کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1574235 1514707 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hardness−strength relationships in fine and ultra-fine grained metals processed through constrained groove pressing
ترجمه فارسی عنوان
ارتباطات سختی در فلزات خوب و فوقالعادهای که از طریق فشار دادن محور محدود میشوند
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی

Fine grained (FG) and ultra-fine grained (UFG) materials processed by severe plastic deformation exhibit beneficial hardness and tensile properties. Constrained groove pressing (CGP) were employed for fabrication of FG and UFG sheet metals and accomplished into different types of metals and alloys, such as commercial pure aluminum, AA3003 aluminum alloy, commercial pure copper, nickel, titanium and low carbon steels. Tensile and hardness characteristics in the FG and UFG sheets have been assessed with the aim of evaluating the hardness−strength relationship frequently established for coarse-grained metals and alloys (σUTS/HV=3.45σUTS/HV=3.45). However, it was revealed that the FG and UFG materials do not obey widely used hardness−strength relationships in the conventional coarse grained structures. A new multiplicity factor less than 3, depending on the chemical composition of processed materials, is proposed in this study. This is attributed to different strain hardening response of the FG and UFG materials with slight work hardening before necking instability. In fine grained and ultra-fine grained structures failure does not occur in (or right after) the onset of necking point. That is, tensile deformation sustains significantly up to fracture point due to the role of superplasticity mechanisms.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 636, 11 June 2015, Pages 331–339
نویسندگان
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