机械合金化与热压烧结法制备Cu-Cr-Zr合金
Preparation of Cu-Cr-Zr Alloy by Mechanical Alloying and Hot-pressing Sintering
刘鹏
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作者单位：华东理工大学
中文关键字：机械合金化；Cu-Cr-Zr合金；热压烧结；力学性能
英文关键字：mechanical alloying; Cu-Cr-Zr alloy; hot-pressing sintering; mechanical properties
中文摘要：由于其优越的导电性能和高的强度，铜合金成为目前研究的热点之一。本文以Cu、Cr和Zr粉末为原料，采用机械合金化法活化Cu-Cr-Zr复合粉末，然后对机械合金化后的粉末进行真空热压烧结制备出Cu-Cr-Zr合金材料。利用X射线衍射仪(XRD)分析机械合金化过程中粉末的物相，通过对合金抗弯强度、相对密度、导电率、显微硬度的测试和金相的观察，来研究合金力学性能随温度的变化规律。研究结果表明，球磨促进了Cr和Zr在Cu中的固溶，并细化了各粉末的晶粒。而且随热压烧结温度的增高，其固溶度降低，从而导致材料导电性能增加，同时其力学性能下降。
英文摘要：Owing to its superior conductivity and high strength, copper alloy becomes one of the hot spot of the present research. Using Cu, Cr and Zr powders as raw materials, Cu-Cr-Zr composite powders were activated by mechanical alloying(MA), then used to prepare the alloy materials by vacuum hot-pressing sintering. The phases of the powders during the mechanical alloying process were studied by XRD. Based on the test of alloy’s flexural strength, relative density, conductivity, micro-hardness and the observation of metallograph, the law of alloy’s mechanical properties varying with the change of the temperature was investigated. Research results show that ball milling promotes the solid solution of Cr and Zr in Cu, and refines grain size of the powders. And with the increase of the hot-pressing sintering temperature, its degrees of solid solution was lowered, which increased materials' electric conductivity and decreased mechanical performance.