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The role of intermetallic precipitates in Ti-62222S

Abstract

Samples of Ti-62222-0.23wt.%Si were heat treated and aged at temperatures ranging from 1150 F to 1500 F with the view of effecting selective precipitation of {alpha}{sub 2} precipitates and silicides (i.e. Ti{sub x}Zr{sub 5-x}Si{sub 3}). The effect of these intermetallic precipitates on the mechanical properties and fracture morphology was assessed via three separate microstructural conditions: Ti-62222S with {alpha}{sub 2} precipitates, Ti-62222S with {alpha}{sub 2} and silicide precipitates, and Ti-62222S with silicide precipitates. Both types of intermetallic precipitate appear to lower the fracture toughness, however {alpha}{sub 2} promotes intergranular fracture while silicides lead to transgranular failure and dimpling. The combined presence of the {alpha}{sub 2} and silicides leads to mixed mode failure. Further, since {alpha}{sub 2} is present in the {alpha} phase and silicides precipitate out in the {beta} phase, it appears that the effect of each of these intermetallics in Ti-62222S is additive rather than synergistic. (orig.)
Authors:
Evans, D J; [1]  Broderick, T F; [1]  Woodhouse, J B; [2]  Hoenigman, J R [3] 
  1. US Air Force Mater. Directorate Wright Lab., Wright Patterson AFB, OH (United States)
  2. UES Inc, Dayton, OH (United States)
  3. Wright State Univ., Dayton, OH (United States). Research Inst.
Publication Date:
Aug 15, 1996
Product Type:
Journal Article
Report Number:
CONF-9509424-
Reference Number:
SCA: 360102; 360103; PA: CHF-97:0G1139; EDB-97:014720; SN: 97001722648
Resource Relation:
Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing; Journal Volume: 213; Journal Issue: 1-2; Conference: 2. international symposium on metallurgy and technology of titanium alloys, Tokyo (Japan), 25-28 Sep 1995; Other Information: PBD: 15 Aug 1996
Subject:
36 MATERIALS SCIENCE; TITANIUM ALLOYS; PRECIPITATION; INTERMETALLIC COMPOUNDS; ALUMINIUM ALLOYS; TIN ALLOYS; ZIRCONIUM ALLOYS; MOLYBDENUM ALLOYS; CHROMIUM ALLOYS; SILICON ALLOYS; FRACTURE PROPERTIES; GRAIN BOUNDARIES; HEAT TREATMENTS; MECHANICAL PROPERTIES; MICROSTRUCTURE; MORPHOLOGY; TEMPERATURE DEPENDENCE
OSTI ID:
418293
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Journal ID: MSAPE3; ISSN 0921-5093; TRN: CH97G1139
Submitting Site:
CHF
Size:
pp. 37-44
Announcement Date:

Citation Formats

Evans, D J, Broderick, T F, Woodhouse, J B, and Hoenigman, J R. The role of intermetallic precipitates in Ti-62222S. Switzerland: N. p., 1996. Web. doi:10.1016/0921-5093(96)10231-8.
Evans, D J, Broderick, T F, Woodhouse, J B, & Hoenigman, J R. The role of intermetallic precipitates in Ti-62222S. Switzerland. doi:10.1016/0921-5093(96)10231-8.
Evans, D J, Broderick, T F, Woodhouse, J B, and Hoenigman, J R. 1996. "The role of intermetallic precipitates in Ti-62222S." Switzerland. doi:10.1016/0921-5093(96)10231-8. https://www.osti.gov/servlets/purl/10.1016/0921-5093(96)10231-8.
@misc{etde_418293,
title = {The role of intermetallic precipitates in Ti-62222S}
author = {Evans, D J, Broderick, T F, Woodhouse, J B, and Hoenigman, J R}
abstractNote = {Samples of Ti-62222-0.23wt.%Si were heat treated and aged at temperatures ranging from 1150 F to 1500 F with the view of effecting selective precipitation of {alpha}{sub 2} precipitates and silicides (i.e. Ti{sub x}Zr{sub 5-x}Si{sub 3}). The effect of these intermetallic precipitates on the mechanical properties and fracture morphology was assessed via three separate microstructural conditions: Ti-62222S with {alpha}{sub 2} precipitates, Ti-62222S with {alpha}{sub 2} and silicide precipitates, and Ti-62222S with silicide precipitates. Both types of intermetallic precipitate appear to lower the fracture toughness, however {alpha}{sub 2} promotes intergranular fracture while silicides lead to transgranular failure and dimpling. The combined presence of the {alpha}{sub 2} and silicides leads to mixed mode failure. Further, since {alpha}{sub 2} is present in the {alpha} phase and silicides precipitate out in the {beta} phase, it appears that the effect of each of these intermetallics in Ti-62222S is additive rather than synergistic. (orig.)}
doi = {10.1016/0921-5093(96)10231-8}
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing}
issue = {1-2}
volume = {213}
journal type = {AC}
place = {Switzerland}
year = {1996}
month = {Aug}
}