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Study And Application Of High-Property Cu-Cr(Zr,Mg) In Situ Composite

Posted on:2002-04-03Degree:DoctorType:Dissertation
Country:ChinaCandidate:J T ZhangFull Text:PDF
GTID:1101360032451354Subject:Mineral processing engineering
Abstract/Summary:PDF Full Text Request
A new generation of Cu-Cr(Zr,Mg) in-situ composite, which possesses high strength and good electrical conductivity, is proposed in this thesis. By traditional ways, the material can be made into various-shaped products with large cross-section. It takes advantage of precipitation strengthening and ribbon-shaped in-situ composite phases to increase the longitudinal strength with little influences on conductivity, which fulfilled the requirements of both strength and conductivity at lower cost. In the thesis, the preparation and forming processes of in situ composite are introduced and analyzed in detail. By means of SEM and TEM technique, the microstructures in the states of casting, cold working and aging are observed and the second phases, especially the in-situ strengthening phases are analyzed. After aging of various time and temperatures, the aging characteristics is discussed and the precipitating action of Cr particles is described and the relationship among the recrystallization, cold working and chromium precipitation are concluded. At the same time, by adding metal elements such as Zr and Mg. it succeeds in avoiding the tendencies of thermal crackle and high-temperature softening, which confined the usage of traditional Cu-Cr alloys. The mechanism of these elements to the strength and conductivity are also discussed. To get the best results of different strengthening mechanism, mathematical model are built to quantify them. At last, the optimum technology processes including preparation, heat treatment and forming is put forward and the application example, which is guided by the technology processes, has been completed.
Keywords/Search Tags:In-situ Composite, Plastic Deformation, Aging, Microstructure, Strengthening, Mathematical Model, Optimum Technology
PDF Full Text Request
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