Microstructure and mechanical properties of Tix(AlCrVNb)100-x light weight multi-principal element alloys

X. K. Zhang, J. C. Huang, P. H. Lin, T. Y. Liu, Y. C. Wu, W. P. Li, Y. N. Wang, Y. C. Liao, Jason S.C. Jang

研究成果: 雜誌貢獻期刊論文同行評審

12 引文 斯高帕斯(Scopus)

摘要

The Tix(AlCrVNb)100-x (x = 20, 40, 60 and 80) low-density multi-principal element alloys (MPEAs) were prepared by vacuum arc-melting. The density, crystal structure, microstructure and mechanical properties of this new Tix(AlCrVNb)100-x are reported. The density of alloys decreases with increasing Ti content from 5.81 to 4.79 g/cm3. The microstructure of Ti20 consists of body-centered cubic (BCC) and minor amount of nano-sized particles segregating at grain boundaries, resulting in the brittleness of Ti20. But Ti40, Ti60 and Ti80 all consist of a single BCC solid solution phase. In addition, the experimentally observed phase constitutions are compared with the equilibrium and non-equilibrium thermodynamical modeling results. The compression yield strength decreases from 1122 MPa for Ti40 to 600 MPa for Ti80, due to the decreased atomic size difference. The combination of room-temperatured specific strength and ductility of Ti40 was found to be superior to most single-phase BCC MPEAs in the as-cast state. Promising room-temperature tensile properties were found for Ti60, better than those of most single-phase BCC MPEAs. The solid solution strengthening was found to be the dominant strengthening mechanism, making up more than 90% of the yield strength of Ti40–Ti80.

原文???core.languages.en_GB???
文章編號154742
期刊Journal of Alloys and Compounds
831
DOIs
出版狀態已出版 - 5 8月 2020

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