Recrystallization Behavior of Aluminum Thin Foils with Various Purity

2016 ◽  
Vol 879 ◽  
pp. 648-652
Author(s):  
Hyun Woo Lee ◽  
Seok Hong Min ◽  
Tae Kwon Ha
Keyword(s):  
Cold Rolling ◽  
High Purity ◽  
Room Temperature ◽  
Al Alloy ◽  
Recrystallization Behavior ◽  
Time Intervals ◽  
Recrystallization Kinetics ◽  
Thin Foils ◽  
Aluminum Plates ◽  
Kinetics Of

Recrystallization kinetics of aluminum with various purities from 99.5 to 99.999(5N) has been investigated in this study. Aluminum plates of 10 mm thickness with various purities were solution-treated at 400oC for 24 hrs and then rolled into sheets of 50 μm thickness at room temperature. Cold rolling was conducted on samples with various purities from 99.9 to 99.999 including commercial AA 1050 Al alloy and high purity through about 20 passes to obtain thin foils of 50 μm thickness. Accumulative rolling was employed when sample thickness reached at 1 mm and thin foils were successfully obtained for all samples. Hardness was measured just after cold rolling at room temperature as a function of time up to 1hr to elucidated recrystallization behavior. For aluminum with 99.999% purity, recrystallization occurred after 200 s and finished at 360 s. Recrystallization kinetics of aluminum at high temperatures from 100 to 350oC were investigated by measure hardness after annealing thin foils for various time intervals ranging from 1 s to 24 hrs. For high purity sample with 99.999% purity, recrystallization finished just after 1 s even at the relatively low temperature of 100oC, while recrystallization of commercial AA 1050 (2N) alloy finished after 360 s at 350oC.

Role of deformation twins in static recrystallization kinetics of high-purity alpha titanium

2016 ◽  
Vol 22 (6) ◽  
pp. 1041-1048 ◽  
Author(s):  
Jong Woo Won ◽  
Taekyung Lee ◽  
Seong-Gu Hong ◽  
Yongmoon Lee ◽  
Jeong Hun Lee ◽  
...  
Keyword(s):  
High Purity ◽  
Static Recrystallization ◽  
Recrystallization Kinetics ◽  
Deformation Twins ◽  
Alpha Titanium ◽  
Kinetics Of

scholarly journals MICROSTRUCTURAL STUDY AND RECRYSTALLIZATION KINETICS OF DEFORMED COMMERCIAL COPPER WIRES

2018 ◽  
Vol 24 (1) ◽  
pp. 32 ◽  
Author(s):  
Lahcene Fellah ◽  
Abdallah Diha ◽  
Zakaria Boumerzoug
Keyword(s):  
Activation Energy ◽  
Room Temperature ◽  
Argon Atmosphere ◽  
Recrystallization Temperature ◽  
Heating Rates ◽  
Recrystallization Kinetics ◽  
Slip Bands ◽  
Commercial Copper ◽  
The One ◽  
Kinetics Of

This work aims to investigate the microstructure after cold-wiredrawing process of commercial copper and its recrystallization kinetics under isochronal annealing. In this paper, the samples studied are commercial copper wires reduced at six different reductions by a wiredrawing at room temperature. Optical microscopy, Scanning Electron Microscopy (SEM), and DSC were used as characterization techniques. The samples were annealed under Argon atmosphere with four different heating rates by using DSC. The Kissinger, Ozawa, Boswell, and Starink methods were used to determine the recrystallization kinetics. The results showed that the cold-wiredrawing had caused the elongation of grains along the main axis of the wires also showed the existence of slip bands. It has been found, on the one side, that the recrystallization temperature increased and shifted to higher temperatures as the heating rate increased, which means that this reaction is thermally actived; On the other sidethe recrystallization temperature clearly shifted to lower temperatures as the deformation increased, which indicated that recrystallization is profoundly enhanced by high deforming.We noted a decrease in the activation energy values when the reduction increases, the activation energy for the most reduced materials were lower than that in the less reduced wires.

scholarly journals INVESTIGATION OF SUPERPLASTIC BEHAVIOR OF CERTAIN (Zn – Al) ALLOYS

2019 ◽  
Vol 18 (4) ◽  
pp. 604-615
Author(s):  
Sora H Abed ◽  
Abdul Wahid K Rajih ◽  
Ahmed O Al-Roubaiy
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Room Temperature ◽  
Al Alloys ◽  
Al Alloy ◽  
Test Results ◽  
Superplastic Behavior ◽  
Partial Remelting ◽  
Hot Rolled ◽  
Hot Test

Super plasticity behavior finds applications in so many fields, for example the aerospacemanufacturing that is the main bazaar for super plasticity, but automotive, medical, sports,cookware and architectural applications have their share too. "In this work a study of thesuperplastic behavior of a new Zn-Al alloy was conducted. In addition to the investigation ofthe possible superplastic behavior of Zn-0.5Al alloy. These alloys were prepared by usinggravity and chill casting techniques. Zn-0.5Al alloy was subjected to hot rolling at 250 ºCand cold rolling at room temperature, while Zn-48Al alloy was also hot rolled at 250 ºC to20% reduction in the thickness of sample followed by partial remelting at 500 ºC. Severaltests were carried out such as physical, mechanical and chemical which include (XRF, XRD,OP, SEM, Microhardness (HV) and Tensile (cold, hot) test). Results showed that the"Zn-0.5Al alloy has poor mechanical properties and may not be regarded as a superplastic alloycompared with Zn-48Al alloy. The Zn-48Al alloy generally enhanced all properties. Themaximum elongation of (450%) was obtained in Zn-48Al alloy after thermomechanicalcontrolling process and partial remelting.

Significance of Si impurities on exceptional room-temperature superplasticity in a high-purity Zn-22%Al alloy

2015 ◽  
Vol 645 ◽  
pp. 47-56 ◽  
Author(s):  
Tokuteru Uesugi ◽  
Megumi Kawasaki ◽  
Masaki Ninomiya ◽  
Yuhei Kamiya ◽  
Yorinobu Takigawa ◽  
...  
Keyword(s):  
High Purity ◽  
Room Temperature ◽  
Al Alloy

Development of substructure in 1100 aluminum during cold rolling

1978 ◽  
Vol 36 (1) ◽  
pp. 596-597
Author(s):  
D.L. Rohr ◽  
S.S. Hecker
Keyword(s):  
Room Temperature ◽  
Mechanical Response ◽  
Large Strains ◽  
Plastic Response ◽  
Final Thickness ◽  
Commercially Pure ◽  
Thin Foils ◽  
Transmission Electron ◽  
Aluminum Plates ◽  
Comprehensive Study

The plastic response of metals at very large plastic strains is of considerable interest for practical and academic reasons. The question of the existence of a saturation stress remains largely unanswered because most experiments are not carried out to sufficiently large strains. In this paper we report our preliminary findings on the development of substructure in 1100 aluminum during rolling to reductions of 99.8%. This is part of a comprehensive study of microstructure and mechanical response of metals to large uniaxial and biaxial deformations.Commercially pure (1100) aluminum plates, annealed at 500°C, were rolled at room temperature from various starting thicknesses to a final thickness of 0.127 mm in a 2-high laboratory rolling mill. Sheets with final reductions ranging from 9.1 to 99.8% were examined by transmission electron microscopy. Thin foils were prepared directly from the 0.127-mm thick sheets by electropolishing with a 50cc-50cc-2cc HNO3-CH3OH-HCl solution in a jet polisher.

Tensile Property of Cold-Rolled Foils of Ni-Based and Co-Based L12 Intermetallic Alloys

2006 ◽  
Vol 980 ◽  
Author(s):  
Yasuyuki Kaneno ◽  
Takayuki Takasugi ◽  
Tadamichi Myoki
Keyword(s):  
Tensile Strength ◽  
Cold Rolling ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Tensile Elongation ◽  
Intermetallic Alloys ◽  
High Tensile Strength ◽  
Thermomechanical Process ◽  
Thin Foils ◽  
Cold Rolled

AbstractPolycrystalline L12-type Ni3(Si,Ti), Co3Ti and Ni3Al alloys prepared through the thermomechanical process from arc-melted ingots were successfully cold-rolled to thin foils with a thickness of below 200μm. The cold-rolling with over 90% reduction in thickness was possible without providing intermediate annealing. The cold-rolled foils showed high tensile strength (~2GPa) at room temperature due to heavily cold rolling although no plastic elongation was observed. Room temperature tensile elongation increased with increasing annealing temperature, and reached to ~30-40% by high temperature annealing at 1173K. Among three kinds of intermetallic alloys, the Ni3(Si,Ti) foil annealed around at 900K exhibited an extremely high tensile strength and yield strength (over 2GPa) with a reasonable tensile elongation. The observed tensile properties, especially tensile strength at low temperature for the present intermetallic foils were found to be superior to those for the conventional alloys such as nickel based alloys and stainless steels.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Effets of surfaces on precipitate morphology in irradiated thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 654-655
Author(s):  
D.I. Potter ◽  
A. Taylor
Keyword(s):  
Ion Irradiation ◽  
Dark Field Image ◽  
Thin Foil ◽  
Dark Field ◽  
Al Alloy ◽  
Bright Field Image ◽  
Dislocation Loops ◽  
Precipitate Morphology ◽  
Thin Foils

Thermal aging of Ni-12.8 at. % A1 and Ni-12.7 at. % Si produces spatially homogeneous dispersions of cuboidal γ'-Ni3Al or Ni3Si precipitate particles arrayed in the Ni solid solution. We have used 3.5-MeV 58Ni+ ion irradiation to examine the effect of irradiation during precipitation on precipitate morphology and distribution. The nearness of free surfaces produced unusual morphologies in foils thinned prior to irradiation. These thin-foil effects will be important during in-situ investigations of precipitation in the HVEM. The thin foil results can be interpreted in terms of observations from bulk irradiations which are described first.Figure 1a is a dark field image of the γ' precipitate 5000 Å beneath the surface(∿1200 Å short of peak damage) of the Ni-Al alloy irradiated in bulk form. The inhomogeneous spatial distribution of γ' results from the presence of voids and dislocation loops which can be seen in the bright field image of the same area, Fig. 1b.

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