Pre-deformation and Aging Characteristics of Cu-3Ti-2Mg Alloy

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-07-01 DOI:10.1016/S1875-5372(18)30168-1

Liu Jia, Wang Xianhui, Ran Qianni, Liu Yanfeng, Li Cong

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引用次数: 4

Abstract

The effect of cold deformation and aging on the microstructure and properties of Cu-3Ti-2Mg alloy was investigated. The microstructure and phase constituents were characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffractometer (XRD), transmission electron microscope (TEM) and electron backscattering diffraction (EBSD), and the hardness and electrical conductivity were measured as well. The results show that the microstructure of as-cast Cu-3Ti-2Mg alloy consists of Cu₂Mg phase, plate-like Cu₄Ti phase and Cu matrix. The microstructural characterizations reveal that the βprime;-Cu₄Ti phase precipitates from the supersaturated Cu matrix during aging. However, excessive aging causes the phase transformation from metastable, coherent βprime;-Cu₄Ti to equilibrium, incoherent Cu₃Ti phases. In the range of experiments, the optimum process for Cu-3Ti-2Mg alloy is solutizing at 700 °C for 4 h, cold deformation of 60%, and aging at 450 °C for 2 h. The electrical conductivity and hardness HV of Cu-3Ti-2Mg alloy are 16.7 %IACS and 3280 MPa, respectively.

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Cu-3Ti-2Mg合金的预变形与时效特性

研究了冷变形和时效对Cu-3Ti-2Mg合金组织和性能的影响。采用光学显微镜(OM)、扫描电镜(SEM)、x射线衍射仪(XRD)、透射电镜(TEM)和电子背散射衍射仪(EBSD)对其微观结构和相组成进行了表征，并对其硬度和电导率进行了测定。结果表明:铸态Cu- 3ti - 2mg合金的显微组织由Cu2Mg相、片状Cu4Ti相和Cu基体组成;显微组织表征表明，在时效过程中，从过饱和Cu基体中析出β′-Cu4Ti相。然而，过度时效导致相变从亚稳的、共相干的βprime;-Cu4Ti转变为平衡的、非共相干的Cu3Ti相。在实验范围内，Cu-3Ti-2Mg合金的最佳工艺为700℃固溶4h，冷变形60%，450℃时效2h。Cu-3Ti-2Mg合金的电导率和硬度HV分别为16.7% IACS和3280 MPa。

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