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ZL201、ZL203、ZL204、和ZL205高强度铸造铝合金,均属铝铜系。这些合金有的已使用多年,有的正在推广使用。为探索合金的强化机理,阐明抗拉屈服强度变化的内在规律,本文用透射电子显微技术和拉伸试验的方法,研究了六个铸造合金,五种时效状态下试样的拉伸屈服强度和精细结构。 试验结果表明,六个合金抗拉屈服强度峰值所对应的时效精细结构,均为θ″加部分θ′相;但出现峰值的温度不同,含镉的两个合金,,峰值在175℃出现,无镉的四个合金峰值则出现在190℃。
ZL201, ZL203, ZL204, and ZL205 high-strength cast aluminum, are aluminum-copper. Some of these alloys have been used for many years, and some are being promoted. In order to explore the strengthening mechanism of the alloy and clarify the inherent law of the change of tensile yield strength, the transmission electron microscopy and tensile test methods were used to study the mechanical properties of six cast alloys, tensile yield strength And fine structure. The experimental results show that the age-dependent fine structures of the six alloy tensile yield peaks are θ "plus some θ ’phases. However, at the peak temperatures, the two alloys containing cadmium peak at 175 ℃, Four alloys without cadmium peak appeared at 190 ℃.