Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 26, Issue 10, Pages 5107-5117Publisher
SPRINGER
DOI: 10.1007/s11665-017-2946-6
Keywords
Al alloy; ECAP; thermal stability; ultrafine-grained; ultrasonic vibration
Categories
Funding
- National Natural Science Foundation of China [51575360, 51375315, 51405306]
- Major Science and Technology Project of Guangdong Province [2014B010131006]
- Natural Science Foundation of Guangdong Province [2016A030310036]
- Science and Technology Project of Shenzhen [JSGG20140519104809878]
- Science and Technology Project of Nanshan District of Shenzhen [KC2014JSJS0008A]
- Research and Development Foundation of Science and Technology Project of Shenzhen [JCYJ201404 18095735629, JCYJ20150525092941049, JCYJ20160308091 758179, JCYJ20150525092941026]
- Fundamental Research Funds for Shenzhen University [2015-27]
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Equal-channel angular pressing (ECAP) is an efficient technique to achieve grain refinement in a wide range of materials. However, the extrusion process requires an excessive extrusion force, the microstructure of ECAPed specimens scatters heterogeneously because of considerable fragmentation of the structure and strain heterogeneity, and the resultant ultrafine grains exhibit poor thermal stability. The intermittent ultrasonic-assisted ECAP (IU-ECAP) approach was proposed to address these issues. In this work, ECAP and IU-ECAP were applied to produce ultrafine-grained Al-6061 alloys, and the differences in their mechanical properties, microstructural characteristics, and thermal stability were investigated. Mechanical testing demonstrated that the necessary extrusion force for IU-ECAP was significantly reduced; even more, the microhardness and ultimate tensile strength were strengthened. In addition, the IU-ECAPed Al alloy exhibited a smaller grain size with a more homogeneous microstructure. X-ray diffraction analysis indicated that the intensities of the textures were weakened using IU-ECAP, and a more homogeneous microstructure and larger dislocation densities were obtained. Investigation of the thermal stability revealed that the ultrafine-grained materials produced using IU-ECAP recrystallized at higher temperature or after longer time; the materials thus exhibited improved thermal stability.
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