{"paper":{"title":"Microstructure evolution during rapid solidification of hypoeutectic Al-Ag alloys near absolute stability","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Concentrated hypoeutectic Al-Ag alloys reach absolute stability at growth rates below 1 m/s.","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alain Karma, Amy J. Clarke, Brian Rodgers, John Roehling, Joseph T. McKeown, Mingwang Zhong, Trevor Lyons","submitted_at":"2026-05-17T18:06:39Z","abstract_excerpt":"Microsegregation-free microstructures can form by solidifying at velocities beyond the absolute stability limit ($V_{\\text{abs}}$), where solute partitioning is suppressed by a stable, planar solid-liquid interface. Producing such microstructures is of considerable practical interest; however, $V_{\\text{abs}}$ typically exceeds the ${\\sim}1$ m/s growth rates encountered in additive manufacturing (AM). Here we demonstrate the absolute stability limit can be reached in sufficiently concentrated hypoeutectic Al-Ag alloys at growth rates well below the 1~m/s typically encountered in additive manuf"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The analysis predicts that V_abs follows a trend similar to that of the miscibility gap, first increasing and then decreasing with Ag concentration. Predicted values of V_abs are in good quantitative agreement with PF simulations over the entire hypoeutectic concentration range and with experiments for three concentrated alloys.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The non-equilibrium, velocity-dependent phase diagram extracted from the phase-field model accurately represents the real thermodynamic and kinetic behavior of the Al-Ag system at the high velocities of interest.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Absolute stability velocity in hypoeutectic Al-Ag alloys first rises then falls with Ag concentration, allowing microsegregation-free planar fronts at velocities below 1 m/s for concentrated compositions.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Concentrated hypoeutectic Al-Ag alloys reach absolute stability at growth rates below 1 m/s.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"7f0154fb5a0ac2d8fc99b807c79b86c9bc2eb3ae96c8dbcd93ca042ae0c69eb4"},"source":{"id":"2605.17576","kind":"arxiv","version":1},"verdict":{"id":"8ca121d9-7dff-4c5d-ae47-a8f334621e60","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T22:24:38.089671Z","strongest_claim":"The analysis predicts that V_abs follows a trend similar to that of the miscibility gap, first increasing and then decreasing with Ag concentration. Predicted values of V_abs are in good quantitative agreement with PF simulations over the entire hypoeutectic concentration range and with experiments for three concentrated alloys.","one_line_summary":"Absolute stability velocity in hypoeutectic Al-Ag alloys first rises then falls with Ag concentration, allowing microsegregation-free planar fronts at velocities below 1 m/s for concentrated compositions.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The non-equilibrium, velocity-dependent phase diagram extracted from the phase-field model accurately represents the real thermodynamic and kinetic behavior of the Al-Ag system at the high velocities of interest.","pith_extraction_headline":"Concentrated hypoeutectic Al-Ag alloys reach absolute stability at growth rates below 1 m/s."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.17576/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T22:31:19.562306Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T22:31:02.597745Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T21:33:23.591363Z","status":"skipped","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T21:21:57.522342Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"945f1a51d02aaee27b678cda59d494bbb491548b22e84b80ec6a59b36253443a"},"references":{"count":57,"sample":[{"doi":"","year":2009,"title":"Rappaz, M. & Dantzig, J. A.Solidification(EPFL Press, 2009)","work_id":"cffe4c14-8b41-4639-9815-a0b1c1ed4e43","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"& Rappaz, M.Fundamentals of solidification(trans tech publications ltd, 2023)","work_id":"b4a19ff7-fb0e-49ba-8eeb-36adcf1dd4e4","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2003,"title":"Trivedi, R., Shen, Y. & Liu, S. Cellular-to-dendritic transition during the directional solidification of binary alloys.Metallurgical and Materials Transactions A34, 395–401 (2003)","work_id":"5beefa69-8630-4d31-ab4a-cd6c3fea38a7","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1997,"title":"Akamatsu, S. & Ihle, T. Similarity law for the tilt angle of dendrites in directional solidification of non-axially-oriented crystals.Physical Review E56, 4479 (1997)","work_id":"b34346ef-1338-41d6-bd94-36e57b852201","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2008,"title":"Deschamps, J., Georgelin, M. & Pocheau, A. Growth directions of microstructures in directional solidification of crystalline materials.Physical Review E—Statistical, Nonlinear, and Soft Matter Physics","work_id":"5c3e323d-9133-48ad-91ae-4c35ab450380","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":57,"snapshot_sha256":"279b431c451127c5a25850bf327c3421b32ff2488997e6322ed42014d26b9745","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"}