{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,11]],"date-time":"2026-10-11T02:53:12Z","timestamp":1791687192213,"version":"4.3.4"},"reference-count":67,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T00:00:00Z","timestamp":1765497600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"US Army International Technology Center, Indo-Pacific (ITC-IPAC), Tokyo","award":["FA520923C0010"],"award-info":[{"award-number":["FA520923C0010"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>This paper is the first to reveal that the conventionally built aluminium alloy (AA) 7085-T7452 has mechanical properties, viz: a yield stress, ultimate strength, and an elongation to failure, that are similar to that of laser powder bed fusion (LPBF) built Scalmalloy\u00ae. Following this observation, the growth of cracks that nucleated from corrosion pits in AA7085-T7452 specimens that had been exposed to a 5 wt% NaCl salt fog environment at 35 \u00b0C according to ASTM B117-19 standard for fourteen days is then studied. The specimen geometries were chosen to be identical to those associated with a similar study on Boeing Space, Intelligence, and Weapon Systems (BSI&amp;WS) LPBF built Scalmalloy\u00ae. This level of prior exposure led to pits in AA7085-T7452 that were approximately 0.5 mm deep with a surface width\/diameter of up to approximately 1.5 mm. These pit sizes are broadly consistent with those leading to fatigue crack growth (FCG) in AA 7050-T7451 structural parts on the RAAF F\/A-18 Classic Hornet fleet operating in a highly corrosive environment. Fatigue tests on these AA7085-T7452 specimens, under the same spectrum as used in the BSI&amp;WS LPBF Scalmalloy\u00ae study, reveals that AA7085-T7452 and Scalmalloy\u00ae have similar crack growth histories. This, in turn, leads to the discovery that the growth of naturally occurring three-dimensional (3D) cracks in AA 7085-T7452 could be predicted using the crack growth equation developed for BSI&amp;WS LPBF Scalmalloy\u00ae, albeit with allowance made for their different fracture toughness\u2019s. These findings suggest that Scalmalloy\u00ae may be suitable for printing parts for both current and future attritable aircraft.<\/jats:p>","DOI":"10.3390\/ma18245586","type":"journal-article","created":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T12:52:31Z","timestamp":1765543951000},"page":"5586","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A Comparison Between the Growth of Naturally Occurring Three-Dimensional Cracks in Scalmalloy\u00ae and Pre-Corroded 7085-T7452 and Its Implications for Additively Manufactured Limited-Life Replacement Parts"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4586-7268","authenticated-orcid":false,"given":"Daren","family":"Peng","sequence":"first","affiliation":[{"name":"ARC Industrial Transformation Training Centre on Surface Engineering for Advanced Materials, School of Engineering, Swinburne University of Technology, John Street, Melbourne, VIC 3122, Australia"},{"name":"Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6677-2906","authenticated-orcid":false,"given":"Shareen S. L.","family":"Chan","sequence":"additional","affiliation":[{"name":"ARC Industrial Transformation Training Centre on Surface Engineering for Advanced Materials, School of Engineering, Swinburne University of Technology, John Street, Melbourne, VIC 3122, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5819-1653","authenticated-orcid":false,"given":"Ben","family":"Main","sequence":"additional","affiliation":[{"name":"Defence Science and Technology Group, 506 Lorimer Street, Melbourne, VIC 3207, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7664-9971","authenticated-orcid":false,"given":"Andrew S. M.","family":"Ang","sequence":"additional","affiliation":[{"name":"ARC Industrial Transformation Training Centre on Surface Engineering for Advanced Materials, School of Engineering, Swinburne University of Technology, John Street, Melbourne, VIC 3122, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nam","family":"Phan","sequence":"additional","affiliation":[{"name":"Structures Division, Naval Air Systems Command, Patuxent River, MD 20670, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael R.","family":"Brindza","sequence":"additional","affiliation":[{"name":"Air Warfare & Weapons Department\/Air Platforms Division, Office of Naval Research, Arlington, VA 22217, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3197-2796","authenticated-orcid":false,"given":"Rhys","family":"Jones","sequence":"additional","affiliation":[{"name":"ARC Industrial Transformation Training Centre on Surface Engineering for Advanced Materials, School of Engineering, Swinburne University of Technology, John Street, Melbourne, VIC 3122, Australia"},{"name":"Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"106704","DOI":"10.1016\/j.ijfatigue.2021.106704","article-title":"On small fatigue crack growth rates in AA7085-T7452","volume":"156","author":"Main","year":"2022","journal-title":"Int. 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