The present work reports a simple one-step powder metallurgy approach for producing bulk fine-grained Al2024 alloy with a unique harmonic structure and superior mechanical properties. The grain size of the bulk specimen could be easily manipulated by changing the initial powder size. Tensile test suggested that the yield strength of the fine-grained specimen with an average grain size of 3.78 µm (powder size ∼20 µm) was about 265 MPa, which was three times higher than that of the conventional coarse-grained counterpart, maintaining a good ductility (total elongation ∼15%). The reasons for the unique microstructure and the enhanced mechanical properties were discussed.

本工作报告了一种简单的一步法粉末冶金方法，用于生产具有独特的谐波结构和优异的机械性能的块状细晶粒Al2024合金。通过改变初始粉末尺寸可以很容易地控制大块试样的晶粒尺寸。拉伸试验表明，平均晶粒尺寸为3.78 µm（粉体尺寸为〜20 µm）的细颗粒试样的屈服强度约为265 MPa，比常规粗颗粒试样的屈服强度高三倍。良好的延展性（总伸长率约15％）。讨论了独特的微观结构和增强的机械性能的原因。