Relation between grain size and mechanical properties in commercially pure aluminium sheets (continued)

1957 ◽  
Vol 7 (1) ◽  
pp. 11-14
Author(s):  
Takashi IKENO
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Pure Aluminium ◽  
Commercially Pure ◽  
Aluminium Sheets

scholarly journals Texture and Microtexture of Pure (6N) and Commercially Pure Aluminum after Deformation by Extrusion with Forward-Backward Rotating Die (Kobo)

2016 ◽  
Vol 61 (1) ◽  
pp. 461-468 ◽  
Author(s):  
M. Bieda ◽  
S. Boczkal ◽  
P. Koprowski ◽  
K. Sztwiertnia ◽  
K. Pieła
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Electron Backscatter Diffraction ◽  
Pure Aluminum ◽  
Pure Aluminium ◽  
Commercially Pure ◽  
Transmission Electron ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Crystallographic Orientations

Pure aluminium (6N) and commercially pure aluminium (99.7) was deformed by KOBO method. Microstructure and texture of both materials after deformation was analyzed by means of scanning and transmission electron microscopy. Advanced methods of crystallographic orientations measurements like Electron Backscatter Diffraction - EBSD (SEM) and microdiffraction (TEM) was used. Grain size distribution and misorientation between grains in cross and longitudinal sections of the samples were analyzed. Differences in size and homogeneity of the grains were observed in both materials. Pure aluminium was characterized by larger grain size in both sections of extruded material. Whereas commercially pure aluminium reveals smaller grain size and more homogeneous and stable microstructure.

scholarly journals Novel Drawing System Approach To Manufacture Performant Commercially Pure Aluminium Fine Wires

2021 ◽  
Author(s):  
Serafino Caruso ◽  
Giuseppina Ambrogio
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Wire Drawing ◽  
Grain Structure ◽  
Pure Aluminium ◽  
Fine Grain ◽  
Commercially Pure ◽  
Drawing System ◽  
Aluminium Wire ◽  
Evolution Of Microstructure

Abstract Due to its electro-mechanical properties, commercially pure aluminium wires have attracted the interest of automotive industry representing a functional and efficient economic solution to reduce vehicle’s weight leading to the diminishing of energy consumption and emissions in today’s society. However, to consolidate its use in this sector and in new market realities, it is necessary to increase the flexibility of the aluminium conductor wires, consenting their installation in very small spaces and with high curvatures, avoiding any failure and electrical conductivity decrease. Thus, the evolution of microstructure and service performance need to be investigated and controlled to improve the service safety. The present research shows a new approach to efficiently continuously manufacture long wires with smaller diameters and fine grains at room temperature. It is studied the strengthening effects (yield and tensile strength, plasticity, hardness), the electrical conductivity and the microstructural changes of commercial 1370 pure aluminium (99.7% Al) when traditional wire drawing process is combined with equal channel angular drawing (ECAD) technique. The results of this proposed procedure of deformation “drawing-ECAD-drawing” show an evident benefit, compared to the classic technology of production of aluminium wire, obtaining fine grain structure product with superior mechanical strength and not influenced electrical conductivity. The proposed manufacturing approach leads to fine wires enhancing the material mechanical properties by microstructural evolution (i.e. grain size reduction) avoiding the traditional post manufacturing thermal treatments requiring a high amount of energy and time and careful steps.

FABRICATION OF NANOSTRUCTURED TUBE BY A NOVEL SPD PROCESS: ACCUMULATIVE SPIN-BONDING (ASB)

2012 ◽  
Vol 05 ◽  
pp. 342-349
Author(s):  
M. S. MOHEBBI ◽  
A. AKBARZADEH
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Optical Microscopy ◽  
Grain Refinement ◽  
Pure Aluminum ◽  
High Strength ◽  
Commercially Pure ◽  
Tension Tests ◽  
Average Grain Size

A novel SPD process for manufacturing high strength tubes and cylinders titled as accumulative spin-bonding (ASB) is proposed. This process is applied to a commercially pure aluminum up to four cycles and its effects on the microstructure and mechanical properties are examined by optical microscopy, TEM, microhardness and tension tests. The results show that ultra-fine grains are developed during the process leading to a nanostructure with average grain size in order of 150 nm. Mechanical properties indicate that while the hardness of outer layers is more than inner ones, the hardness and its homogeneity is increased by increasing the ASB cycles. As a result of grain refinement and the scheme of hardness development, the yield and tensile strength of material are increased significantly up to the values of 194 and 235 MPa, respectively.

scholarly journals Changes of Microstructures and Mechanical Properties in Commercially Pure Titanium after Different Cycles of Proposed Multi-Directional Forging

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 175 ◽  
Author(s):  
Zhanguang Zheng ◽  
Xiaoying Zhang ◽  
Liang Xie ◽  
Longgui Huang ◽  
Teng Sun
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Mechanical Test ◽  
Size Fraction ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Refinement Mechanism ◽  
Dislocations Density ◽  
Cp Ti

A newly proposed multi-directional forging (MDF) was successfully applied to a commercially pure titanium (CP Ti). Severe plastic deformation would result in significant and complex changes of microstructure and mechanical properties, so microstructure characterization and a mechanical test of CP Ti were conducted after different cycles of MDF. The results demonstrated that dynamic recrystallization was the dominant grain refinement mechanism of MDF CP Ti. With increasing the cycles of MDF, grain size, fraction of low angle grain boundaries and dislocations density decreased due to grain refined. After three cycles of MDF, the mean grain size was about 200 nm. The values of tensile strength and hardness increased significantly from zero cycles to one cycle of MDF, but increased slowly after one MDF cycle. Numerous dimples and tear ridges were present, but the dimples were smaller and shallower with increasing cycles of MDF.

scholarly journals Evolution of pitting corrosion resistance and mechanical properties in ultrafine-grained commercially pure aluminium during annealing

2021 ◽  
Author(s):  
Marta Orłowska ◽  
Ewa Ura-Bińczyk ◽  
Bogusława Adamczyk-Cieślak ◽  
Lech Olejnik ◽  
Małgorzata Lewandowska
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Mechanical Strength ◽  
Pitting Corrosion ◽  
Pure Aluminium ◽  
Commercially Pure ◽  
Intermetallic Particles ◽  
Pitting Corrosion Resistance ◽  
Ultrafine Grained ◽  
Deformed State

AbstractThe aim of the present study was to determine the evolution of resistance to pitting corrosion and changes in the mechanical properties of ultrafine-grained aluminium during annealing. In contrast to the numerous papers devoted to the topic of the corrosion resistance of severely deformed aluminium alloys, a unique approach has been taken in this study. The size and distribution of the primary intermetallic particles, which are crucial in terms of corrosion resistance, remain constant during annealing. Therefore, the influence of other microstructural features could be investigated and compare with the results of mechanical properties. It was shown that the ultrafine-grained structure of commercially pure aluminium was stable up to 200 °C. Higher annealing temperatures caused significant grain growth and a reduction in dislocation density, which resulted in a drop in mechanical strength. Also, the corrosion resistance slightly decreased, since with an increase in annealing temperature a decrease in the corrosion potential, pit size, and the area damaged by corrosion attack were noted. The best combination of mechanical strength and resistance to pitting corrosion has been achieved for as-deformed state.

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