skip to main content

SciTech ConnectSciTech Connect

Title: Microstructure and mechanical properties of an ultrafine Ti–Si–Nb alloy

Nb-modified ultrafine Ti–Si eutectic alloy was made by cold crucible levitation melting, tested in compression at room temperature, and characterized by electron microscopy. Compression tests of (Ti86.5Si13.5)97Nb3 specimens measured an ultimate compressive strength of 1180 MPa and a compressive plastic strain of 12%, both of which are higher than in eutectic Ti86.5Si13.5 alloy. Electron microscopy showed that the Ti–Si–Nb alloy had a bimodal microstructure with micrometer-scale primary α-Ti dendrites distributed in an ultrafine eutectic (α-Ti + Ti5Si3) matrix. The enhanced ductility is attributed to the morphology of the phase constituents and to the larger lattice mismatches between α-Ti and Ti5Si3 phases caused by the Nb addition. Furthermore, the crystallographic orientation relationship of Ti5Si3 with α-Ti is ($$1\bar{1}00$$ [$$\overline{11}$$26]Ti5Si3∥($$01\bar{1}1$$)[5$$\overline{143}$$] α–Τi.
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3]
  1. Shanghai Univ., Shanghai (People's Republic of China)
  2. Ames Lab. (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Karlsruher Institut fur Technologie, Karlsruhe (Germany)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0254-0584; PII: S0254058415302674
Grant/Contract Number:
51271107; 13ZZ077; AC02-07CH11358
Accepted Manuscript
Journal Name:
Materials Chemistry and Physics
Additional Journal Information:
Journal Volume: 163; Journal Issue: C; Journal ID: ISSN 0254-0584
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China (NSFC)
Country of Publication:
United States
36 MATERIALS SCIENCE titanium alloys; microstructure; mechanical properties; ductility; electron microscopy