Precipitate evolution and thermal stability of A205 fabricated using laser powder bed fusion

被引：9
作者：
Kulkarni, Anup [1 ]
Srinivasan, Dheepa [1 ]
Kumar, Saurabh [1 ,2 ]
Kumar, Praveen [2 ]
Jayaram, Vikram [2 ]
机构：
[1] Pratt & Whitney Res & Dev Ctr, Bangalore 560012, India
[2] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, India
来源：
JOURNAL OF MATERIALS SCIENCE | 2023年 / 58卷 / 05期
关键词：
MG-AG ALLOY; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; OMEGA-PHASE; MICROSTRUCTURAL EVOLUTION; BEHAVIOR; SILVER;
D O I：
10.1007/s10853-023-08163-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The thermal stability of laser power bed fusion A205 was studied via transmission electron microscopy (TEM) following various aging heat treatments. The effects of direct aging at 160 ? and 205 ? were compared with solutionizing and aging. The aging response was evaluated at three different temperatures (170 ?, 190 ?, 205 ?) up to 100 h. Solutionizing above solvus of the alloy at 530 & DEG;C with water quenching, followed by aging at 205 ? for 11 h, gave the optimum combination of high yield strength (376 MPa) and ductility (10%) at room temperature, which was retained up to 150 ? (yield strength of 314 MPa). Detailed TEM analysis coupled with atom probe tomography was used to reveal 20 x 1 nm(2) clusters enriched in Cu and Ag in the As-printed condition, which evolved after aging as nanoscaled, omega (Al-Ag-Cu-Mg) (55 x 7 nm(2)), and theta ' (Al-Cu) (40 x 5 nm(2)) precipitates, having an orientation relationship with alpha-Al, which resisted coarsening and were responsible for the thermal stability during aging up to 200 ? after aging for 100 h.
引用
收藏
页码：2310 / 2333
页数：24
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