کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1574594 1514723 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains
چکیده انگلیسی

The effect of extensive grain refinement through equal-channel angular processing (ECAP) at 300 °C on the mechanical properties was examined in a Zr-modified 5083 aluminum alloy. It was shown that any increase in the yield stress (YS) by increasing the number of pressings was attributed to additional contributions from three strengthening mechanisms: (i) grain boundary strengthening related to the size of the crystallites bounded by deformation-induced high-angle boundaries (HAB), (ii) dislocation strengthening related to highly increased dislocation density and (iii) solute strengthening related to promoting dynamic strain aging (DSA) by intense plastic straining. Grain size strengthening is the primary contributor to the increase in the YS as a result of ECAP. Dislocation strengthening plays an important but minor role in strengthening the alloy after ECAP. No ECAP effect on the dispersion strengthening was observed. However, a dispersion of nanoparticles was found to cause an increase in the YS through grain refinement and the accumulation of lattice dislocations during ECAP. It was found that the deformation-induced low angle boundaries (LABs) play an insignificant role in the strengthening of the material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 620, 3 January 2015, Pages 246–252
نویسندگان
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