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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
Alternate Identifier(s):
OSTI ID: 1425690

Cao, G. H., Jian, G. Y., Liu, N., Zhang, W. H., Russell, A. M., and Gerthsen, D.. Microstructure and mechanical properties of an ultrafine Ti–Si–Nb alloy. United States: N. p., Web. doi:10.1016/j.matchemphys.2015.08.007.
Cao, G. H., Jian, G. Y., Liu, N., Zhang, W. H., Russell, A. M., & Gerthsen, D.. Microstructure and mechanical properties of an ultrafine Ti–Si–Nb alloy. United States. doi:10.1016/j.matchemphys.2015.08.007.
Cao, G. H., Jian, G. Y., Liu, N., Zhang, W. H., Russell, A. M., and Gerthsen, D.. 2015. "Microstructure and mechanical properties of an ultrafine Ti–Si–Nb alloy". United States. doi:10.1016/j.matchemphys.2015.08.007. https://www.osti.gov/servlets/purl/1235587.
@article{osti_1235587,
title = {Microstructure and mechanical properties of an ultrafine Ti–Si–Nb alloy},
author = {Cao, G. H. and Jian, G. Y. and Liu, N. and Zhang, W. H. and Russell, A. M. and Gerthsen, D.},
abstractNote = {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 (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. 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.},
doi = {10.1016/j.matchemphys.2015.08.007},
journal = {Materials Chemistry and Physics},
number = C,
volume = 163,
place = {United States},
year = {2015},
month = {8}
}