The Influence of Aging Temperatures on the Microstructure and Stress Relaxation Resistance of Cu-Cr-Ag-Si Alloy
Source abstract
Abstract
Copper alloys used in connectors rely significantly on stress relaxation resistance as a key property. In this study, a heavily deformed Cu-Cr-Ag-Si alloy underwent aging at varying temperatures, with a subsequent analysis of its mechanical properties and microstructure, with a particular emphasis on understanding the mechanism of improving stress relaxation resistance. As the aging temperature rose, the Cr precipitated into a Cr-Si composite element precipitated phase. Both work hardening and precipitation strengthening played vital roles in enhancing the stress relaxation resistance of the Cu-Cr-Ag-Si alloy, with the latter exerting a more pronounced impact. The notable performance enhancement observed after aging at 450 °C can be attributed to the synergistic effects of work hardening and precipitation strengthening. Following aging at 450 °C, the alloy demonstrated optimal performance, boasting a tensile strength of 495.25 MPa, an electrical conductivity of 84.2% IACS, and a level of 91.12%. These exceptional properties position the alloy as a highly suitable material for connector contacts.
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Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Advanced materials and composites · Electrical Contact Performance and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
Institute of Materials, Henan Academy of Sciences, Zhengzhou 450046, China
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
Funding
Henan key research and development project · Luoyang major science and technology innovation special project · National Natural Science Foundation of China
References (33)
Show source-provided references
1. The Influence of the Vibration Test Mode on the Failure Rate of Electrical Connectors10.1016/j.microrel.2022.114567 ↗
2. Material Selection in the Design of Electrical Connectors10.1016/j.jmatprotec.2004.04.209 ↗
3. Prediction of the Behaviour of Copper Alloy Components under Complex Loadings by Electro-Thermomechanical Coupled Simulations10.1080/02670836.2018.1471380 ↗
4. Rapidly Solidified Strips of Cu-Cr Alloys10.1016/1359-6462(96)00053-X ↗
5. The Evolution of Microstructure and Properties of Cu-Cr Alloys Synthesized via Flake Powder Metallurgy Assisted by Mechanical Alloying and Hot Pressing10.1016/j.mtcomm.2022.104452 ↗
6. Zr-Containing Precipitate Evolution and Its Effect on the Mechanical Properties of Cu–Cr–Zr Alloys10.1016/j.jmrt.2021.07.020 ↗
7. Effect of Mg on the Stress Relaxation Resistance of Cu–Cr Alloys10.1016/j.msea.2020.140144 ↗
8. Mechanical Properties of Cu–Cr System Alloys with and without Zr and Ag10.1007/s10853-007-2159-8 ↗
9. Influence of Trace Silicon Addition on the Strengthening Precipitates, Mechanical Properties and Stress Relaxation Resistance of Cu-Cr Alloy10.1016/j.jallcom.2023.169619 ↗
10. Aging Process and Strengthening Mechanism of Cu–Cr–Ni Alloy with Superior Stress Relaxation Resistance10.1016/j.jmrt.2022.06.060 ↗
11. A Procedure to Obtain Correlation Curve between Local Misorientation and Plastic Strain10.1016/j.matchar.2023.112725 ↗
12. Xu, G., Zhu, Y., Peng, L., Xie, H., Li, Z., Huang, S., Yang, Z., Zhang, W., and Mi, X. (2022). Effect of Sn Addition on Microstructure, Aging Properties and Softening Resistance of Cu-Cr Alloy. Materials, 15.10.3390/ma15238441 ↗
13. Recrystallization Behaviour during Annealing of Cold-Rolled Cu–5Fe–2Sn Alloy10.1080/02670836.2020.1759275 ↗
14. The Microstructural Origin of Work Hardening Stages10.1016/j.actamat.2018.02.002 ↗
15. Cyclic Deformation Mechanisms and Microcracks Behavior in High-Strength Bainitic Steel10.1016/j.msea.2016.12.018 ↗
16. Effects of Mg Addition on the Microstructure and Softening Resistance of Cu–Cr Alloys10.1016/j.msea.2020.139009 ↗
17. Evolution of the Microstructure and Properties of a Cu–Cr-(Mg) Alloy upon Thermomechanical Treatment10.1016/j.jallcom.2020.157582 ↗
18. Understanding Grain Boundary Electrical Resistivity in Cu: The Effect of Boundary Structure10.1021/acsnano.1c06367 ↗
19. Approaches to Measure the Resistivity of Grain Boundaries in Metals with High Sensitivity and Spatial Resolution: A Case Study Employing Cu10.1021/acsaelm.0c00311 ↗
20. Influence of Grain Boundary State on Electrical Resistivity of Ultrafine Grained Aluminium10.1080/14786435.2016.1204022 ↗
21. Effect of Trace Alloying Elements on the Stress Relaxation Properties of High Strength Cu–Ti Alloys10.1016/j.msea.2022.143281 ↗
22. Microstructure Evolution and Dislocation Strengthening Mechanism of Cu–Ni–Co–Si Alloy10.1016/j.msea.2021.142023 ↗
23. Critical Role of κ-Carbides in the Multi-Stage Work Hardening Process of a Lightweight Austenitic Steel10.1016/j.matchar.2023.112853 ↗
24. Effect of Aging Treatment on the Microstructure and Properties of a Novel Medium-Heavy NiWCoTa Alloy Subjected to Pre-Deformation10.1007/s11665-022-07729-w ↗
25. Effect of Aging-Treatment on Dynamic Compression Behaviour and Microstructure of ZK60 Alloy10.1080/02670836.2021.1987682 ↗
26. The Tensile Properties and Microstructure Evolution of Cold-Rolled Fe–Mn–C TWIP Steels with Different Carbon Contents10.1016/j.msea.2022.142862 ↗
27. Mechanical Properties Optimization of a Cu–Be–Co–Ni Alloy by Precipitation Design10.1016/j.jallcom.2016.11.014 ↗
28. A Precipitation-Hardened High-Entropy Alloy with Outstanding Tensile Properties10.1016/j.actamat.2015.08.076 ↗
29. The Phase Transformation and Strengthening of a Cu-0.71 Wt% Cr Alloy10.1016/j.jallcom.2017.03.069 ↗
30. Creep Rupture Behaviour of Modified 9Cr-1Mo Heat-Resistant Steel Strengthened with Different Mechanisms10.1080/09603409.2019.1662981 ↗
31. Modeling the Creep Threshold Stress Due to Climb of a Dislocation in the Stress Field of a Misfitting Precipitate10.1016/j.actamat.2011.04.044 ↗
32. Strengthening Mechanisms in Al–Ni–Sc Alloys Containing Al3Ni Microfibers and Al3Sc Nanoprecipitates10.1016/j.actamat.2018.10.059 ↗
33. Stress-Relaxation Ageing Behavior and Microstructural Evolution under Varying Initial Stresses in an Al–Cu Alloy: Experiments and Modeling10.1016/j.ijplas.2019.102646 ↗