Densification mechanism of Ti-Al-Nb alloys pressurelessly sintered from Al-Nb master alloy powder for cost-effective manufacturing

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dc.contributor.authorLiu, Xuzhen
dc.contributor.authorWang, Jun
dc.contributor.authorLi, Yanmo
dc.contributor.authorLi, Shukui
dc.contributor.authorCai, Qi
dc.date.accessioned2023-01-09T14:10:07Z
dc.date.available2023-01-09T14:10:07Z
dc.date.issued2022-12-06
dc.description.abstractPressureless sintering is a cost-effective method to fabricate shaped Ti-Al-Nb alloy components in the aerospace industry. However, the sintering pores in the Ti-Al-Nb alloys led to inferior mechanical properties when using elemental Al powder as the raw material. By completely replacing the Al powder with the Al-Nb master alloy powder, the pores were substantially reduced in the pressurelessly sintered Ti-22Al-17.5Nb (at%) alloy, accompanied by the improvement of the tensile strength. We investigated the densification mechanisms by implementing the isothermal quenching experiments at 500–1200 °C. In the Ti/Al/Nb compact, the pores originated from the melting of Al and the Kirkendall effect at the interfaces of the Ti3Al and Nb particles. The transitions of Ti + 3Al → TiAl3 and α2 → B2 determined the porosity of the sintered alloy. In the Ti/Al-Nb/Nb compact, the Kirkendall pores at the Ti/Al3Nb interfaces were reduced since the diffusion of Al in Ti was retarded. The accelerated diffusion of Nb in Ti3Al suppressed the Kirkendall effect at the Nb/Ti3Al interfaces and promoted the formation of the B2 phase. The ripening of the B2 grains further contributed to the densification of the sintered alloy.en_UK
dc.identifier.citationLiu X, Wang J, Li Y, et al., (2023) Densification mechanism of Ti-Al-Nb alloys pressurelessly sintered from Al-Nb master alloy powder for cost-effective manufacturing. Journal of Alloys and Compounds, Volume 936, March 2023, Article number 168307en_UK
dc.identifier.issn0925-8388
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2022.168307
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18913
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectTi-Al-Nb alloyen_UK
dc.subjectPressureless sinteringen_UK
dc.subjectPowder metallurgyen_UK
dc.subjectPhase transitionen_UK
dc.subjectDensificationen_UK
dc.titleDensification mechanism of Ti-Al-Nb alloys pressurelessly sintered from Al-Nb master alloy powder for cost-effective manufacturingen_UK
dc.typeArticleen_UK

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