کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
828645 1470324 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of aspect-ratio alterations on plastic-deformation-behavior of a large-plastic bulk metallic glass
ترجمه فارسی عنوان
اثر تغییرات نسبت به رفتار پلاستیک-تغییر شکل-رفتار یک شیشه فلزی بزرگ پلاستیک
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
چکیده انگلیسی


• Influence of aspect ratio alteration on plastic deformation behavior was researched.
• After intense deformation, shear band density raises with decrease in aspect ratio.
• Interaction of large numbers of shear bands can sustain ever-increasing deformation.
• Shear band density is highly dependent on aspect ratio alteration.

Because very limited plastic strain can be developed in bulk metallic glasses (BMGs) before failure under uniaxial loading, the plastic-flow behavior is difficult to investigate. In present paper, through optimizing preparation processes and regulating alloy composition, we prepared a 3 mm-in-diameter Zr-based BMG rod with superplasticity at room temperature by using copper-mold vacuum suction casting. The effect of specimen’s aspect ratios on room-temperature superplastic deformation behavior in the BMG under uniaxial compression was studied at a strain rate of 4.2 × 10−4 s−1. The results showed that there is no sign of fracturing after the BMG specimens have suffered from a nominal strain of 85.5%, i.e., a true strain of 193.1%, indicating the superplasticity of the BMG. With the increase of aspect ratio, compressive strength, plastic strain, true yield stress, end stress and stress fluctuation increase, while elastic modulus, disproportionate stress, stress peak interval, yield strength, elastic strain and shear band sliding interval reduce. The higher the aspect ratios, the larger the densities of shear bands in the deformed side surfaces. During the plastic flow, the pseudo strain-hardening effect becomes more obvious with the increasing aspect ratios, while the real strain-softening effect becomes more serious with the descending aspect ratios.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 73, 15 May 2015, Pages 10–14
نویسندگان
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