Microstructure and properties evolution of Cu-Ti-Cr-Mg alloy during thermomechanical treatment
Alloying is one of the main methods to improve the performance of Cu-Ti alloys,and it is expected to obtain high performance to replace Cu-Be alloys.A Cu-4Ti-0.5Cr-1Mg alloy was designed,and the effects of thermomechanical treatment on the microstructure and properties of the alloy were investigated.Optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray diffractometry(XRD)were used to analyze the microstructure and phase constituents,and the mechanical properties and electrical conductivity of the material were determined as well.The results show that the addition of Cr and Mg alloy elements does not change the aging sequence of Cu-Ti alloy,but lead to the formation of Cr2Ti intermetallic compounds,and precipitation of β-Cu4Ti phase is inhibited with the increase of the aging time.After 40%cold rolling and 380℃aged for 1 h,the alloy can acquire excellent comprehensive properties,the hardness and strength are 350HV and 1220 MPa,respectively,and the conductivity is 10.84%IACS.The ultra-high strength of design alloys is mainly attributed to β'-Cu4Ti dispersion precipitation strengthening and work hardening.
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