کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7973785 1514630 2018 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Twinning in [001]-oriented single crystals of CoCrFeMnNi high-entropy alloy at tensile deformation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Twinning in [001]-oriented single crystals of CoCrFeMnNi high-entropy alloy at tensile deformation
چکیده انگلیسی
This paper presents research about the tensile deformation behaviour and deformation mechanisms (slip and twinning) in single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 (at%) high-entropy alloy (HEA) oriented along the [001] direction in the temperature range T = 77-573 K. Classical studies on single crystals of pure metals and their substitution alloys with the face-centered cubic (FCC) structure, with a low stacking fault energy, have shown that deformation twinning in single crystals oriented along the [001] direction does not develop at tensile deformation. In the present paper, extrinsic stacking faults and deformation twinning in the [001]-oriented single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 HEA were detected under tensile loading at the temperature of liquid nitrogen after a strain of 5%. The critical resolved shear stress for twinning was determined as τcrtw =210 ± 10 MPa. Deformation twinning in the [001]-oriented single crystals leads to an increase in the strain hardening coefficient in comparison with the slip deformation in these crystals at T > 77 K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 713, 24 January 2018, Pages 253-259
نویسندگان
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