Bimodal microstructure in an AlZrTi alloy prepared by mechanical milling and spark plasma sintering

0533709 - FZÚ 2021 RIV CH eng J - Journal Article
Molnárová, Orsolya - Duchoň, Jan - de Prado, Esther - Csáki, Štefan - Průša, F. - Málek, P.
Bimodal microstructure in an AlZrTi alloy prepared by mechanical milling and spark plasma sintering.
Materials. Roč. 13, č. 17 (2020), s. 1-13, č. článku 3756. E-ISSN 1996-1944
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT LM2018110
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271 ; RVO:61389021
Keywords : gas atomization * mechanical milling * spark plasma sintering * microstructure * microhardness
OECD category: Materials engineering; Fluids and plasma physics (including surface physics) (UFP-V)
Impact factor: 3.623, year: 2020
Method of publishing: Open access

The aim of this study was to prepare a low porosity bulk sample with a fine-grained structure from an AlZrTi alloy. Nanostructured powder particles were prepared by mechanical milling of gas atomized powder. The mechanically milled powder was consolidated using spark plasma sintering technology at 475 °C for 6 min using a pressure of 100 MPa. Sintering led to a low porosity sintered sample with a bimodal microstructure. The sintered sample was revealed to be composed of non-recrystallized grains with an approximate size of about 100 nm encompassed by distinct clusters of coarser, micrometer-sized grains. Whereas the larger grains were found to be lean on second phase particles, a high density of second phase particles was found in the areas of fine grains. The microhardness of the milled powder particles was established to be 163 ± 15 HV0.01, which decreased to a slightly lower value of 137 ± 25 HV0.01 after sintering.
Permanent Link: http://hdl.handle.net/11104/0312015