期刊
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
卷 23, 期 8, 页码 4252-4275出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1099636221993886
关键词
Sandwich composite; twist channel angular pressing; TCAP; finite element method; grain refinement; residual stress
类别
资金
- Grant Agency of the Czech Republic [19-15479S]
The study prepared Al/Cu sandwich composite reinforced with Cu-wires using the TCAP method and verified the effectiveness of optimizing deformation processing on enhancing material properties. Extrusion of the sandwich composite led to substantial deformation strengthening of both Al and Cu, increased microhardness, and changes in thermal conductivity.
Development of modern materials is non-negligibly connected with enhancement of their mechanical and utility properties, which can advantageously be performed via optimized deformation processing. The study presents preparation of Al/Cu sandwich composite, reinforced with Cu-wires, by the twist channel angular pressing (TCAP) method. Extrusion of the sandwich composite via single and double pass TCAP was simulated using the finite element method, and performed experimentally. The predicted deformation behaviour was verified by 3 D Micro-CT scanning, as well as detailed microstructure observations. The results showed that already the single TCAP resulted in substantial deformation strengthening of both the component metals, and the effective strain imposed within the Al-sheath reached the value of 5 after the second pass. The Al-sheath also featured homogeneous distribution of the lowest absolute values of residual stress, and the smallest average grain size of 1.66 mu m. The Cu grains within both the composites were also significantly refined, to almost 3 mu m after the second pass. Nevertheless, the observed parameters featured slight variations across the composites' cross-sections, which can be attributed to the plastic flow behaviour phenomena. The severe imposed shear strain also resulted in increase in microhardness and imparted changes in the thermal conductivity.
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