Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu-Fe alloys

被引：38
作者：
Chatterjee, Arya [1 ]
Sprague, Ethan [1 ]
Mazumder, Jyoti [1 ,2 ]
Misra, Amit [1 ,2 ]
机构：
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 802卷
关键词：
Cu-Fe alloys; Additive manufacturing; Laser direct-metal-deposition; Hierarchical microstructure; BCC Cu; FCC Fe precipitation; Micropillar compression; MAGNETIC-PROPERTIES; MARTENSITIC-TRANSFORMATION; GRAIN-REFINEMENT; SOLID-SOLUTIONS; PRECIPITATION; MODEL; RESOLUTION; BCC;
D O I：
10.1016/j.msea.2020.140659
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Cu25Fe75 and Cu50Fe50 (nominal composition, at. %) alloys were fabricated using laser direct metal deposition (DMD) based additive manufacturing technique. These alloys exhibit hierarchical microstructures with bi-phasic Cu and Fe dendrites that contain nanoscale precipitates of varying sizes and structures. In the Cu25Fe75 alloy, Fe dendrites contained nanoscale, coherent, metastable BCC Cu and semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale, coherent, metastable FCC Fe precipitates. In the Cu50Fe50 alloy, Fe dendrites only contained nanoscale semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale coherent metastable FCC Fe precipitates. Both alloys exhibited enhanced flow strengths in the range of 750-980 MPa and significant plasticity, in compression. The Cu25Fe75 alloy had lower yield strength than Cu50Fe50 alloy but higher maximum compressive strength due to higher strain hardening resulting from slightly coarser dendrites with hierarchy of nanoscale precipitation.
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页数：14
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