{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/40973"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/40973","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature","abstract":"Constant stress creep tests were performed in vacuo on alpha titanium in various thermomechanical treatments. At 500°C and 527°C annealed alpha titanium exhibits an anomalous creep arrest in the initial portion of the creep curve. After this creep arrest the creep curves swept up to a true steady state creep rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is attributed to even distribution of interstitials on the recovered dislocation substructure making dynamic strain aging less effective. Additionally, transmission electron microscopy indicates that the tilt boundaries of the recovery structure can break down during the initial portion of the creep curve releasing mobile dislocations. In steady state all conditions tested developed a dislocation subgrain substructure. The tendency for dislocation subboundaries to inhabit specific planes is not as marked as it is in the recovered structure.","abstract_html":"Constant stress creep tests were performed in vacuo on alpha titanium in various thermomechanical treatments. At 500°C and 527°C annealed alpha titanium exhibits an anomalous creep arrest in the initial portion of the creep curve. After this creep arrest the creep curves swept up to a true steady state creep rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is attributed to even distribution of interstitials on the recovered dislocation substructure making dynamic strain aging less effective. Additionally, transmission electron microscopy indicates that the tilt boundaries of the recovery structure can break down during the initial portion of the creep curve releasing mobile dislocations. In steady state all conditions tested developed a dislocation subgrain substructure. The tendency for dislocation subboundaries to inhabit specific planes is not as marked as it is in the recovered structure.","abstract_has_math":false,"creators":["Somers, Bruce Robert, 1947-"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Materials Engineering","degree_department":"Materials Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Lytton, Jack L."],"committee_members":["Spencer, Chester W.","Houska, Charles R."],"year":1976,"date_issued":"1976-08-15","date_published":"1976-08-15","updated_at":"2026-07-22T22:18:42Z","subjects":["annealed alpha titanium"],"languages":[],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-02072013-040041"],"render_values":[{"text":"etd-02072013-040041","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/40973","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Lytton, Jack L."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Spencer, Chester W.","Houska, Charles R."]},{"key":"dc:contributor.department","label":"Department","values":["Materials Engineering"]},{"key":"dc:creator","label":"Author","values":["Somers, Bruce Robert, 1947-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:28:47Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:28:47Z","2013-02-07"]},{"key":"dc:date.issued","label":"Date","values":["1976-08-15"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["annealed alpha titanium"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-02072013-040041"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/40973"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Constant stress creep tests were performed in vacuo on alpha titanium in various thermomechanical treatments. At 500°C and 527°C annealed alpha titanium exhibits an anomalous creep arrest in the initial portion of the creep curve. After this creep arrest the creep curves swept up to a true steady state creep rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is attributed to even distribution of interstitials on the recovered dislocation substructure making dynamic strain aging less effective. Additionally, transmission electron microscopy indicates that the tilt boundaries of the recovery structure can break down during the initial portion of the creep curve releasing mobile dislocations. In steady state all conditions tested developed a dislocation subgrain substructure. The tendency for dislocation subboundaries to inhabit specific planes is not as marked as it is in the recovered structure."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Lytton, Jack L."],"dc:contributor.committeemember":["Spencer, Chester W.","Houska, Charles R."],"dc:contributor.department":["Materials Engineering"],"dc:creator":["Somers, Bruce Robert, 1947-"],"dc:date.accessioned":["2014-03-14T21:28:47Z"],"dc:date.available":["2014-03-14T21:28:47Z","2013-02-07"],"dc:date.issued":["1976-08-15"],"dc:description.abstract":["Constant stress creep tests were performed in vacuo on alpha titanium in various thermomechanical treatments. At 500°C and 527°C annealed alpha titanium exhibits an anomalous creep arrest in the initial portion of the creep curve. After this creep arrest the creep curves swept up to a true steady state creep rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is attributed to even distribution of interstitials on the recovered dislocation substructure making dynamic strain aging less effective. Additionally, transmission electron microscopy indicates that the tilt boundaries of the recovery structure can break down during the initial portion of the creep curve releasing mobile dislocations. In steady state all conditions tested developed a dislocation subgrain substructure. The tendency for dislocation subboundaries to inhabit specific planes is not as marked as it is in the recovered structure."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-02072013-040041"],"dc:identifier.uri":["http://hdl.handle.net/10919/40973"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["annealed alpha titanium"],"dc:title":["Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Materials Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:18:42Z"}