|
+ 500! BTR
3 .
: Geel”
od ae - | . de jt
0 2 4 3 10 12 he
compressive strain [%] ¢ N
Fig. 6: Results of the compressions test at room temperature or
One reason for the good mechanical compressive properties could be small clusters in the
two main phases as seen in SEM pictures (Fig. 2d). N
3. SUMMARY WU
In this work the microstructure as well as the precipitation structure of a high entropy alloy ke
Al-Cu-Ni-Ti-V with an equiatomic composition (AI20Fe20Ni20Ti20V20 in at.%) was we
characterised. The microstructure of the materials consists of fcc (solid solution) and bec HM
phases (Cu rich precipitates) and many different other phases. The ATP investigations >
show homogeneously distributed clusters of vanadium (ca. 2 — 3 nm in diameter) in the
solid solution of the alloy. The results of compression tests in air and in hydrogen
atmosphere show a great potential concerning resistance of the investigated material to {EN
the hydrogen embrittlement. The hardness as well as the compression strength are very
high and the ductility on the acceptable level. Further optimization of the material is lez
planned in the near future. ra
Wissens
LEE
REFERENCES er
Härtungs
[1] Lynch, S.: “Hydrogen embrittlement phenomena and mechanisms,” Corrosion Die Hari
Reviews, 30, 2012, p. 105 dr
[2] Kao, Y.F., Chen, S.K, Sheu, J. H., Lin, J. T., Lin, W. E. “Hydrogen storage den Elası
properties of multiprincipal-component CoFeMnTixVyZrz alloys.” International Journal Schlifen
of Hydrogen Energy, 35, 2010, p. 9046 insbeson
[3] Kunce, I., Polanski, M., Bystrzycki, J.: “Structure and hydrogen storage properties of a Nach der
high entropy ZrTiVCrFeNi alloy synthesized using Laser Engineered Net Shaping Metallen
(LENS),” International Journal of Hydrogen Energy, 38, 2013, p. 12180 Ter
[4] Kunce, I., Polanski, M., Bystrzycki, J.: “Microstructure and hydrogen storage Taras
properties of a TiZrNbMoV high entropy alloy synthesized using Laser Engineered Röntgen}
Net Shaping (LENS),” International Journal of Hydrogen Energy, 39, 2014, p. 9904
