scholarly journals Analysis of the surface-preparation effect on the hardness-measurement uncertainty of aluminium alloys

2020 ◽  
Vol 54 (6) ◽  
pp. 845-852
Author(s):  
A. Guštin ◽  
M. Sedlaček ◽  
B. Žužek ◽  
B. Podgornik ◽  
V. Kevorkijan
Keyword(s):  
Measurement Uncertainty ◽  
Aluminium Alloys ◽  
Surface Preparation ◽  
Hardness Measurement

A new ecologically clean technology for surface preparation of aluminium alloys for brazing

2001 ◽  
Vol 15 (6) ◽  
pp. 490-493
Author(s):  
E I Storchai ◽  
Yu V Gorbatskii ◽  
L S Lantushenko ◽  
A V Sokolova ◽  
Yu N Lantushenko
Keyword(s):  
Aluminium Alloys ◽  
Surface Preparation ◽  
Clean Technology

Processing and Characterization of AlCu Aluminium Alloys by the ECAE Method

2006 ◽  
Vol 114 ◽  
pp. 165-170 ◽  
Author(s):  
Marzenia Lech-Grega ◽  
S. Boczkal ◽  
J. Senderski ◽  
B. Płonka
Keyword(s):  
Aluminium Alloys ◽  
Equal Channel Angular Extrusion ◽  
Hardness Measurement ◽  
Structure And Properties ◽  
Structural Refinement ◽  
Powder Consolidation ◽  
Density Of Dislocations ◽  
Equiaxed Grains ◽  
Extrusion Method

Equal channel angular extrusion method (ECAE) was used to deform AlCu alloys in the range of true strains ε = 1.15 – 2.3. Samples for investigation were produced from extruded bars, conventionally manufactured and from a consolidated powder ingot. The influence of the strain on the structure was studied by using light microscopy and TEM and on properties by hardness measurement. Increased strain caused structural refinement of structure and increased hardness. The structure revealed the presence of the mutually crossing microbands, visible against the background of a high density of dislocations. After annealing, nearly equiaxed grains were formed. The material prepared by powder consolidation possessed greater hardness. The results revealed differences in structure and properties of nominally the same alloy, but processed differently, when subjected to deformation by ECAE

scholarly journals THE EFFECT OF COLD DEFORMATION AND ANNEALING PHENOMENA ON THE MICROSTRUCTURAL CHANGES AND MICRO-HARDNESS IN Al-Mg-Si ALUMINIUM ALLOYS

2020 ◽  
Vol 26 (3) ◽  
pp. 95-99
Author(s):  
Abdelouahab NOUA ◽  
Meryem GUEMINI ◽  
Toufik ZIAR ◽  
Hichem FARH ◽  
Rebai GUEMINI
Keyword(s):  
Aluminium Alloys ◽  
Low Cost ◽  
Cold Deformation ◽  
Hardness Measurement ◽  
Local Deformation ◽  
Micro Hardness ◽  
Transition Elements ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Deformation Level

Aluminium alloys are of particular interest because of their low density, low cost and ease of thermo-mechanical processing. During the recent years, much interest has been shown in the development of alloys with optimal mechanical properties which can be retained at high temperatures. The purpose of the present investigation is to study the microstructure of two Al-Mg-Si alloys containing transition elements after cold deformation 10%, 20 %, 30%, 40% and 50% reduction in thickness and annealing at 1 hour at different temperature by using the optical microscopy, transmission electron microscopic (TEM), Vickers hardness measurement. We notice that the micro-hardness increases with the increasing of the deformation level. The coarse particles, with a particle size of about 2 to 3 µm, give rise to a heavily local deformation of the Aluminium matrix. The formation of well-defined substructure due to the arrangement of dislocations is observed after an increase in annealing temperature.

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