【作者】 许崇龙；

【导师】 陈九磅；

【作者基本信息】 合肥工业大学 ， 材料学， 2007， 硕士

【摘要】 采用半连续铸造制成的Cu-17-Zn-0.4Cr合金(质量分数％)，通过硬度、强度测试、电阻率测试、金相分析、XRD分析、SEM及TEM分析等测试方法研究了不同加工和热处理工艺对该合金的力学性能、导电性能及其组织结构的影响和变化规律，并从理论上进行了分析和解释。研究结果表明：1．Cu-Zn-Cr合金是典型的时效强化型合金。本试验条件下，Cu-17Zn-0.4Cr合金固溶时效的最佳工艺为930℃快速热轧淬火+450℃／1h时效，合金的强度和导电性为：σ_b=458.51MPa，σ_r=55.1％IACS。2．快速热轧淬火工艺具有固溶淬火和加工强化的双重作用，使热轧态合金具有较高的硬度。3．本实验合金Cu-17Zn-0.4Cr的强化机制有两种。合金在时效初期，其强化的方式为共格强化。而在时效后期，共格关系消失，析出相长大，则符合Orowan强化机制。4．对实验合金导电性影响最大的是溶质原子。可用下式估算合金元素Cr对电阻率的贡献5．该合金有较好导电性的根本原因在于时效后形成的弥散型复相结构，细小的析出粒子弥散分布于高导电率的基体中，对导电率的影响很小。其导电机制可用单元立方体导电模型来解释。更多还原

【Abstract】 Cu-17Zn-0.4Cr(wt%) alloys which were prepared by half continuous cast way.Through hardness measurement,tensile test at room temperature, electrical resistant test at room temperature, microstructure analysis, XRD analysis, SEM and TEM analysis methods, the mechanical and electric properties and the microstructure of above alloys at different work and heat treatment technologies were studied. Some of them were also analyzed and explained in theory.The results show that:The first,Cu-Zn-Cr alloy is a typical aging strengthening alloy;under this experiment condition,the better technology is that the alloys are rapid hot rolling and quenching(the start rolling temperature is 930℃),then precipitated at 450℃for 1 hour.The second,rapid hot rolling and quenching can hold the effects of working hardening.The third,the alloys have two kinds of strengthening mechanisms.In the initial stage of aging the strengthening mechanism is coherent mechanism ,but the relationship of coherent disappears with the phase grows up in the anaphase of aging,then the alloys’ strengthening mechanism is Orowan mechanism.The fourth,electrical conductivity of alloys. was influenced most by solute atoms.we can use the follow equation to calculate the contribution to the alloys of CrFinally,high-conductivity of alloys come from disperse and duplex phase structure.Tt’s conducting mechanism can be explained by cubic conducting unit model.更多还原