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Title: Processing and properties of Nb-Ti-base alloys

Abstract

The processing characteristics, tensile properties, and oxidation response of two Nb-Ti-Al-Cr alloys were investigated. One creep test at 650 C and 172 MPa was conducted on the base alloy, which contained 40Nb-40Ti-10Al-10Cr. A second alloy was modified with 0.11 at.% C and 0.07 at.% Y. Alloys were arc melted in a chamber backfilled with argon, drop cast into a water-cooled copper mold, and cold rolled to obtain a 0.8-mm sheet. The sheet was annealed at 1,100 C for 0.5 h. Longitudinal tensile specimens and oxidation specimens were obtained for both the base alloy and the modified alloy. Tensile properties were obtained for the base alloy at room temperature, 400, 600, 700, 800, 900, and 1,000 C and for the modified alloy at room temperature, 400, 600, 700, and 800 C. Oxidation tests the base alloy and modified alloy, as measured by weight change, were carried out at 600, 700, 800, and 900 C. Both the base alloy and the modified alloy were extremely ductile and were cold rolled to the final sheet thickness of 0.8 mm without an intermediate anneal. The modified alloy exhibit some edge cracking during cold rolling. Both alloys recrystallized at the end of a 0.5-h annealingmore » treatment. The alloys exhibited moderate strength and oxidation resistance below 600 C, similar to the results of alloys reported in the literature. The addition of carbon produced almost no change in either the yield strength or ductility as measured by total elongation. A small increase in the ultimate tensile strength and a corresponding decrease in the reduction of area below 600 C were observed. Carbon addition also served to marginally refine the grain size after annealing. The results of this study and those of similar alloys reported in the literature suggest that 40Nb-40Ti-10Al-10Cr forms a good base alloy suitable for alloying for improvement in its oxidation and high-temperature strength properties.« less

Authors:
;  [1];  [2]
  1. Oak Ridge National Lab., TN (United States)
  2. Niobium Products Co., Inc., Coraopolis, PA (United States)
Publication Date:
OSTI Identifier:
5363600
Resource Type:
Journal Article
Journal Name:
Journal of Materials Engineering and Performance; (United States)
Additional Journal Information:
Journal Volume: 2:4; Journal ID: ISSN 1059-9495
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; FABRICATION; MECHANICAL PROPERTIES; OXIDATION; CARBON; METALLURGICAL EFFECTS; CHROMIUM ALLOYS; NIOBIUM ALLOYS; TITANIUM ALLOYS; YTTRIUM; ALLOY SYSTEMS; CARBON ADDITIONS; EXPERIMENTAL DATA; HEAT RESISTING ALLOYS; YTTRIUM ADDITIONS; ALLOYS; CHEMICAL REACTIONS; DATA; ELEMENTS; HEAT RESISTANT MATERIALS; INFORMATION; MATERIALS; METALS; NONMETALS; NUMERICAL DATA; TRANSITION ELEMENTS; YTTRIUM ALLOYS; 360101* - Metals & Alloys- Preparation & Fabrication; 360103 - Metals & Alloys- Mechanical Properties; 360105 - Metals & Alloys- Corrosion & Erosion

Citation Formats

Sikka, V K, Viswanathan, S, and Loria, E A. Processing and properties of Nb-Ti-base alloys. United States: N. p., 1993. Web. doi:10.1007/BF02661733.
Sikka, V K, Viswanathan, S, & Loria, E A. Processing and properties of Nb-Ti-base alloys. United States. doi:10.1007/BF02661733.
Sikka, V K, Viswanathan, S, and Loria, E A. Sun . "Processing and properties of Nb-Ti-base alloys". United States. doi:10.1007/BF02661733.
@article{osti_5363600,
title = {Processing and properties of Nb-Ti-base alloys},
author = {Sikka, V K and Viswanathan, S and Loria, E A},
abstractNote = {The processing characteristics, tensile properties, and oxidation response of two Nb-Ti-Al-Cr alloys were investigated. One creep test at 650 C and 172 MPa was conducted on the base alloy, which contained 40Nb-40Ti-10Al-10Cr. A second alloy was modified with 0.11 at.% C and 0.07 at.% Y. Alloys were arc melted in a chamber backfilled with argon, drop cast into a water-cooled copper mold, and cold rolled to obtain a 0.8-mm sheet. The sheet was annealed at 1,100 C for 0.5 h. Longitudinal tensile specimens and oxidation specimens were obtained for both the base alloy and the modified alloy. Tensile properties were obtained for the base alloy at room temperature, 400, 600, 700, 800, 900, and 1,000 C and for the modified alloy at room temperature, 400, 600, 700, and 800 C. Oxidation tests the base alloy and modified alloy, as measured by weight change, were carried out at 600, 700, 800, and 900 C. Both the base alloy and the modified alloy were extremely ductile and were cold rolled to the final sheet thickness of 0.8 mm without an intermediate anneal. The modified alloy exhibit some edge cracking during cold rolling. Both alloys recrystallized at the end of a 0.5-h annealing treatment. The alloys exhibited moderate strength and oxidation resistance below 600 C, similar to the results of alloys reported in the literature. The addition of carbon produced almost no change in either the yield strength or ductility as measured by total elongation. A small increase in the ultimate tensile strength and a corresponding decrease in the reduction of area below 600 C were observed. Carbon addition also served to marginally refine the grain size after annealing. The results of this study and those of similar alloys reported in the literature suggest that 40Nb-40Ti-10Al-10Cr forms a good base alloy suitable for alloying for improvement in its oxidation and high-temperature strength properties.},
doi = {10.1007/BF02661733},
journal = {Journal of Materials Engineering and Performance; (United States)},
issn = {1059-9495},
number = ,
volume = 2:4,
place = {United States},
year = {1993},
month = {8}
}