High Temperature Stability of an Al-Zr-Ti Alloy Prepared using Gas Atomization and Spark Plasma Sintering Technology |
| O. Molnárováa, P. Máleka, J. Veselýa, F. Lukáčb, c, T. Chráskac, J. Cinertc
aDepartment of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic bDepartment of Low-Temperature Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic cInstitute of Plasma Physics of the CAS, Prague, Czech Republic |
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| The aim of this study was to prepare an aluminium alloy with high temperature stability using the powder metallurgical route. Gas atomized powder of the Al-Zr-Ti alloy was consolidated by the spark plasma sintering (SPS) technology. The fine grained structure (grain size between 2 and 3μm) observed in the gas atomized powder was retained after sintering both at 425° and 550°. The microhardness of 49 HV observed in the gas atomized powder was increased up to about 100 HV in the SPS compacts. Precipitation of the Al3(Zr,Ti) phase during sintering can explain this strengthening. The materials stability was tested by annealing at temperatures above 450°. The grain size remained stable even after 10 h of annealing. A decrease in microhardness by about 20% can be attributed especially to the formation of the stable modification of the Al3(Zr,Ti) phase. |
DOI:10.12693/APhysPolA.134.876 PACS numbers: 81.05.Bx, 81.20.Ev, 81.40.Cd, 64.75.Op |