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Enhancing the low cycle fatigue strength of AA6061 aluminum alloy by using the optimized combination of ECAP and precipitation hardening | ||
| Journal of Computational & Applied Research in Mechanical Engineering (JCARME) | ||
| مقاله 12، دوره 6، شماره 2 - شماره پیاپی 12، شهریور 2017، صفحه 115-127 اصل مقاله (1.47 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22061/jcarme.2017.603 | ||
| نویسندگان | ||
| M. Jooybari1؛ J. Shahbazi Karami2؛ M. Sheikhi* 2 | ||
| 1School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 2Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| تاریخ دریافت: 27 دی 1394، تاریخ بازنگری: 08 آذر 1395، تاریخ پذیرش: 28 آذر 1395 | ||
| چکیده | ||
| In the present study, mechanical properties and low cycle fatigue behavior of a solid-solutionized AA6061 aluminum alloy produced by equal channel angular pressing (ECAP) process were investigated. The grain refinement after two passes of ECAP significantly increased the yield stress and ultimate tensile stress and decreased the ductility of the alloy. However, the improvement of low cycle fatigue strength was not as remarkable as expected. Post-ECAP aging heat treatment to the peak-aging condition imposed a notable change in the strength and ductility of the alloy so that its fatigue strength partly enhanced. An optimized combination of grain refinement and distributed fine precipitates in the matrix of the alloy was achieved by conducting aging heat treatment between passes of ECAP. The proposed procedure was proved to yield the best combination of strength and ductility, better distribution and size of precipitates, and thus a remarkable improvement in the low cycle fatigue response of the investigated material. | ||
| کلیدواژه‌ها | ||
| Low cycle fatigue؛ Equal channel angular Al alloy؛ Ultra-fine grained microstructure؛ Precipitation hardening | ||
| مراجع | ||
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