Research Of The Microstructure And Mechanical Properties Of Cu-Cr-Zr Alloy By Solution Treatment And Aging Process

Three main factors and their levels influencing the Cu-Cr-Zr alloy's properties are studied by orthogonal test. The result show that the change of the solid solution temperature have the greatest impact on properties oh alloy, the second one is aging temperature, the third one is aging time. The best heat-treatment process is the solid solution at 980℃, and aging at 450℃for 3h. Furthermore, the result by detection the change of hardness,strength of extension,and electrical conductivity and the observation of microscopic structrure consistent with conclusions of above. The further research on the alloy show that: the excellent overall properties of Cu-Cr-Zr alloy is because of the result of working together by small -scale precipitation Cr partical and lots of twins generated in the base. The exist of twins can not only improve the strength also have little effect on electrical conductivity. The Cr put in the alloy can lead to appearance of twins. Because it can reduce the fault energy of alloy, so the fault is easy to generate. We can get the conclution by calculation that generate fault once every 256 atomic layers in (111) by solid solution at 980℃and aging at 450℃for 3h. In the ealy time of precipitation, the Cr partical keep coherence relations with base, as the increase of aging time the coherence is destruted, after aging for 3h, the precipitation partical cast off the coherence with base, then strength the base by Orowan principle.