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Effects of Pressure and Number of Turns on Microstructural Homogeneity Developed in High-Pressure Double Torsion
Jahedi, Mohammad; Beyerlein, Irene J.; Paydar, Mohammad Hossein; Zheng, Shijian; Xiong, Ting; Knezevic, Marko; Knezevic, M (reprint author), Univ New Hampshire, Dept Mech Engn, 33 Acad Way,Kingsbury Hall,W119, Durham, NH 03824 USA.
2017-03-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN1073-5623
Volume48AIssue:3Pages:1249-1263
AbstractWith electron backscatter diffraction and transmission electron microscopy, we study the rate of grain refinement and the uniformity in the evolution of microstructure in commercial purity Cu samples during high-pressure double torsion (HPDT). We aim to identify the processing conditions that would produce a microstructure that is both refined and uniform across the sample in grain size, texture, and intra-granular misorientation with minimal energy input. Two processing variables, pressure and number of turns, are probed. To provide a reference for HPDT, the investigation is also carried out using the standard high-pressure torsion (HPT) technique. For both processes, grain sizes decrease with the number of turns and applied pressure. Under pressure of 600 MPa and 4 torsional turns, HPDT provided a more homogeneous grain structure than HPT. Likewise, we also demonstrate that for the same processing condition, HPDT again produces the more homogeneous grain structure. It is found that a more homogeneous grain structure is achieved after doubling number of turns than doubling the pressure amount to 1.2 GPa. However, the rate of grain refinement substantially increases with doubling the pressure. Considering these results, the HPDT process, compared to HPT, takes better advantage of the role that high pressure plays in shear strain-induced grain refinement and homogenizing the microstructure. Last, analysis of the applied work finds that the least amount of work required for achieving fine and homogeneous microstructure occurs when the applied pressure is maximized and number of turns is minimized. (C) The Minerals, Metals & Materials Society and ASM International 2016; With electron backscatter diffraction and transmission electron microscopy, we study the rate of grain refinement and the uniformity in the evolution of microstructure in commercial purity Cu samples during high-pressure double torsion (HPDT). We aim to identify the processing conditions that would produce a microstructure that is both refined and uniform across the sample in grain size, texture, and intra-granular misorientation with minimal energy input. Two processing variables, pressure and number of turns, are probed. To provide a reference for HPDT, the investigation is also carried out using the standard high-pressure torsion (HPT) technique. For both processes, grain sizes decrease with the number of turns and applied pressure. Under pressure of 600 MPa and 4 torsional turns, HPDT provided a more homogeneous grain structure than HPT. Likewise, we also demonstrate that for the same processing condition, HPDT again produces the more homogeneous grain structure. It is found that a more homogeneous grain structure is achieved after doubling number of turns than doubling the pressure amount to 1.2 GPa. However, the rate of grain refinement substantially increases with doubling the pressure. Considering these results, the HPDT process, compared to HPT, takes better advantage of the role that high pressure plays in shear strain-induced grain refinement and homogenizing the microstructure. Last, analysis of the applied work finds that the least amount of work required for achieving fine and homogeneous microstructure occurs when the applied pressure is maximized and number of turns is minimized. (C) The Minerals, Metals & Materials Society and ASM International 2016
description.department[jahedi, mohammad ; knezevic, marko] univ new hampshire, dept mech engn, 33 acad way,kingsbury hall,w119, durham, nh 03824 usa ; [beyerlein, irene j.] univ calif santa barbara, dept mech engn, dept mat, santa barbara, ca 93106 usa ; [paydar, mohammad hossein] shiraz univ, sch engn, dept mat sci & engn, shiraz, iran ; [zheng, shijian ; xiong, ting] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Science Foundation (NSF) [1541918]; Shiraz University [92-GR-ENG-16]; NSF [1209189]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78270
Collection中国科学院金属研究所
Corresponding AuthorKnezevic, M (reprint author), Univ New Hampshire, Dept Mech Engn, 33 Acad Way,Kingsbury Hall,W119, Durham, NH 03824 USA.
Recommended Citation
GB/T 7714
Jahedi, Mohammad,Beyerlein, Irene J.,Paydar, Mohammad Hossein,et al. Effects of Pressure and Number of Turns on Microstructural Homogeneity Developed in High-Pressure Double Torsion[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2017,48A(3):1249-1263.
APA Jahedi, Mohammad.,Beyerlein, Irene J..,Paydar, Mohammad Hossein.,Zheng, Shijian.,Xiong, Ting.,...&Knezevic, M .(2017).Effects of Pressure and Number of Turns on Microstructural Homogeneity Developed in High-Pressure Double Torsion.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,48A(3),1249-1263.
MLA Jahedi, Mohammad,et al."Effects of Pressure and Number of Turns on Microstructural Homogeneity Developed in High-Pressure Double Torsion".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 48A.3(2017):1249-1263.
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