The Influence of Rolling and Aging Treatment on the Precipitation Behavior and Properties of Cu–3Ti Alloy
摘要
This study conducted multiple cold rolling and aging treatments on Cu-3Ti alloy, systematically exploring the “primary cold rolling—aging + secondary cold rolling—aging” process, and deeply analyzed the influence of aging parameters at different stages on the mechanical properties, electrical conductivity, and microstructure evolution of the alloy. Through tensile tests, electrical conductivity measurements, and transmission electron microscopy (TEM) observations, the formation behavior of precipitates at each aging stage and their regulatory effects on the comprehensive performance were analyzed. The results show that the optimal performance is achieved when the first aging is carried out at 450 °C for 4 h, with a tensile strength of 997 MPa and an electrical conductivity of 18.7% IACS. On this basis, after a secondary aging at 400 °C for 3 h, the tensile strength of the alloy is further increased to 1187 MPa, and the electrical conductivity is simultaneously improved to 21.89% IACS. Microstructure analysis confirmed that Cu4Ti phase is the main strengthening precipitate. At the same time, based on the Avrami equation, the precipitation kinetics models under aging conditions of 400 °C, 450 °C, and 500 °C were established, quantitatively describing the evolution relationship of the precipitated volume fraction with aging time. The strengthening mechanism analysis further confirmed that precipitation strengthening is the main strengthening method of this alloy.