Microstructure and property evolution of Cu–9Ni–6Sn-xCr alloys during thermo-mechanical treatment process

• DOI: 10.1016/j.jmrt.2024.04.033
• Publication Date: 2024-04-05T19:11:40Z
• Authors: Yuanqi You; Caiju Li; Kui Jin; Jiangnan Li; Qiong Lu; Zunyan Xu; Peng Gao; Xuhui Xu; Fengxian Li; Jianhong Yi
• Keywords: Precipitation hardening

In this study, Cu–9Ni–6Sn-xCr alloys (x = 0, 0.3, 0.6, or 1.0) were designed and prepared. The influence of Cr content on the microstructure, precipitation behavior, mechanical properties was systematically investigated. results show that Cu–9Ni–6Sn-0.6Cr alloy exhibits outstanding higher level electrical conductivity after aging at 400 °C for 8 h: peak-aged hardness reaches 323.6 ± 8.4 HV, with a tensile strength 876.4 MPa an 12.59 0.33% IACS. These excellent comprehensive are attribute to refinement effect DO22 phase within Cu matrix grains. Further analysis reveals addition appropriate amount refines microstructure promotes phase. At same time, also suppresses DO3 grain boundaries, achieving combination plasticity, conductivity, strength. This work suggests potential application prospects in multi-component design Cu–Ni–Sn alloy, 0.6 wt% can achieve good strengthening effects provide performance alloys.