| The Copper alloys are mainly used as materials of lead frame in integrated circuits. As the electronics industry goes fast at the present time, people have stricter reqirement on copper alloys. It is generally acknowleged that the Copper alloys should have the strength of more than600MPa as well as conductivity of80%IACS. The Cu-Cr-Zr alloys have many excellent performances, such as strength of more than590MPa and conductivity of80%IACS. They are agreed to be the most attractive high strength and conductivity Cu alloys and have significant advantages in their applications.The dosages of Cr, Zr and heattreatment technology are keys to improve the performances of Cu-Cr-Zr alloys. It is important that alloy elements dissolve into Cu-base solution as much as possible at high temperature while precipitate at room temperature. The phase diagrams can display chemical ingredient of materials, heating processing and relations between separated phases, they are basic foundation to develop new materials, design alloys ingredient, and choose technology of preparation.The CALPHAD(Calculation of Phase Diagram) technology is used in this study. Firstly, in order to establish Cu-Cr-Zr database, it is necessary to look into existing thermodynamic parameters, and optimize those unkown ones. Secondly, calculate phase equilibriums in Cu-Cr-Zr ternary system by Thermo-calc software. Lastly, calculate the solidification process of different composition alloys by TCW of Thermo-calc software.In order to verify the accuracy of calculation, keep three samples of same composition at1000℃,970℃,960℃,855℃and845℃respectively, for30mins. Then analyze those samples by X-ray diffraction. The result of calculation is in accordance with the one of experiment. |
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