{"paper":{"title":"High-Pressure XRD Study of Ti-3Al-2.5V Titanium Alloy: Intermediate Transition Pressure and Composition Trends in Ti-Al-V Alloys","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Adding aluminum and vanadium to titanium raises the pressure required for its high-pressure structural phase transition while leaving bulk modulus unchanged.","cross_cats":["physics.app-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"C. Popescu, D. Errandonea, P. Botella, R. Oliva, R. Turnbull, S. MacLeod","submitted_at":"2026-05-13T15:17:35Z","abstract_excerpt":"High-pressure X-ray diffraction experiments were performed on Ti-Al-V alloys to investigate the effect of composition on structural stability, focusing on Ti-3Al-2.5V and comparing with pure Titanium and Ti-6Al-4V. Measurements using different pressure-transmitting media show a phase transition in Ti-3Al-2.5V at 17-19 GPa, intermediate between pure Ti (5-10 GPa) and Ti-6Al-4V (~30 GPa). Despite variations arising from the choice of pressure medium, the transition pressure shows a clear and systematic increase with higher Al and V content. Equation-of-state analysis indicates that the bulk modu"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"the transition pressure shows a clear and systematic increase with higher Al and V content... Equation-of-state analysis indicates that the bulk modulus remains nearly unchanged across compositions. This suggests a decoupling between elastic properties and phase stability, with alloying primarily affecting the transition pressure rather than compressibility.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"Despite variations arising from the choice of pressure medium, the transition pressure shows a clear and systematic increase with higher Al and V content.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Ti-3Al-2.5V undergoes a high-pressure phase transition at 17-19 GPa that rises systematically with Al and V content, while bulk modulus stays constant across Ti-Al-V compositions.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Adding aluminum and vanadium to titanium raises the pressure required for its high-pressure structural phase transition while leaving bulk modulus unchanged.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"338598b28eaa7ce9988bfae600e477b05d1b472a83dcd8c2287907cf22a3a20a"},"source":{"id":"2605.13658","kind":"arxiv","version":1},"verdict":{"id":"25c03fc7-2b51-4923-997e-4c31faf6f194","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T17:51:59.946310Z","strongest_claim":"the transition pressure shows a clear and systematic increase with higher Al and V content... Equation-of-state analysis indicates that the bulk modulus remains nearly unchanged across compositions. This suggests a decoupling between elastic properties and phase stability, with alloying primarily affecting the transition pressure rather than compressibility.","one_line_summary":"Ti-3Al-2.5V undergoes a high-pressure phase transition at 17-19 GPa that rises systematically with Al and V content, while bulk modulus stays constant across Ti-Al-V compositions.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"Despite variations arising from the choice of pressure medium, the transition pressure shows a clear and systematic increase with higher Al and V content.","pith_extraction_headline":"Adding aluminum and vanadium to titanium raises the pressure required for its high-pressure structural phase transition while leaving bulk modulus unchanged."},"references":{"count":20,"sample":[{"doi":"10.1038/s41467-025-67683-8","year":2026,"title":"Harnessing strengthening-metastability synergy for extreme work hardening in additively manufactured titanium alloys, Nat","work_id":"16ba4399-3a58-4840-9d45-11e0d08054ff","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1016/j.jallcom.2024.174701","year":2024,"title":"Contrasting irradiation behavior of dual phases in Ti-6Al- 4V alloy at low-temperature due to ω-phase precursors in β-phase matrix","work_id":"ed691950-1714-4a83-8c5b-25c1be4586a2","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1016/s0022-3115(02)00888-7","year":2002,"title":"Leguey T, Schäublin R, Marmy P, and Victoria M, Microstructure of Ti5Al2.5Sn and Ti6Al4V deformed in tensile and fatigue tests. J. Nuclear Mat. 2002, 305, 52 -59. DOI: 10.1016/S0022-3115(02)00888-7","work_id":"f781a0b7-9e4f-45b9-a5f0-af729b747864","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3390/met12060986","year":2022,"title":"Metals 2022, 12, 986","work_id":"99421510-e9dd-4cb9-8668-b4dbae02837b","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1016/j.msea.2022.143765","year":2022,"title":"High pressure deformation induced precipitation in Al–Zn–Mg–Cu alloy (Al7075)","work_id":"864cb0a7-d641-4892-b473-01d5efa936c4","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":20,"snapshot_sha256":"cbb4a950ddb27288786bd39208fec25ce6e12537b518ec5a182648050f4533b1","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}