Processing of nanostructured metallic matrix composites by a modified accumulative roll bonding method with structural and mechanical considerations

Particulate reinforced metallic matrix composites have attracted considerable attention due to their lightweight, high strength, high specific modulus, and good wear resistance. A1/B4C composite strips were produced in this work by a modified accumulative roll bonding process where the strips were rotated 90° around the normal direction between successive passes. Transmission electron microscopy and X-ray diffraction analyses reveal the development of nanostructures in the Al matrix after seven passes. It is found that the B4C reinforcement distribution in the matrix is improved by progression of the process. Additionally, the tensile yield strength and elongation of the processed materials are increased with the increase of passes.

1050铝合金扭转挤压加工的3D有限元分析(英文)

研究了扭转挤压做为一种大塑性变形加工技术的可行性,并将其与普通的正挤压进行比较。在室温下对AA1050铝合金成功进行了扭转挤压和正挤压。采用商用有限元软件ABAQUS/Explicit模拟挤压过程。结果表明,在扭转挤压中,所需的载荷要比正挤压所需的小。有限元分析结果表明,在扭转挤压中,试样承受了较高的等效塑性应变,在挤压的最后阶段扭转挤压试样中的应变分布较之正挤压更为平滑,均匀。