High-strength bimodal ultrafine Ti-based alloys with enhanced ductility

作者：Cao, G. H.^*; Zhou, Y. N.; Liu, N.; Li, X.; Russell, A. M.; Gerthsen, D.

来源：CRYSTAL RESEARCH AND TECHNOLOGY, 2014, 49(5): 338-344.

DOI：10.1002/crat.201400035

• Ti-based alloys
• hypereutectics
• mechanical properties
• microstructure
• electron microscopy

Bulk Ti65Fe35 and (Ti65Fe35)(96.15-x)Sn3.85Nbx (x = 0, 3, 5 and 7 at.%) alloys were prepared by cold crucible levitation melting, and tested in compression at room temperature. The Sn and Nb modified hypereutectic Ti-Fe alloys exhibited improved mechanical properties under compression. (Ti65Fe35)(93.15)Sn3.85Nb3 alloy displayed an ultimate compressive strength of 2.7 GPa and a compressive plastic strain of 15%. Electron microscope observations revealed Ti-Fe(Sn,Nb) alloys having a bimodal microstructure with micrometer-scale primary TiFe dendrites distributed in an ultrafine eutectic (-Ti+TiFe) matrix. The orientation relationship of -Ti with TiFe phases is TiFe (011)[100] vertical bar -Ti (011)[100]. The improved mechanical properties are attributed to the morphology of the phase constituents and the larger lattice mismatches between -Ti and TiFe phases due to the additions of Sn and Nb.

• 出版日期2014-5
• 单位上海大学