کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1573826 | 1514691 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructural evolution and strength variability in microwires
ترجمه فارسی عنوان
تکامل میکرو سازمانی و تغییرپذیری قدرت در میکروویوها
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Tensile experiments on cold-drawn Ni microwires with diameters from ~115 to 50 µm revealed high strengths, with significant strength variability for finer wires with diameters less than ~50 µm. The wires showed pronounced necking at fracture. The coarser wires with diameters >50 µm exhibited conventional ductile cup-cone fracture, with dimples in the central zone and peripheral shear lips, whereas finer wires failed by shear with knife or chisel-edge fractures. Shear bands were observed in all samples. Further, through- section microscopy of selected fractured samples revealed that the shear bands did not go across the enitre specimen for the coarser wires. The shear bands led to grain fragmention, with a reduction in grain aspect ratio as well as rotations away from the initial <111> orientations. The strength data were analysed based on a Weibull approach. The data could be rationalized in terms of failure from volume defects in coarser wires, with a high Weibull modulus, and from surface defects in finer wires, with a low Weibull modulus and greater variability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 652, 15 January 2016, Pages 239-249
Journal: Materials Science and Engineering: A - Volume 652, 15 January 2016, Pages 239-249
نویسندگان
S. Agepati, P. Ghosh, A.H. Chokshi,