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Cu-Cr-Zr and Cu -Zn -Cr - Zr alloy aging characteristics of

Author: ZhangShengLong
Tutor: YinZhiMin
School: Central South University
Course: Materials Physics and Chemistry
Keywords: Cu-Zn-Cr-Zr alloys BAR End ring Strengthening mechanisms Conduction mechanisms
CLC: TG146.11
Type: Master's thesis
Year: 2002
Downloads: 210
Quote: 6
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Abstract


The ingot metallurgy prepared by the high-power asynchronous traction motor rotor guide bar alloy and end ring alloy, hardness testing, the room temperature tensile, high-temperature tensile and conductivity measurement, metallographic analysis, XRD, SEM, TEM and other methods. different processing technology and heat treatment of the alloy mechanical properties, electrical properties, and its organizational structure and changes in the law, and the analysis and interpretation of the theory. The results show that: 1. Cu-Zn-Cr-Zr alloy is typical aging strengthening type alloys. In this thesis, under the experimental conditions, of BAR alloy better processing performance the squeeze - water quenching - cold pull -450 ° C / 4h aging, mechanical and electrical properties of the alloy can reach: σb = 467MPa σ0.2 = 390MPa. δ5 = 20.8% σr = 64.6% IACS; better end ring alloy hot forging process - solution -450 ℃ / 4h aging, mechanical and electrical properties of the alloy can reach: σb = 388MPa, σ0.2 = 315MPa. δ5 = 27.8%, σr = 84.65% IACS. 2. Of alloys not only at room temperature and has a good strength and conductivity, and has high temperature strength, the guide strip alloy at 350 ℃ σb remained at about 274MPa, σ0.2 still maintained at about 250MPa; alloy in the end ring 350 ℃ σb remains above 200MPa, σ0.2 still maintained at above 165 MPa. 3. Research alloy strengthening mechanisms including solid solution strengthening, work hardening and precipitation hardening. Thermomechanical treatment (solution - cold drawn - aging) process can greatly improve the ultimate strength of the alloy after aging, thermomechanical treatment has little effect on resistivity after aging. Cold drawn alloy aging process by the influence of precipitation and recrystallization process interaction. Precipitation of second phase particles not only strengthen the matrix and to some extent inhibited recrystallization, so as to further improve the hardness of the alloy. 4. The cold deformation - the aging process, the main factors affecting the alloy conductivity changes replies - recrystallization process, the supersaturated solid solution decomposition and precipitation, reply and recrystallization of the alloy conductivity increased, too decomposition of supersaturated solid solution makes the matrix solid solution also significantly reduce the conductivity significantly increased. 5. Complex phase structure formed after the alloy of high conductivity fundamental reason is that aging diffuse, fine precipitated particles dispersed into the matrix of the high electric conductivity, has little effect on the conductivity. The conductive mechanism available the unit cube conductive model to explain.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Heavy non - ferrous metals and their alloys > Copper
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