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探讨了Cu-0.4%Cr-0.2%Zr-0.15%Mg合金在铸态下各相的存在形式以及浇注温度对合金力学性能的影响。Cu-Cr-Zr-Mg合金的铸造采用真空离心半连续铸造技术。离心的转速设置在150 r.min-1,离心时间为10 min。浇注温度分别设置在1120,1150,1200℃。铸造出来的试样采用SEM和EDXS分析了组织形态,发现合金组织在高倍下呈现α-固溶体单相组织,Cr,Zr,Mg和Cu形成共晶组织,这些共晶组织呈条状、点状、带状的形式均匀分布在基体中。Cr相的存在形式有两种:一种是以单质点状的形式存在于基体中,另外一种是以CrCu2(ZrMg)金属间化合物呈现环状包隔着Cu2(Zr7Mg)的形式存在于基体中。Zr相和Mg相的存在形式也有两种:一种是与Cu,Cr形成金属间化合物CrCu2(ZrMg),另外一种是与Cu形成的金属间化合物Cu2(Zr7Mg)。在力学性能方面3种浇注温度得出合金铸态下抗拉强度依次为195,212,177 MPa,合金的延伸率依次为24.2%,23.5%,22.9%。这一测试结果表明:3种浇注温度合金的延伸率比较接近,而浇注温度为1150℃时合金的抗拉强度最好,分别比浇注温度为1120和1200℃的合金抗拉强度提高9%和20%。最佳浇注温度定在1150℃。
The influence of the existence of each phase of Cu-0.4% Cr-0.2% Zr-0.15% Mg alloy and the pouring temperature on the mechanical properties of the alloy was discussed. Cu-Cr-Zr-Mg alloy casting using centrifugal casting semi-continuous vacuum technology. Centrifugal speed set at 150 r.min-1, centrifugation time was 10 min. Pouring temperature was set at 1120,1150,1200 ℃. The cast samples were analyzed by SEM and EDXS. The results show that the microstructure of α-solid solution single phase microstructure and Cr, Zr, Mg and Cu forms eutectic microstructure at high magnification. The eutectic microstructure is strip, , Strip-like form evenly distributed in the matrix. Cr phase exists in two forms: one is in the form of a single point in the matrix, the other is based on the CrCu2 (ZrMg) intermetallic compound present in the form of a ring surrounded by Cu2 (Zr7Mg) in the matrix in. There are two kinds of Zr and Mg phases: one is CrCu2 (ZrMg) with Cu and Cr and the other is Cu2 (Zr7Mg) with Cu. The mechanical properties of the three kinds of pouring temperature obtained alloy as-cast tensile strength of 195,212,177 MPa, followed by the elongation of the alloy was 24.2%, 23.5%, 22.9%. The test results show that: the elongation of the three kinds of pouring temperature alloy is relatively close, and the best tensile strength of the alloy is 1150 ℃, the tensile strength of the alloy is 9% higher than the casting temperature of 1120 and 1200 ℃ respectively 20%. The best pouring temperature is set at 1150 ℃.