scholarly journals Microstructure and Properties of Fine Grained Cu-Cr-Zr Alloys after Termo-Mechanical Treatments

2018 ◽  
Vol 54 (1) ◽  
pp. 56-92 ◽  
Author(s):  
A. Morozova ◽  
R. Mishnev ◽  
A. Belyakov ◽  
R. Kaibyshev
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Electric Conductivity ◽  
Nanocrystalline Structure ◽  
High Strength ◽  
Structure Property ◽  
Secondary Phases ◽  
Fine Grained ◽  
Structure Property Relationships ◽  
Zr Alloys

Abstract Cu-Cr-Zr alloys provide an excellent combination of strength and electric conductivity and are frequently used as engineering materials in various electric/electronic devises. The present review deals with the microstructural design of Cu-Cr-Zr alloys, their alloying concept, thermo-mechanical processing based on technique of severe plastic deformation, physical mechanisms responsible for high strength and electric conductivity. The influences of microstructure and a dispersion of secondary phases on the mechanical properties and electric conductivity are discussed in detail. First, precipitation sequences during aging that leads to depletion of Zr and Cr solutes from Cu solution are critically reviewed in close connection with interaction mechanisms between dislocations and particles. Then, the main structure-property relationships of Cu-Cr-Zr alloys are considered. Finally, the strengthening of Cu-Cr-Zr alloys through severe plastic deformation by means of submicrocrystalline/nanocrystalline structure and increasing dislocation density as well as the effects of post-deformation heat treatment on the mechanical and electric properties are discussed.

scholarly journals Strengthening of Copper by Using RCS Process and Optimization Through Taguchi Method

2019 ◽  
pp. 187-193
Author(s):  
Jwala Sudheer Reddy ◽  
U. Mahaboob Basha ◽  
L. Balasubramanyam ◽  
S. Jithendra Naik
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Optimization Technique ◽  
High Strength ◽  
Ultrafine Grain ◽  
Taguchi Optimization ◽  
Fine Grained ◽  
Safety And Reliability ◽  
Micro Parts

Severe plastic deformation (SPD) Processes is to be determined as metal forming processes in which a very large plastic strain is imposed on a bulk process in which to make an ultra-fine-grained metal. Generating an ultrafine grained metal is to allow lightweight parts by using high strength metal for the safety and reliability of micro-parts and for eco-friendly, is the main intention of SPD Processes. In Severe plastic deformation processes (SPD), repetitive corrugation and straightening (RCS) are one of the new technical processes, in which the grain size is reduced to ultrafine grain size then the strength of copper is going to be increased by using this process in this project. The Taguchi optimization technique is utilized with conventional orthogonal array L9, in which to determine the process parameters are statistically significant on hardness. Finally, the verification test was carried out to investigate optimization enhancements.

scholarly journals Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Hyun-Chae Loh ◽  
Thibaut Divoux ◽  
Bernd Gludovatz ◽  
Pupa U. P. A. Gilbert ◽  
Robert O. Ritchie ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Strain Energy ◽  
Functional Materials ◽  
High Strength ◽  
Hierarchical Level ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Brick And Mortar ◽  
Organic Matrices ◽  
Micro Indentation

Abstract Nacre’s structure-property relationships have been a source of inspiration for designing advanced functional materials with both high strength and toughness. These outstanding mechanical properties have been mostly attributed to the interplay between aragonite platelets and organic matrices in the typical brick-and-mortar structure. Here, we show that crystallographically co-oriented stacks of aragonite platelets, in both columnar and sheet nacre, define another hierarchical level that contributes to the toughening of nacre. By correlating piezo-Raman and micro-indentation results, we quantify the residual strain energy associated with strain hardening capacity. Our findings suggest that the aragonite stacks, with characteristic dimensions of around 20 µm, effectively store energy through cooperative plastic deformation. The existence of a larger length scale beyond the brick-and-mortar structure offers an opportunity for a more efficient implementation of biomimetic design.

Anisotropy of mechanical properties in high-strength ultra-fine-grained pure Ti processed via a complex severe plastic deformation route

2011 ◽  
Vol 64 (1) ◽  
pp. 69-72 ◽  
Author(s):  
I. Sabirov ◽  
M.T. Perez-Prado ◽  
J.M. Molina-Aldareguia ◽  
I.P. Semenova ◽  
G.Kh. Salimgareeva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Strength ◽  
Fine Grained ◽  
Anisotropy Of Mechanical Properties

Experimental Investigations of the Al 6082 Alloy Subjected to Equal-Channel Angular Pressing

2005 ◽  
Vol 473-474 ◽  
pp. 129-134
Author(s):  
György Krállics ◽  
Dmitry Malgyn ◽  
Arpad Fodor
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Relative Size ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Experimental Investigations ◽  
End Effects ◽  
Fine Grained ◽  
Angular Pressing ◽  
Element Simulation

The interest in bulk nanostructured materials (NSM), processed by methods of severe plastic deformation (SPD), is justified by their unique physical and mechanical properties. Equalchannel angular pressing (ECAP) is one of the methods of severe plastic deformation (SPD) that produces ultra fine-grained material. Due to the cyclic nature of the process, it is difficult to produce specimens with a high length to diameter ratio. Ratios of 6-7 have been reported in the literature to date. Longer specimens, however, are useful since the homogenous part is larger and the relative size of end effects is smaller. A new method was developed to obtain length to diameter ratios as high as 8-10. This new technique was developed using the multi-pass finite element simulation. The as-received alloy used in this study was the 6082 commercial Al-Mg-Si alloy. High strength and high ductility phenomenon that was found recently in materials after SPD were reached with the route C. The induced anisotropy of specimens after ECAP was monitored.

Role of Strain Gradient and Dynamic Transformation on the Formation of Nanocrystalline Structure Produced by Severe Plastic Deformation

2007 ◽  
Vol 539-543 ◽  
pp. 2787-2792 ◽  
Author(s):  
Minoru Umemoto ◽  
Yoshikazu Todaka ◽  
Jin Guo Li ◽  
Koichi Tsuchiya
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Strain Gradient ◽  
High Pressure Torsion ◽  
Large Strain ◽  
Nanocrystalline Structure ◽  
Angular Pressing ◽  
Dynamic Transformation ◽  
Fine Grained Structure

Formation of nanocrystalline structure by severe plastic deformation has studied extensively. Although ultra fine grained structure (grain size larger than 100 nm) had been obtained in many processes such as heavy cold rolling, equal channel angular pressing (ECAP) or accumulative roll bonding (ARB), the formation of nano grained structure (< 100 nm) is limited to processes such as ball milling, shot peening or drilling. In the present study, high pressure torsion (HPT) deformation and drilling were carried out to understand the conditions necessary to obtain nano grained structure in steels. The results of HPT experiments in pure Fe showed that HPT has superior ability of strengthening and grain refinement probably due to a strain gradient but the saturation of grain refinement occurs before reaching nano grained structure. Drilling experiments in high carbon martensitic steel revelaed that nano grained ferrite forms at the drilled hole surface only when the transformation from ferrite to austenite takes place during drilling. Considering various other processes by which nano grained ferrite was produced, it is proposed that heavy strains with large strain gradients together with dynamic transformation are necessary to reach nano grained ferrite structure.

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