Enhancing the low cycle fatigue strength of AA6061 aluminum alloy by using the optimized combination of ECAP and precipitation hardening

Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_JCARME-6-2_010

تاریخ نمایه سازی: 7 شهریور 1396

Abstract:

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 refinementafter 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 anddistributed fine precipitates in the matrix of the alloy was achieved by conducting aging heat treatment between passes of ECAP. The proposedprocedure 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.

Authors

m Jooybari

School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

j Shahbazi Karami

Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

m Sheikhi

Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran