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Developing SPD Methods Processing Bulk Nanostructured Materials with Enhanced Properties
Valiev, R . Z . 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.5
Severe plastic deformation (SPD), i.e. intense plastic straining under high pressure, is an innovative technique for processing ultrafine-grained nanostructured metals and alloys. SPD fabricated nanostructures can lead to novel properties, which, however, depend strongly on the processing parameters. This paper focuses on examples of attaining enhanced mechanical properties in several metals and alloys, subjected to severe plastic deformation. In addition, the relationships among the processing conditions, microstructures and properties of the materials produced by SPD are considered.
Textures in Nanostructured Metals Processed by Severe Plastic Deformation
Alexandrov, Igor V.,Dubravina, Anna A.,Kilmametov, Ascar R.,Kazykhanov, Vil U.,Valiev, Ruslan Z. 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.2
This work demonstrates and analyzes the experimental results of the crystallographic texture formation processes in pure metals with a different type of crystal lattice, which were subjected to severe plastic deformation (SPD) applying various techniques such as high pressure torsion (HPT) and equal-channel angular pressing (ECAP).
Kim, J.G.,Enikeev, N.A.,Abramova, M.M.,Park, B.H.,Valiev, R.Z.,Kim, H.S. Elsevier 2017 Materials science & engineering. properties, micro Vol.682 No.-
<P><B>Abstract</B></P> <P>The initial grain size of TWIP steel can affect the deformation mechanism during the HPT processes and the mechanical properties of severely deformed TWIP steels, contrary to the common belief that responses to the severe plastic deformation of metallic materials are not affected by initial grain size.</P>
Microstructure, Texture and Mechanical Properties of Titanium Grade 2 Processed by ECAP (Route C)
M. Wroński,K. Wierzbanowski,D. Wojtas,E. Szyfner,R. Z. Valiev,J. Kawałko,K. Berent,K. Sztwiertnia 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
In the present work the properties of titanium grade 2 after ECAP processing with original route and regimes (route C, channelangle = 120°, deformation temperature 300 °C, number of passes up to 8) were examined. Texture development andmicrostructure parameters after ECAP processing and after recrystallization were determined using electron back scatterdiff raction and analysed. A signifi cant increase of the mechanical strength accompanied by some increase of ductility wasobserved in the deformed samples. The kernel average misorientation and average grain orientation spread were stronglyincreased after deformation, which confi rms the material refi nement and fragmentation. The proportion of low angle boundariesincreased after four ECAP passes, but after four consecutive passes high angle grain boundaries became predominant. Nodeformation twins were observed after four and eight ECAP passes. The material recrystallized after deformation retaineda fi ne grain microstructure. The textures of deformed and recrystallized samples were determined. It was found that textureafter 8 passes is more homogeneous that that after 4 passes, which partly explains higher ductility of this fi rst sample.