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Title: PARTITION OF SOLUBLE CARBON IN Ti-6Al-4V ALLOY. Period Covered: February 1, 1956 to February 28, 1957

Abstract

The mechanism by which alpha-beta Ti alloys are embrittled by small amounts of interstitial-type solutes such as N, O, and C can not be fully understood until more is known of the microdistribution of these dissolved impurities in the two-phase alloys. This report describes the results of an investigation of possible means for determining the micro-distribution of these impurities, particularly in the more complex alloys. A useful method was developed for measuring microdistribution of solutes in alloys. This method was completely independert of the presence of other solute elements, whether interstitial or substitutional. In addition, some information is presented regarding the use of microautoradiographic techniques to study the microdistribution of the interstitial type solutes in two-phase Ti alloys. (auth)

Authors:
; ;
Publication Date:
Research Org.:
Denver. Univ. Denver Research Inst.
OSTI Identifier:
4317858
Report Number(s):
WADC-TR-57-269; AD-142137
NSA Number:
NSA-12-003698
DOE Contract Number:
AF-33(616)-3349
Resource Type:
Technical Report
Resource Relation:
Other Information: Project title: METALLIC MATERIALS. Task title: TITANIUM METAL AND ALLOYS. Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
MINERALOGY, METALLURGY, AND CERAMICS; BRITTLENESS; CARBON; DISTRIBUTION; GRAIN BOUNDARIES; IMPURITIES; MEASURED VALUES; MICROSCOPY; NITROGEN; OXYGEN; PHASE DIAGRAMS; RADIOGRAPHY; REACTION KINETICS; SOLUBILITY; TITANIUM

Citation Formats

Seibel, R.D., Beck, R.L., and Olds, L.E. PARTITION OF SOLUBLE CARBON IN Ti-6Al-4V ALLOY. Period Covered: February 1, 1956 to February 28, 1957. United States: N. p., 1957. Web.
Seibel, R.D., Beck, R.L., & Olds, L.E. PARTITION OF SOLUBLE CARBON IN Ti-6Al-4V ALLOY. Period Covered: February 1, 1956 to February 28, 1957. United States.
Seibel, R.D., Beck, R.L., and Olds, L.E. Mon . "PARTITION OF SOLUBLE CARBON IN Ti-6Al-4V ALLOY. Period Covered: February 1, 1956 to February 28, 1957". United States. doi:.
@article{osti_4317858,
title = {PARTITION OF SOLUBLE CARBON IN Ti-6Al-4V ALLOY. Period Covered: February 1, 1956 to February 28, 1957},
author = {Seibel, R.D. and Beck, R.L. and Olds, L.E.},
abstractNote = {The mechanism by which alpha-beta Ti alloys are embrittled by small amounts of interstitial-type solutes such as N, O, and C can not be fully understood until more is known of the microdistribution of these dissolved impurities in the two-phase alloys. This report describes the results of an investigation of possible means for determining the micro-distribution of these impurities, particularly in the more complex alloys. A useful method was developed for measuring microdistribution of solutes in alloys. This method was completely independert of the presence of other solute elements, whether interstitial or substitutional. In addition, some information is presented regarding the use of microautoradiographic techniques to study the microdistribution of the interstitial type solutes in two-phase Ti alloys. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 15 00:00:00 EDT 1957},
month = {Mon Jul 15 00:00:00 EDT 1957}
}

Technical Report:
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  • S>An investigation of the microdistribution of interstitial elements in Ti and Ti binary alloys end its effect on the mechanical properties was initiated. The experimental techniques which were utilized during this period were internal friction measurements and ''hard'' tensile testing. A study of the solute atom- dislocation interaction of Ti-O alloys was performed. It was foumd that the behavior of the phenomenon was in accord with the relatlonship C = Coexp (V/KT). The interaction energy between an O atom and a dislocation was calculated to be 0.015 ev. The O content required to saturate the dislocatlons was found to bemore » approximately 1.5%. It was also observed that the transit tion from ductile to brittle behavior occurred at the same composition. It was suggested that the transition phenomenon was due to the adsorption of O atoms at the dislocations. In view of this suggestion it was possible to predict the proper treatment to shift the onset of the embrittling effect to higher 0 contents. This was demonstrated experimentally and it was possible to increase the ductility of Ti-O alloys. It was demonstrated that an interstitial stress relaxation phenomenon could be observed in ''superpurity'' Ti. The development of the interstitial peak in alpha Ti is shown to be directly related to the atomic size of the substitutional element in solutlon with the O. The greater the difference in size factor between the solute and the Ti atom, the greater the enhancement of the ''interstitial'' peak. It is suggested that the mechanism whereby the substitutional solute atoms enhance the appearance of the interstital peak is as follows: The out-of-size substitational atom causes a localized distortion of the lattice which effectively destroys the isotropic nature of the octahedral interstitial sites. Hence, one site becomes energetically favorable to another upon the application of an external stress. This causes a stress-induced interstitial relaxation phenomenon which is manifested by the appearance of an internal friction peak. (auth)« less
  • In order to establish design criteria on the 6A1--4V titanium alloy, tensile, compressive, bearing, and shear properties have been determined on both bar and sheet material at temperatures from 75 to 1000 deg F. In addition, tensile properties of sheet material were determined after 100-hour exposure at 600, 800, and 1000 deg F. Test results were compared with recently established minimum requirements for tensile strength in order to derive design values for compression, bearing, and shear. Other properties investigated include minimum bend radius for 105 deg bend and notched tensile strength at temperatures from 75 to 1000 deg F, andmore » torsional properties at room temperature. Axial load fatigue characteristics were investigated at temperatures from 75 to 1000 deg F for both smooth and notched specimens at stress ratios of 0 (stress-rupture), 0.3, 1.0, and infinity. Descriptions of the test specimens, equipment, and procedures used are included. Test results are reported in tables and in curves showing the effect of temperature on the various mechanical properties. (auth)« less
  • An investigation was undertaken to observe the influence of heat treatment on stability of a Ti--Al-- Mo ternary alloy. Tests show that the instability of the alloy is innocuous, and that transformation during testing helps to maintain the material strength. The creep resistance of the alloy was improvcd by heat treatment, and the stressrupture properties were not deteriorated. A mechanism of embrittlement by heat treatment is discussed. (auth)