Thermal Stability of Microstructure and Properties of Cu-0.5Cr-0.2Zr Alloy Subjected to ECAP and Cold Rolling

2018 ◽  
Vol 385 ◽  
pp. 278-283
Author(s):  
Elena Sarkeeva ◽  
Marina M. Abramova ◽  
Wei Wei
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Plastic Deformation ◽  
Copper Alloys ◽  
Physical And Mechanical Properties ◽  
Initial State ◽  
Microstructure And Properties ◽  
Mechanical And Electrical Properties ◽  
Ultrafine Grained ◽  
Thermal Stability Of

Copper and copper alloys are widely used in engineering as structural materials because they have high electrical and thermal conductivity. In connection with the rapid growth of industry, special requirements are imposed on these materials, that is, they must withstand the contact mechanical loads without significant plastic deformation at elevated temperature and have stable high physical and mechanical properties. To improve the combination of strength, electrical conductivity, thermal stability, and wear resistance, low-alloyed Cu-Cr-Zr copper alloys have been subject to severe plastic deformation and aging. It the same time the analysis of the termo-stability of the formed ultrafine grained microstructure and properties is a topic task. In this work, a Cu-0.5Cr-0.2Zr (wt. %) alloy was quenched to form solid solution, equal channel angular pressed and cold rolled with following aging. The microstructure was studied, mechanical and electrical properties were also analyzed. The results showed that the ultimate strength of the Cu-Cr-Zr alloy increases with the degree of deformation at room temperature up to 630 MPa. Heat treatment at 450 ° C for 1 hour led to the precipitation of Cr and Cu5Zr particles, which increases the strength up to 660 MPa, which is 2.5 times greater than the initial state. At the same time, sufficient electrical conductivity of 70% IACS is maintained. The thermal stability of the microstructure and properties of the alloy are investigated. The reinforced alloy maintains stable the microstructure and microhardness at 450 ° C for at least 5 hours. The change in microhardness is no more than 10%. That is in agreement with the requirements of industry.

Evolution of Structure and Phase Composition of Aluminum Alloy under Severe Plastic Deformation

2014 ◽  
Vol 880 ◽  
pp. 179-183
Author(s):  
Evgeniy V. Naydenkin ◽  
Konstantin V. Ivanov ◽  
Gennadiy E. Rudenskii
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
S Phase ◽  
High Thermal Stability ◽  
Ultrafine Grained ◽  
Evolution Of Structure ◽  
Thermal Stability Of

The paper shows that high thermal stability of the ultrafine-grained structure of aluminum alloy produced by severe plastic deformation is related to S-phase particles. The sequence of phase transformations of zirconium-doped ultrafine-grained alloy Al-Mg-Li in heating is revealed. The paper also determines temperatures at which depending on crystal structure two types of S-phase particles can form.

scholarly journals Влияние термообработки на упругие и микропластические свойства ультрамелкозернистого титана с разным содержанием примесей

2019 ◽  
Vol 45 (22) ◽  
pp. 47
Author(s):  
Б.К. Кардашев ◽  
М.В. Нарыкова ◽  
В.И. Бетехтин ◽  
А.Г. Кадомцев ◽  
А.Ю. Токмачева-Колобова
Keyword(s):  
Thermal Stability ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Elevated Temperatures ◽  
Impurity Content ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Titanium Grade ◽  
Thermal Stability Of

The effect of elevated temperatures on elastic and microplastic properties of ultrafine-grained titanium prepared by severe plastic deformation is discussed. Three sets of a-titanium VT1-0, Grade-4 and PT3-V which differ each other in polycrystal structure and impurity content were investigated. As experiments show, significant changes in grain sizes, elastic and microplastic properties were observed only for the purest titanium VT1-0. The thermal stability of other sets of titanium (Grade-4 and PT3-V) was found to be better; it is explained by higher impurity content in these materials.

Structure and Properties of Ultrafine-Grained Cu-Cr Alloys after High Pressure Torsion

2010 ◽  
Vol 667-669 ◽  
pp. 301-306 ◽  
Author(s):  
D.V. Shangina ◽  
N.R. Bochvar ◽  
Sergey V. Dobatkin
Keyword(s):  
Thermal Stability ◽  
Chromium Content ◽  
High Pressure Torsion ◽  
Softening Temperature ◽  
Initial State ◽  
Resistivity Measurements ◽  
Chromium Alloys ◽  
Ultrafine Grained ◽  
The Stability ◽  
Thermal Stability Of

The effect of chromium content (0.75, 9.85, 27%) and initial state on the thermal stability of copper-chromium alloys after severe plastic deformation has been studied by microhardness and electrical resistivity measurements. The stability of the structures is established to depend on the initial state of the alloys and on the content of chromium phase. In the low-alloy bronze, quenching before HPT substantially increases the thermal stability of the alloy relative to that observed after annealing. The softening temperature increases with increasing chromium phase content and reaches 450°C for the alloy with 27% Cr.

scholarly journals Ultrafine-Grained High Strength Cu-Ni-Si Alloys

2017 ◽  
Vol 892 ◽  
pp. 64-69 ◽  
Author(s):  
Igor Altenberger ◽  
Hans Achim Kuhn ◽  
Mozhgan Gholami-Kermanshahi ◽  
Mansour Mhaede ◽  
Manfred Wollmann ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Copper Alloys ◽  
Pure Copper ◽  
High Strength ◽  
Solid Solution Hardening ◽  
Subsequent Aging ◽  
Ultrafine Grained ◽  
Wide Range

Ultrafine-grained (UFG) pure copper has been in the focus of materials scientists over the last two decades, however ultrafine-grained high-strength copper alloys have scarcely been processed or characterized so far industrially.In this contribution, UFG copper alloys, especially Cu-Ni-Si alloys, being well known as ideal materials for electromechanical connectors, springs and leadframes, are presented. Precipitation hardened Cu-Ni-Si alloys are a well established and technologically important class of materials for a wide range of applications where high strength and good conductivity are required. Yield strength and fatigue properties of metallic alloys can be significantly enhanced by severe plastic deformation methods. In contrast to other strengthening methods such as solid solution hardening, severe plastic deformation leads to a weaker decrease of electrical conductivity and is therefore a means of enhancing strength while maintaining acceptable conductivity for current bearing parts and components. Characterization of these materials after severe plastic deformation by swaging, wire drawing and subsequent aging was carried out using conductivity-, hardness-and tensile tests as well as highly-resolved microstructural characterization methods.The results reveal that UFG low alloyed copper alloys exhibit impressive combinations of properties such as strength, conductivity, high ductility as well as acceptable thermal stability at low and medium temperatures. By a subsequent aging treatment the severely plastically deformed microstructure of Cu-Ni-Si alloys can be further enhanced and thermal stability can profit from grain-boundary pinning by precipitated nanoscale nickel silicides.

Phase transformations of severely plastically deformed Ti–Ni–Pd high-temperature shape memory alloys

2017 ◽  
Vol 10 (01) ◽  
pp. 1740012 ◽  
Author(s):  
Semir Tulić ◽  
Michael Kerber ◽  
Mitsuhiro Matsuda ◽  
Thomas Waitz
Keyword(s):  
Thermal Stability ◽  
Plastic Deformation ◽  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Amorphous Phase ◽  
Ultrafine Grained ◽  
Small Grains ◽  
Thermal Stability Of

Severe plastic deformation of a Ti[Formula: see text]Ni[Formula: see text]Pd[Formula: see text] high-temperature shape memory alloy yields a nanoscale mixture of an amorphous phase and retained lamellae of the parent B19 martensite. The thermal stability of the deformed martensite is significantly enhanced. Upon heating, B2 austenite occurs within the martensite and by crystallization of the amorphous phase, concomitant with recovery and the formation of an ultrafine grained structure. In the small grains, the B2 austenite to B19 martensitic transformation is shifted to lower temperatures and incomplete.

Influence of plastic deformation on thermal stability of low carbon bainitic steel

2015 ◽  
Vol 22 (1) ◽  
pp. 60-66 ◽  
Author(s):  
Chao Sun ◽  
Shan-wu Yang ◽  
Rui Zhang ◽  
Xian Wang ◽  
Hui Guo
Keyword(s):  
Thermal Stability ◽  
Plastic Deformation ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Thermal Stability Of

Texture Development in a Model Al-Li Alloy Subjected to Severe Plastic Deformation

2006 ◽  
Vol 114 ◽  
pp. 337-344 ◽  
Author(s):  
Bogusława Adamczyk-Cieślak ◽  
Jaroslaw Mizera ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Extrusion ◽  
Orientation Distribution ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
Initial State ◽  
Texture Characteristic ◽  
X Ray ◽  
Ultrafine Grained

The texture of Al – 0.7 wt. % Li alloy processed by two different methods of severe plastic deformation (SPD) has been investigated by X-ray diffraction, and analyzed in terms of the orientation distribution function (ODF). It was found that severe plastic deformation by both Equal Channel Angular extrusion (ECAE) and Hydrostatic Extrusion (HE) resulted in an ultrafine grained structure in an Al – 0.7 wt. % Li alloy. The microstructure, grain shape and size, of materials produced by SPD strongly depend on the technological parameters and methods applied. The texture of the investigated alloy differed because of the different modes of deformation. In the initial state the alloy exhibited a very strong texture consisting of {111} fibre component. A similar fibrous texture characteristic was also found after HE whereas after the ECAE the initial texture was completely changed.

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