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

In this study, 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 (Ti 86.5Si 13.5) 97Nb 3 specimens measured an ultimate compressive strength of 1180 MPa and a compressive plastic strain of 12%, both of which are higher than in eutectic Ti 86.5Si 13.5 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 + Ti 5Si 3) matrix. The enhanced ductility is attributed to the morphology of the phase constituents and to the larger lattice mismatches between α-Ti and Ti 5Si 3 phases caused by the Nb addition. The crystallographic orientation relationship of Ti 5Si 3 with α-Ti is ($$1\bar{1}00$$)[$$\overline{11}$$26]Ti 5Si 3∥($$01\bar{1}1$$)[5$$\overline{143}$$] α–Τi.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Shanghai Univ., Shanghai (China)
  2. Changzhou Technician College, Changzhou (People's Republic of China)
  3. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  4. Karlsruher Institut fur Technologie, Karlsruhe (Germany)
Publication Date:
Report Number(s):
IS-J-8895
Journal ID: ISSN 0254-0584; PII: S0254058415302674
Grant/Contract Number:
AC02-07CH11358; 51271107; 13ZZ077
Type:
Accepted Manuscript
Journal Name:
Materials Chemistry and Physics
Additional Journal Information:
Journal Volume: 163; Journal Issue: C; Journal ID: ISSN 0254-0584
Publisher:
Elsevier
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; alloys; electron microscopy; mechanical testing; ductility; microstructure; mechanical properties; titanium alloys
OSTI Identifier:
1235587