I. Liu , J. Hoarston , N. Zhu , A. Birt , N. Palya , B.J. Phillips , D.Z. Avery , P.G. Allison , J.B. Jordon
{"title":"Influence of aging time to achieve tensile build direction heat treated T74 forging properties in lubricant free AFSD AA7050","authors":"I. Liu , J. Hoarston , N. Zhu , A. Birt , N. Palya , B.J. Phillips , D.Z. Avery , P.G. Allison , J.B. Jordon","doi":"10.1016/j.addlet.2025.100296","DOIUrl":null,"url":null,"abstract":"<div><div>The need for long-lead time aluminum alloy casting and forging replacements requires innovative solutions such as Additive Friction Stir Deposition (AFSD), a solid-state additive manufacturing technique that uses frictional heat and severe plastic deformation to create metallurgical bonds through layer-by-layer deposition. While AFSD has demonstrated isotropic mechanical properties in the as-deposited condition, post-deposition heat treatment (PDHT) of precipitation hardened aluminum alloys processed by AFSD has led to poor ductility, particularly in the build direction. In this feasibility study, a lubricant-free twin rod AFSD (TR-AFSD) approach printed a 100 millimeter tall AA7050 build. Mechanical properties in the build direction were determined for a range of artificial aging times. Experimental results showed that a one hour aging time following a 24-hour solution treatment produced tensile yield, ultimate tensile strength, and strain to failure results of 360 ± 5.5 MPa, 463 ± 10.3 MPa, and 7.55 ± 2.00 %, respectively. Our feasibility study shows that forging-like tensile properties can be achieved in the build direction from TR-AFSD prints using a featureless tool coupled with a temperature control lubricant-free round feedstock approach and a custom PDHT schedule.</div></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"14 ","pages":"Article 100296"},"PeriodicalIF":4.2000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Additive manufacturing letters","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772369025000301","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MANUFACTURING","Score":null,"Total":0}
引用次数: 0
Abstract
The need for long-lead time aluminum alloy casting and forging replacements requires innovative solutions such as Additive Friction Stir Deposition (AFSD), a solid-state additive manufacturing technique that uses frictional heat and severe plastic deformation to create metallurgical bonds through layer-by-layer deposition. While AFSD has demonstrated isotropic mechanical properties in the as-deposited condition, post-deposition heat treatment (PDHT) of precipitation hardened aluminum alloys processed by AFSD has led to poor ductility, particularly in the build direction. In this feasibility study, a lubricant-free twin rod AFSD (TR-AFSD) approach printed a 100 millimeter tall AA7050 build. Mechanical properties in the build direction were determined for a range of artificial aging times. Experimental results showed that a one hour aging time following a 24-hour solution treatment produced tensile yield, ultimate tensile strength, and strain to failure results of 360 ± 5.5 MPa, 463 ± 10.3 MPa, and 7.55 ± 2.00 %, respectively. Our feasibility study shows that forging-like tensile properties can be achieved in the build direction from TR-AFSD prints using a featureless tool coupled with a temperature control lubricant-free round feedstock approach and a custom PDHT schedule.