Sun Y.-KChang S.-YTsao L.-CChuang T.-HZhang G.-ZYeh C.-Y.TUNG-HAN CHUANG2022-03-222022-03-22202120763417https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118783197&doi=10.3390%2fapp112110440&partnerID=40&md5=a27434e62b1586f644866c6a77eda0a3https://scholars.lib.ntu.edu.tw/handle/123456789/598473In this study, AA6061/AA6061 and AA6061/alumina were directly brazed with Al10.8Si10Cu, Al10Si10Cu4Ti and Al10Si10Cu4Ti0.1RE filler alloys at 530? C for 10 min without the use of flux. The addition of titanium and rare-earth elements into Al10.8Si10Cu alloy effectively improved the bonding shear strengths of AA6061/AA6061 and AA6061/alumina joints. The highest joint shear strengths were 61.1 and 19.2 MPa, respectively. The Al10.8Si10Cu filler alloy without titanium and rare-earth elements could not wet on the alumina and caused failure of the AA6061/alumina joint. The shear strengths of the AA6061/AA6061 and AA6061/alumina joints both strongly depended on the active element addition. Due to the high chemical activity of the rare-earth elements, they formed AlLa between the Al10Si10Cu4Ti0.1RE filler alloy and alumina. The addition of rare-earth elements into Al10Si10Cu4Ti filler alloy resulted in significant enhancement of the average bond strength of AA6061/alumina joints, from 8.0 to 14.8 MPa. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland.Al-Si-Cu filler metalAluminaAluminum alloyRare-earth elementsTitaniumjournal article10.3390/app1121104402-s2.0-85118783197