Microstructure and properties of Cu-TiNi composites prepared by vacuum hot pressing



Zhang, Xi, Xiao, Zhu, Xia, Ziqi, Han, Shuo, Meng, Xiangpeng, Zhao, Yuyuan ORCID: 0000-0003-2356-8435, Li, Zhou and Lei, Qian
(2022) Microstructure and properties of Cu-TiNi composites prepared by vacuum hot pressing. JOURNAL OF ALLOYS AND COMPOUNDS, 897. p. 162729.

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Abstract

Cu-TiNi composites with TiNi volume percentages of 1%, 5%, 10% and 15% were prepared by vacuum hot pressing and hot extrusion. The microstructure, thermal and mechanical properties of the composites were analyzed. The results show that diffusion of elements occurred at the interface between the Cu matrix and the TiNi particles during the preparation process, leading to the formation of a (CuNi)Ti diffusion layer. The TiNi particles are uniformly distributed in the Cu-TiNi composites, with a well-bonded interface with the Cu matrix. Cu matrix has major <111> + minor <001> fiber textures after hot extrusion. There is a semi-coherent relationship between the Cu matrix and the (CuNi)Ti phase, with an orientation relationship of (111)Cu∥(103)(CuNi)Ti and an angle of 18.7° between the two crystal planes. Both the Vickers hardness and the compressive yield strength of the Cu-TiNi composites increased with increasing the volume percentage of the TiNi particles, while the thermal expansion coefficient showed an opposite trend. The thermal expansion coefficient, Vickers hardness and compressive yield strength of the Cu-15% TiNi composite are 14.11 × 10−6 /K, 154.4 Hv and 460.0 MPa, respectively.

Item Type: Article
Uncontrolled Keywords: Cu-TiNi composite, Hot pressing, Interface microstructure, Mechanical properties
Divisions: Faculty of Science and Engineering > School of Engineering
Depositing User: Symplectic Admin
Date Deposited: 25 Nov 2021 08:18
Last Modified: 18 Jan 2023 21:24
DOI: 10.1016/j.jallcom.2021.162729
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3143790