锻造工艺及热处理对含Er7050铝合金组织与力学性能的影响

Effect of Forging Process and Heat Treatment on Microstructure and Mechanical Properties of Er7050 Aluminium Alloy

摘要:

为了探究多向锻造对铝合金微观组织及力学性能的影响，以均火态含Er7050铝合金为研究对象，对该合金在400 ℃下进行了3种不同锻造道次的多向锻造，即三墩三拔（3U3CS）、六墩六拔（6U6CS）以及九墩九拔（9U9CS）。随后，合金经过固溶处理、水淬和T6时效处理。对样品进行微观结构分析和机械性能测试。通过比较3种不同锻造工艺所得样品的机械性能，发现经过九墩九拔锻造工艺处理的样品具有最佳的机械性能，这归功于该锻造工艺使其产生细小的晶粒和致密的析出强化相，该锻造工艺条件下样品的平均抗拉强度为621.4 MPa，平均屈服强度为545.4 MPa，平均伸长率为13.58%，对比其他两种锻造工艺处理的样品均有提升，这表明优化的锻造工艺显著改善了机械性能。

Abstract:

In order to explore the effect of multi-directional forging on the microstructure and mechanical properties of aluminium alloy, this paper took the homogenized Er7050 aluminum alloy as the research object. The alloy samples were subjected to multi-directional forging of three kinds of forging passes at 400 ℃, namely three-time upsetting and three-time cross stretching (3U3CS), 6U6CS and 9U9CS. Subsequently, the samples were subjected to solid solution treatment, water quenching and T6 aging treatment. The microstructure and mechanical properties of the samples were analyzed. Comparison of the mechanical properties of the samples obtained by the different forging processes reveals that the sample treated by the 9U9CS forging process has the best mechanical properties, which is attributed to its fine grains and dense precipitated strengthening phases. The average tensile strength of the sample under this forging process is 621.4 MPa, the average yield strength is 545.4 MPa, and the average elongation is 13.58%, which indicates that the optimized forging process significantly improves the mechanical properties of the alloy.