Improving the Mechanical Properties of Cu-15Ni-8Sn Alloys by Addition of Titanium

Chao Zhao; Weiwen Zhang; Zhi Wang; Daoxi Li; Zongqiang Luo; Chao Yang; Datong Zhang

doi:10.3390/ma10091038

Improving the Mechanical Properties of Cu-15Ni-8Sn Alloys by Addition of Titanium

Materials (Basel). 2017 Sep 6;10(9):1038. doi: 10.3390/ma10091038.

Authors

Chao Zhao¹, Weiwen Zhang^{2

3}, Zhi Wang^{4

5}, Daoxi Li⁶, Zongqiang Luo^{7

8}, Chao Yang^{9

10}, Datong Zhang^{11

12}

Affiliations

¹ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. meczhao@mail.scut.edu.cn.
² Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. mewzhang@scut.edu.cn.
³ School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China. mewzhang@scut.edu.cn.
⁴ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. wangzhi@scut.edu.cn.
⁵ School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China. wangzhi@scut.edu.cn.
⁶ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. 201610100610@mail.scut.edu.cn.
⁷ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. mezqluo@scut.edu.cn.
⁸ School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China. mezqluo@scut.edu.cn.
⁹ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. cyang@scut.edu.cn.
¹⁰ School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China. cyang@scut.edu.cn.
¹¹ Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. dtzhang@scut.edu.cn.
¹² School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China. dtzhang@scut.edu.cn.

Abstract

The effect of Ti addition on the microstructure and mechanical properties of Cu-15Ni-8Sn alloys was investigated. Optical microscopy (OM), scanning electronic microscopy (SEM), and transmission electron microscopy (TEM) were used to determine grain size and distribution of the second phases in the alloys. The results indicate that the tensile properties of Cu-15Ni-8Sn alloys are improved significantly with Ti addition. Tensile elongation increased from 2.7% for the alloy without Ti to 17.9% for the alloy with 0.3% Ti, while tensile strength was maintained and even increased from 935 MPa to 1024 MPa. The improvement of the mechanical properties of Cu-15Ni-8Sn alloys by the addition of Ti is attributed to the grain refinement and suppression of discontinuous precipitation during heat treatment.

Keywords: Cu-15Ni-8Sn alloy; discontinuous precipitation; grain refinement; mechanical properties; titanium.