锻压技术

轧制方案对7075铝合金T6板的影响

英文标题：Influence of rolling scheme on 7075 aluminum alloy T6 plates

作者：武磊何兵石伟和古斌覃文东陆丽芸覃铭

关键词：7075铝合金轧制 T6热处理电导率固溶

分类号：TG166.3

出版年,卷(期):页码：2022,47(11):159-164

摘要：

以7075铝合金板为研究对象，采用“厚板坯多道次”和“薄板坯单道次”两种轧制方案，获得了厚度相近的轧制铝合金板，并对比了T6热处理后铝合金板的金相组织、拉伸性能和断口形貌，观察并分析了板中的未溶相和析出相，测量了固溶后水淬和T6热处理后的铝合金板的电导率，并分析了影响电导率的因素。结果表明：方案1中，铝合金板的晶粒伸长、晶界明显，拉伸断口中韧窝细小均匀，析出相粒子弥散分布，组织均匀性更优；方案2中，铝合金板断口中可观察到存在颗粒粗大的未溶相粒子。方案1中铝合金板的强度和电导率略高于方案2，而伸长率略低。方案1中铝合金板的性能更优，适用于追求性能指标的情况；方案2中铝合金板虽然性能略低，但生产效率更高、能量消耗更少，可在强调生产效率和能耗控制的情况下采用。

For 7075 aluminum alloy plates, two rolling schemes of multi-pass for thick plate and single-pass for thin plate were adopted, and the rolled aluminum alloy plates with similar thickness were obtained. Then, the metallographic structure, tensile properties and fracture morphology of aluminum alloy plates after T6 heat treatment were compared, and the undissolved phase and precipitated phases in the plate were observed and analyzed. Furthermore, the conductivities of aluminum alloy plates after solution water quenching and T6 heat treatment was measured respectively, and the factors affecting the conductivity were analyzed. The results show that the grains of the aluminum alloy plate in scheme 1 are elongated, the grain boundaries are obvious, the dimples in the tensile fracture are small and uniform, the precipitation particles are dispersed and distributed, and the uniformity of the structure is better. In scheme 2, the undissolved phase particles with coarse particles can be observed in the fracture of the aluminum alloy plate. The strength and conductivity of the aluminum alloy plate in scheme 1 are slightly higher than those of scheme 2, while the elongation is slightly lower. The aluminum alloy plate in scheme 1 has better performance and is suitable for the pursuit of performance indicators. However, although the performance of the aluminum alloy plate in scheme 2 is slightly lower, it has higher production efficiency and less energy consumption, which is suitable for emphasizing production efficiency and energy consumption control.

基金项目：

国家自然科学基金资助项目(51961001)；广西壮族自治区教育厅“稀土合金结构研究与性能开发重点实验室”培育基地项目（RZ2000003730）

作者简介：武磊（1981-），男，博士，工程师，E-mail：toalbvi@163.com；通信作者：覃铭（1963-），男，学士，教授，E-mail：13507767466@163.com

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