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2124铝合金蠕变时效的微结构与性能2124铝合金蠕变时效的微结构与性能Microstructure and properties of creep aged 2124 aluminum alloy 研究蠕变时效前预处理（15%预变形+100 ℃预时效5 h）对可热处理强化2124铝合金蠕变时效成形的影响。采用SEM分析、TEM分析以及测定电导率、维氏硬度和拉伸性能等手段，分析两种不同初始状态试样经过蠕变时效后的微结构和性能。结果表明：初始预处理降低了蠕变时效过程中蠕变初始阶段的蠕变伸长率，但增大了稳态蠕变阶段的蠕变速率；初始预处理对基体中粗大Fe、Si相有一定的破碎作用，蠕变时效过程中，粗大粒子在蠕变应力作用下进一步被破碎；预处理能够改善第二相的析出形态和分布，使析出相分布均匀；预处理试样的电导率比未预处理试样的电导率高，其硬度和强度也较高，但伸长率较低。 The effect of pre-treatment（15% pre-deformation +100 ℃ pre-aging for 5 h）on creep age forming of aluminum alloy 2124 sheets, which can be enhanced by heat treatment, was investigated. The microstructures and properties of two sheets with different pre-treatments were analysed by means of SEM, TEM and measuring the electrical conductivity, Vickers hardness and tensile performance. The results show that the pre-treatment reduces the elongation of the initial stage of creep, but increases the steady-state creep rate; the coarse Fe and Si second phase particles are crushed to certain degree by the pre-treatment, and such coarse particles are further broken down by the subsequent creep stress. The morphology and distribution of the precipitated second phase particles are also improved by pre-treatment. The pre-treated sample depicts higher electrical conductivity, hardness and strength but smaller elongation rate than the non-pre-treated one.
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