scholarly journals A review on plastic deformation induced surface/interface roughening of sheet metallic materials

2021 ◽  
Author(s):  
Ning Nie ◽  
Lihong Su ◽  
Guanyu Deng ◽  
Huijun Li ◽  
Hailiang Yu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Metallic Materials ◽  
Interface Roughening

The Processing of Ultrafine-Grained Materials Using High-Pressure Torsion

2007 ◽  
Vol 558-559 ◽  
pp. 1283-1294 ◽  
Author(s):  
Cheng Xu ◽  
Z. Horita ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Metallic Materials ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Wide Range ◽  
Ultrafine Grained Materials ◽  
Thin Disks

It is now well-established that processing through the application of severe plastic deformation (SPD) leads to a significant reduction in the grain size of a wide range of metallic materials. This paper examines the fabrication of ultrafine-grained materials using high-pressure torsion (HPT) where this process is attractive because it leads to exceptional grain refinement with grain sizes that often lie in the nanometer or submicrometer ranges. Two aspects of HPT are examined. First, processing by HPT is usually confined to samples in the form of very thin disks but recent experiments demonstrate the potential for extending HPT also to bulk samples. Second, since the strains imposed in HPT vary with the distance from the center of the disk, it is important to examine the development of inhomogeneities in disk samples processed by HPT.

scholarly journals The Characteristics of Creep in Metallic Materials Processed by Severe Plastic Deformation

2019 ◽  
Vol 60 (8) ◽  
pp. 1506-1517 ◽  
Author(s):  
Petr Kral ◽  
Jiri Dvorak ◽  
Vaclav Sklenicka ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Metallic Materials

scholarly journals Plastic deformation of metallic materials during dynamic events

2018 ◽  
Vol 1063 ◽  
pp. 012054
Author(s):  
B. Revil-Baudard ◽  
G. Kleiser ◽  
N. Chandola ◽  
O. Cazacu
Keyword(s):  
Plastic Deformation ◽  
Metallic Materials ◽  
Dynamic Events

scholarly journals Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Ge Wu ◽  
Chang Liu ◽  
Ligang Sun ◽  
Qing Wang ◽  
Baoan Sun ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Structural Design ◽  
Flow Behavior ◽  
High Strength ◽  
Al Alloy ◽  
High Ductility ◽  
Metallic Materials ◽  
Trade Off ◽  
Ultrahigh Strength ◽  
Continuous Generation

Abstract High strength and high ductility are often mutually exclusive properties for structural metallic materials. This is particularly important for aluminum (Al)-based alloys which are widely commercially employed. Here, we introduce a hierarchical nanostructured Al alloy with a structure of Al nanograins surrounded by nano-sized metallic glass (MG) shells. It achieves an ultrahigh yield strength of 1.2 GPa in tension (1.7 GPa in compression) along with 15% plasticity in tension (over 70% in compression). The nano-sized MG phase facilitates such ultrahigh strength by impeding dislocation gliding from one nanograin to another, while continuous generation-movement-annihilation of dislocations in the Al nanograins and the flow behavior of the nano-sized MG phase result in increased plasticity. This plastic deformation mechanism is also an efficient way to decrease grain size to sub-10 nm size for low melting temperature metals like Al, making this structural design one solution to the strength-plasticity trade-off.

scholarly journals A New Experimental Method for Determining the Thickness of Thin Surface Layers of Intensive Plastic Deformation Using Electron Backscatter Diffraction Data

Symmetry ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 677
Author(s):  
Alexander Smirnov ◽  
Evgeniya Smirnova ◽  
Sergey Alexandrov
Keyword(s):  
Plastic Deformation ◽  
Electron Backscatter Diffraction ◽  
Thin Layers ◽  
New Method ◽  
Metallic Materials ◽  
Surface Layers ◽  
Kernel Average Misorientation ◽  
Electron Backscatter ◽  
Properties Of Materials ◽  
Backscatter Diffraction

It is, in general, essential to investigate correlations between the microstructure and properties of materials. Plastic deformation often localizes within thin layers. As a result, many material properties within such layers are very different from the properties in bulk. The present paper proposes a new method for determining the thickness of a thin surface layer of intensive plastic deformation in metallic materials. For various types of materials, such layers are often generated near frictional interfaces. The method is based on data obtained by Electron Backscatter Diffraction. The results obtained are compared with those obtained by an alternative method based on microhardness measurements. The new method allows for determining the layer thickness of several microns in specimens after grinding. In contrast, the measurement of microhardness does not reveal the presence of this layer. The grain-based and kernel-based types of algorithms are also adopted for determining the thickness of the layer. Data processed by the strain contouring and kernel average misorientation algorithms are given to illustrate this method. It is shown that these algorithms do not clearly detect the boundary between the layer of intensive plastic deformation and the bulk. As a result, these algorithms are unable to determine the thickness of the layer with high accuracy.

New Type of Device for Achievement of Grain Refinement in Metal Strip

2015 ◽  
Vol 1127 ◽  
pp. 91-97 ◽  
Author(s):  
Stanislav Rusz ◽  
Lubomír Čížek ◽  
Vít Michenka ◽  
Jan Dutkiewicz ◽  
Michal Salajka ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Cross Section ◽  
Circular Cross Section ◽  
Ultrafine Grain ◽  
Metallic Materials ◽  
Forming Process ◽  
Fine Grain ◽  
Extrusion Technology

DRECE - Dual Rolls Equal Channel Extrusion" (dual rolls pressure combined with equal channel extrusion) method is used for production of metallic materials with very fine grain size (hereinafter referred to as UFG structure - Ultrafine Grain Size). During the actual forming process the principle of severe plastic deformation is used. The device is composed of the following main parts: “Nord” type gearbox, electric motor with frequency speed converter, multi-plate clutch, feed roller and pressure rollers with regulation of thrust, and of the forming tool itself – made of Dievar steel type. Metallic strip with dimensions 58×2×1000 mm (width x thickness x length) is inserted into the device. During the forming process the main cylinder in synergy with the pressure roller extrude the material through the forming tool without any change of cross section of the strip. In this way a significant refinement of grain is achieved by severe plastic deformation. This method is used for various types of metallic materials, non-ferrous metals and their alloys. Forming process is based on extrusion technology with zero reduction of thickness of the sheet metal with the ultimate aim - achieving a high degree of deformation in the formed material. The DRECE device is also being verified from the viewpoint of achievement of a UFG structure in a blank of circular cross-section (wire) with diameter of ø 8 mm × 1000 mm (length).

Processing Different Magnesium Alloys through HPT

2014 ◽  
Vol 783-786 ◽  
pp. 2617-2622 ◽  
Author(s):  
Livia Raquel C. Malheiros ◽  
Roberto B. Figueiredo ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Structure Refinement ◽  
Hardness Distribution ◽  
Metallic Materials ◽  
Processing Conditions ◽  
Significant Structure

High-Pressure Torsion (HPT) is widely used to refine the structure of metallic materials through the use of severe plastic deformation. This technique is used in this report to process different magnesium alloys using various processing conditions. The high hydrostatic pressure allows processing of these materials at room temperature without cracking. The structure was characterized and hardness distribution was determined at different areas of the processed samples. The results show significant structure refinement and increased hardness. The evolution of the structure and hardness depends on the alloying and HPT processing conditions.

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