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分级均匀化对7055铝合金组织和力学性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-10-17
采用差热分析、X射线衍射分析、光学显微镜、扫描电镜、透射电镜和常温拉伸等方法研究分级均匀化工艺对7055铝合金显微组织、枝晶偏析、Al3Zr粒子析出行为和力学性能的影响。
分级均匀化对7055铝合金组织和力学性能的影响Effect of step-homogenization on microstructures and mechanical properties of 7055 aluminum alloy
采用差热分析、X射线衍射分析、光学显微镜、扫描电镜、透射电镜和常温拉伸等方法研究分级均匀化工艺对7055铝合金显微组织、枝晶偏析、Al3Zr粒子析出行为和力学性能的影响。结果表明：合金经(468 ℃、24 h)+(473 ℃、4 h)的分级均匀化处理后，消除了铸锭晶界上的非平衡凝固共晶组织；铸锭先于264 ℃保温最有利于获得尺寸细小、均匀弥散分布的Al3Zr粒子；在单级均匀化基础上增加473 ℃的短时高温均匀化，能够提高合金基体中溶质原子的固溶度，增强时效强化效果，提高综合性能。
The effects of step-homogenization on the microstructures, dendritic segregation, precipitation of Al3Zr particles and ultimate mechanical properties of aluminum alloy 7055 were studied by differential scanning calorimetry, X-ray diffractometry, optical microscopy, scanning electron microscopy, transmission electron microscopy and tensile test. The result show that the step-homogenization treatment, which comprises of the isothermal heating of the ingots at 468 ℃ for 24 h, then heating to 473 ℃ for 4 h, greatly eliminates the nonequilibrium solidified eutectic which exists on the grain boundaries. The previous heating at 264 ℃ is most favorable for the precipitation of fine and uniformly distributed Al3Zr particles. The additional short-term and high temperature heating at 473 ℃ on the basis of single-stage homogenization maximizes the solution ability of solid solute in the matrix, enhances the ageing strengthening effect and improves the comprehensive properties of the alloy.
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