Microstructure and Vickers hardness of mechanically alloyed and spark plasma sintered Ti-2Zn-22Si-11B and Ti-6Zn-22Si-11B alloys
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2019
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Journal of Alloys and Compounds
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This work reports on effect of zinc and milling time on microstructure and Vickers hardness of mechanically
alloyed and spark plasma sintered (66,7-x)Ti-xZn-22,2Si-11,1B alloys (at.-%, with x ¼ 2 and
6 at.-%). Ball milling at different times (20, 60, 180 and 300 min) was performed under argon atmosphere
in a planetary ball mill from these elemental powder mixtures. Cylinder bodies with 10mm diameter
were consolidated by spark plasma sintering (1100 C, 12 min, 20MPa) under argon atmosphere. Asmilled
powders and sintered Ti-Zn-Si-B samples were evaluated by X-ray diffraction, scanning electron
microscopy, energy dispersive spectrometry, laser diffraction particle size analysis, and Vickers
hardness tests. It was noted a similar behavior during ball milling of Ti-Zn-Si-B powder mixtures. Only
the a-Ti and Si peaks were indexed in XRD patterns of Ti-Zn-Si-B powders milled for 300min. Rietveld
refining indicated that the amount of amorphous structures has increased during milling up to 300 min,
which was more pronounced for the Ti-6Zn-22Si-11B powders. The particle sizes of the Ti-2Zn-22Si-11B
and Ti-6Zn-22Si-11B powder mixtures increased during milling from 94 (20 min) to 156 (300min) mm
and from 101 (20 min) to 136 (300 min) mm, respectively. Coherently, the average specific surface area of
powder particles was continuously reduced during milling. Despite the adopted parameters, the SPS
process produced dense Ti-xZn-22Si-11B (x ¼ 2 and 6 at.-%) alloys with 98% from their theoretical specific
mass. Regardless of milling time, the Ti6Si2B formation was inhibited in microstructure of the spark
plasma sintered Ti-6Zn-22Si-11B alloy previously milled for longer times. EDS analysis indicated that the
Ti6Si2B phase dissolved close to 1.8 at.-% Zn. Beside the TiB and Ti5Si3, the Ti2Zn and Ti3Zn (not explored)
phases were also found in microstructure of sintered Ti-Zn-Si-B alloys. The Ti-2Zn-22Si-11B alloy presented
average Vickers hardness values higher than 1050 HV whereas the Ti-6Zn-22Si-11B alloy varied
between 970 and 1036 HV, which could be associated with the Ti6Si2B formation.
Como referenciar
FERREIRA, NELSON D.; LEAL NETO, RICARDO M.; FILGUEIRA, MARCELLO; FERREIRA, LUCAS M.; ALVES, MANUEL F.R.P.; RAMOS, ERIKA C.T.; NUNES, CARLOS A.; SANTOS, CLAUDINEI dos; RAMOS, ALFEU S. Microstructure and Vickers hardness of mechanically alloyed and spark plasma sintered Ti-2Zn-22Si-11B and Ti-6Zn-22Si-11B alloys. Journal of Alloys and Compounds, v. 794, p. 615-624, 2019. DOI: 10.1016/j.jallcom.2019.04.172. Disponível em: http://repositorio.ipen.br/handle/123456789/30003. Acesso em: 24 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.