Microstructure, tensile and tribological properties of Cu-15Ni-8Sn alloy fabricated by selective laser melting

被引：2

作者：

Li J.-K. ^{[1
]}

Zhang J.-K. ^{[1
]}

Zhang Z.-W. ^{[1
]}

Li W. ^{[2
,3
,4
]}

Wei Q.-S. ^{[1
]}

机构：

[1] State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan

[2] Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan

[3] Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan

[4] Precision Manufacturing Institute, Wuhan University of Science and Technology, Wuhan

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Cu-15Ni-8Sn alloy; microstructure; selective laser melting; tensile property; tribological property;

D O I：

10.11817/j.ysxb.1004.0609.2021-42733

中图分类号：

学科分类号：

摘要：

The Sn macro-segregation is easy to produce in the traditional casting process for Cu-15Ni-8Sn alloy with high Sn content, which reduces the mechanical properties. In order to reduce the segregation, the alloy was fabricated by selective laser melting (SLM). The microstructure, tensile and tribological properties were investigated by X-ray diffractometer (XRD), optical microscope (OM), scanning electron microscope (SEM), electron probe micro-analyzer (EPMA), electron backscatter diffraction (EBSD), field emission transmission electron microscope (TEM) and laser confocal microscope. The results indicate that Sn segregation is inhibited at the micron level due to the rapid solidification, and a large amount of Sn atoms are dissolved into the matrix. The grains are also refined to about 2.13 μm. The microstructure is composed of Sn-depleted α-Cu(Ni, Sn) matrix and Sn-rich γ - (CuxNi1−x)3Sn precipitates. The diameter of γ particles is about 0.2 μm. The samples have excellent strength and toughness, with the ultimate tensile strength of (572.99±11.07) MPa and the elongation at break of (12.36±1.66)% . The high strength of SLM-fabricated Cu-15Ni-8Sn alloy is due to the contribution of the grain boundary strengthening, solid solution strengthening, precipitation strengthening and dislocation strengthening. The coefficient of friction is 0.5032, and abrasive wear is the dominant wear mechanism, leading to excellent wear resistance. © 2023 Central South University of Technology. All rights reserved.

引用

页码：386 / 399

页数：13

共 25 条

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