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Title: Dynamic environmental embrittlement of an [alpha][sub 2] titanium aluminide. [Ti-25Al-10Nb-3V-1Mo]

Abstract

Titanium aluminide alloys based on the [alpha][sub 2] phase were originally developed to extend the application range of titanium by providing improved elevated temperature strength and environmental resistance. These improvements were to come from the much larger concentrations of aluminum added to make these alloys. It was hoped that the increased amount of aluminum would favor the formation of a continuous, environmentally protective layer of alumina, Al[sub 2]O[sub 3], at the alloy's surface. Tensile and creep testing these alloys at elevated temperatures ([ge][approximately]450 C) in an air environment results in circumferential cracking along the specimen surface. This cracking can lead to premature failure as compared to vacuum testing. Balsone has observed this behavior in Ti-24Al-11Nb tensile tested in air. He repeated the tensile testing in vacuum at 550 C and 650 C, finding that the surface cracking disappeared and that the tensile elongation was significantly increased. From this, Balsone deduced that there was a significant effect of the environment, presumably oxygen embrittlement, on tensile properties at temperatures as low as 550 C. Vacuum tensile testing of Ti-25Al-10Nb-3V-1Mo (Ti-25-10-3-1) also results in a significant improvement in tensile elongation. The intent of the present investigation was to further study the effect ofmore » an air environment at elevated temperature on the tensile elongation of Ti-25-10-3-1. In particular, environmentally assisted surface crack growth into the tensile specimen was of interest.« less

Authors:
 [1];  [2];  [3]
  1. Wright Lab., Wright-Patterson, OH (United States)
  2. Engineering Materials Technology Lab., Cincinnati, OH (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
OSTI Identifier:
6613827
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 28:9; Journal ID: ISSN 0956-716X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; EMBRITTLEMENT; MOLYBDENUM ALLOYS; NIOBIUM ALLOYS; TITANIUM BASE ALLOYS; VANADIUM ALLOYS; AIR; ALLOY SYSTEMS; CRACK PROPAGATION; CREEP; ELONGATION; ENVIRONMENT; EXPERIMENTAL DATA; TENSILE PROPERTIES; ALLOYS; DATA; FLUIDS; GASES; INFORMATION; MECHANICAL PROPERTIES; NUMERICAL DATA; TITANIUM ALLOYS; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Ward, C H, Williams, J C, and Thompson, A W. Dynamic environmental embrittlement of an [alpha][sub 2] titanium aluminide. [Ti-25Al-10Nb-3V-1Mo]. United States: N. p., 1993. Web. doi:10.1016/0956-716X(93)90002-A.
Ward, C H, Williams, J C, & Thompson, A W. Dynamic environmental embrittlement of an [alpha][sub 2] titanium aluminide. [Ti-25Al-10Nb-3V-1Mo]. United States. https://doi.org/10.1016/0956-716X(93)90002-A
Ward, C H, Williams, J C, and Thompson, A W. 1993. "Dynamic environmental embrittlement of an [alpha][sub 2] titanium aluminide. [Ti-25Al-10Nb-3V-1Mo]". United States. https://doi.org/10.1016/0956-716X(93)90002-A.
@article{osti_6613827,
title = {Dynamic environmental embrittlement of an [alpha][sub 2] titanium aluminide. [Ti-25Al-10Nb-3V-1Mo]},
author = {Ward, C H and Williams, J C and Thompson, A W},
abstractNote = {Titanium aluminide alloys based on the [alpha][sub 2] phase were originally developed to extend the application range of titanium by providing improved elevated temperature strength and environmental resistance. These improvements were to come from the much larger concentrations of aluminum added to make these alloys. It was hoped that the increased amount of aluminum would favor the formation of a continuous, environmentally protective layer of alumina, Al[sub 2]O[sub 3], at the alloy's surface. Tensile and creep testing these alloys at elevated temperatures ([ge][approximately]450 C) in an air environment results in circumferential cracking along the specimen surface. This cracking can lead to premature failure as compared to vacuum testing. Balsone has observed this behavior in Ti-24Al-11Nb tensile tested in air. He repeated the tensile testing in vacuum at 550 C and 650 C, finding that the surface cracking disappeared and that the tensile elongation was significantly increased. From this, Balsone deduced that there was a significant effect of the environment, presumably oxygen embrittlement, on tensile properties at temperatures as low as 550 C. Vacuum tensile testing of Ti-25Al-10Nb-3V-1Mo (Ti-25-10-3-1) also results in a significant improvement in tensile elongation. The intent of the present investigation was to further study the effect of an air environment at elevated temperature on the tensile elongation of Ti-25-10-3-1. In particular, environmentally assisted surface crack growth into the tensile specimen was of interest.},
doi = {10.1016/0956-716X(93)90002-A},
url = {https://www.osti.gov/biblio/6613827}, journal = {Scripta Metallurgica et Materialia; (United States)},
issn = {0956-716X},
number = ,
volume = 28:9,
place = {United States},
year = {Sat May 01 00:00:00 EDT 1993},
month = {Sat May 01 00:00:00 EDT 1993}
}