Formation mechanisms of Sn-rich δ phase and its role in strengthening Cu-10Sn manufactured by laser powder bed fusion

被引:0
|
作者
Chen, Kangwei [1 ,2 ]
Lim, Bryan [3 ]
Zhang, Leon [1 ,2 ]
Koo, Boon Xuan [1 ,2 ]
Ringer, Simon P. [1 ,2 ]
Nomoto, Keita [1 ,2 ]
机构
[1] Univ Sydney, Australian Ctr Microscopy & Microanal, Camperdown, NSW 2006, Australia
[2] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Camperdown, NSW 2006, Australia
[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Knoxville, TN 37830 USA
基金
澳大利亚研究理事会;
关键词
Laser powder bed fusion; Cu-10Sn alloy; Microstructure; Phase transformation; Strengthening mechanisms; CU-SN; MICROSTRUCTURAL EVOLUTION; WEAR-RESISTANCE; PART I; ALLOY; CAST;
D O I
10.1016/j.addma.2025.104723
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Cu-Sn alloys produced via laser powder bed fusion (L-PBF) additive manufacturing (AM) have gained significant attention because they combine the advantages of AM relevant to intricate component design with outstanding combinations of strength, ductility, and resistance to wear and corrosion. However, a detailed understanding of the microstructure that contributes to the enhancement of the mechanical properties of L-PBF Cu-10Sn alloys remains unclear. In particular, there is a lack of understanding of the formation mechanisms of the Sn-rich delta phase commonly observed in Cu-10Sn. This study reveals two distinct variants of the delta phase possessing unique morphological characteristics. These characteristics are attributed to the local solidification conditions inherent to the melt pool boundaries versus those at the interiors of melt pools. A phase transformation pathway that elucidates the origin of the morphological variants of the delta phase from the Sn-rich metastable phases during the cyclic heating of the AM process is proposed. We report superior mechanical properties in L-PBF Cu-10Sn compared to those of conventionally manufactured counterparts due to the synergistic contributions from grain boundaries, dislocations, and the delta phase. Notably, the delta phase alone contributes approximately 22 % to the overall strength observed in the L-PBF Cu-10Sn alloy. The discovery of two types of distinct Sn-rich delta phase offers key insights into precise microstructural control in AM Cu-Sn alloys to enhance mechanical properties, providing practical strategies for improving material performance for diverse applications in automotive, aerospace, and machinery industries.
引用
收藏
页数:14
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