High Temperature Microstructure Evolution and Property Changes of Precision Silver Alloy Wires

GUO Yanhong; HOU Jiangtao; CHANG Yidong; CHENG Yafang; DONG Xian; ZHANG Guanxing; DONG Bowen; LI Yong

doi:10.3969/j.issn.1674-6457.2026.07.004

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (7) : 41-46. DOI: 10.3969/j.issn.1674-6457.2026.07.004

Key Technologies for Precision Forming of High-end Energy and Aerospace Equipment Components

High Temperature Microstructure Evolution and Property Changes of Precision Silver Alloy Wires

GUO Yanhong¹, HOU Jiangtao^1,*, CHANG Yidong¹, CHENG Yafang^1,2, DONG Xian¹, ZHANG Guanxing¹, DONG Bowen¹, LI Yong¹

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Abstract

To clarify the regulation mechanism of annealing parameters on the microstructure and mechanical properties of silver alloy wires and reveal their intrinsic correlation, the work aims to investigate the regulation law of annealing treatment, thus providing a theoretical basis for precision machining optimization and product quality improvement. Silver alloy wires containing 50% silver with uniform chemical composition were used as the research material. Isothermal annealing at 500 ℃ was conducted in a box furnace, with annealing time set from 10 min to 50 min at a 10 min interval. With annealing time as the single variable, its effects on the microstructure and mechanical properties of the alloy wires were explored. The micro-morphology was characterized via SEM, and the phase composition was analyzed by EDS. Mechanical properties were tested with a Vickers hardness tester and a universal mechanical testing machine to ensure experimental data accuracy and reliability. Annealing time presented a remarkable effect on the microstructure and mechanical properties of silver alloy wires. After 10 min of annealing, the microstructure was uniformly refined with internal stress fully relieved. The alloy consisted of (Ag) solid solution and (CuZnAgNi) intermetallic compound with no obvious micro-defects. As annealing time prolonged, peritectoid transformation took place, accompanied by the formation of a layered AgCuZn eutectic third phase, which gradually homogenized and appeared gray with further heat preservation. In terms of mechanical properties, the alloy wire exhibited the lowest Vickers hardness and remarkably improved plasticity after 10 min annealing. With the extension of annealing time, the hardness increased while the tensile strength decreased, and the plasticity rose initially and then leveled off, which was highly consistent with the microstructure evolution. Annealing time is a crucial factor regulating the microstructure and mechanical properties of silver alloy wires. It tailors material properties by regulating phase transformation and microstructure reconstruction, where microstructural evolution acts as the core cause of performance variation. This work supplements and improves the heat treatment theory of silver alloys, offers technical guidance for precision processing and annealing parameter optimization of such alloy wires, and is of great engineering value for product quality upgrading and application expansion.

Key words

silver alloy wire / annealing / microstructure evolution / peritectoid transformation / mechanical properties

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GUO Yanhong, HOU Jiangtao, CHANG Yidong, CHENG Yafang, DONG Xian, ZHANG Guanxing, DONG Bowen, LI Yong. High Temperature Microstructure Evolution and Property Changes of Precision Silver Alloy Wires[J]. Journal of Netshape Forming Engineering. 2026, 18(7): 41-46 https://doi.org/10.3969/j.issn.1674-6457.2026.07.004

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