Three Surface TEM Observations of Cold Rolled 1100 Aluminum

1981 ◽  
Vol 39 ◽  
pp. 50-51
Author(s):  
D. L. Rohr ◽  
S. S. Hecker
Keyword(s):  
Room Temperature ◽  
Rolling Direction ◽  
Plastic Strains ◽  
Thickness Direction ◽  
Sheet Surface ◽  
Thin Foils ◽  
Cold Rolled ◽  
Rolled Plates

As part of an on-going study of 1100 Al at large plastic strains, we have examined cold-rolled samples from three orientations; through the sheet surface, and in the thickness direction along the rolling direction (RD) and transverse to the RD. Cell and subgrain sizes were determined in the same manner as for the earlier work.The starting plates of 1100 Al were annealed at 500 C and then rolled at room temperature to various thicknesses. These rolled plates were used to produce final samples rolled to 0.5 mm thickness with 62, 80, and 90% reductions. Thin foils were produced by lapping and jet electropolishing. A method was developed to make thin foils perpendicular to the sheet by lapping small pieces of sheet (1 mm wide) edgewise from both edges. This produces sheet 0.25 mm thick by 0.5 mm wide which were mounted between two 0.25-mm-thick 1100 Al disks 3 mm in dia. These disks had been slitted in the center to have slits ≪ 0.5 mm wide.

Microstructures and Tensile Properties of Cold-rolled Thin Foils of Binary Ni-Al γ/γ' Alloys

2002 ◽  
Vol 753 ◽  
Author(s):  
Dingqiang Li ◽  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Yozo Suga ◽  
Toshiyuki Hirano
Keyword(s):  
Room Temperature ◽  
Small Difference ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Two Phase ◽  
Band Formation ◽  
Fracture Elongation ◽  
Thin Foils ◽  
Cold Rolled ◽  
Very High

ABSTRACTThree single crystal plates of γ/γ' Ni-Al two-phase alloys with near cube, Goss and intermediate orientations between cube and Goss were cold-rolled to 300 μm-thick foils with 83% reduction. Tensile tests of the foils were performed at room temperature to study the effect of rolling microstructures and textures on the mechanical properties. The fracture strength of all the foils was very high, 1.4–1.7 GPa, having a small initial normal direction (ND) dependence and a small difference between rolling direction (RD) and transverse direction (TD). The foils fabricated from initial cube and intermediate orientations showed necking and a small fracture elongation when tensile-tested along RD, while the foil fabricated from initial Goss orientation did not show necking and fracture elongation. All the foils showed small fracture elongations due to shear band formation when tensile-tested along TD.

Structure and Mechanical Properties of Asymmetrically Rolled IF Steel Sheet

2010 ◽  
Vol 654-656 ◽  
pp. 1255-1258 ◽  
Author(s):  
Dmitry Orlov ◽  
Rimma Lapovok ◽  
László S. Tóth ◽  
Ilana B. Timokhina ◽  
Peter D. Hodgson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Steel Sheet ◽  
Rolling Direction ◽  
If Steel ◽  
Asymmetric Rolling ◽  
Cold Rolled ◽  
Hot Rolled ◽  
If Steel Sheet

As-received hot-rolled 5.6 mm thick IF steel sheet was symmetrically/asymmetrically cold rolled at room temperature down to 1.9 mm. The asymmetric rolling was carried out in monotonic (an idle roll is always on the same side of the sheet) and reversal (the sheet was turned 180º around the rolling direction between passes) modes. Microstructure, texture and mechanical properties were analysed. The observed differences in structure and mechanical properties were modest, and therefore further investigation of the effects of other kinds of asymmetry is suggested.

scholarly journals Deformation Zone Geometry and Texture Gradients in Cold-Rolled Niobium

1977 ◽  
Vol 2 (3) ◽  
pp. 183-203 ◽  
Author(s):  
R. A. Vandermeer ◽  
J. B. Bernal
Keyword(s):  
Deformation Zone ◽  
Room Temperature ◽  
Contact Length ◽  
Theoretical Explanation ◽  
Thickness Direction ◽  
X Ray ◽  
Total Reduction ◽  
Pole Figures ◽  
Cold Rolled ◽  
The Mean

Several niobium plates were cold-rolled at room temperature to a total reduction of 60% maintaining the geometry of the zone of deformation constant for each plate. Pole figures were obtained by means of the Schulz x-ray reflection technique from various depths in the thickness direction for plates rolled with different ∆, the ratio of the mean height of the deformation zone to its contact length. Severe texture gradients were noted and characterized for Δ>1; a modified texture different from the normal texture was observed at intermediate through-the-thickness locations. Both lateral widening and microhardness gradients were also in evidence for this case. No previously proposed theoretical explanation could account for these results.

On the disappearance of fine, disc-like features from thin foils of steel

1991 ◽  
Vol 49 ◽  
pp. 608-609
Author(s):  
S. W. Thompson
Keyword(s):  
Room Temperature ◽  
Sheet Steel ◽  
Rolled Sheet ◽  
Steel Company ◽  
Thin Foils ◽  
Transmission Electron ◽  
Fine Carbide ◽  
Iced Water ◽  
Cold Rolled ◽  
Carbide Particles

Fine carbide particles form in quenched-and-aged specimens of iron containing a small amount of carbon. Similar precipitation occurs in ferrite grains within dual-phase steels. The particles have been described as discs or loops, typically about 20 run in diameter and 2 nm thick, which lie on ﹛100﹜ planes within ferrite grains. The precipitates are believed to form in association with vacancies and produce increases in hardness and yield strength. Two studies showed that these features disappeared after heating specimens in the transmission electron microscope (TEM), and this note reports further on this phenomenon.Continuously annealed and cold-rolled sheet steel (provided by Inland Steel Company) contained (in wt pet) 0.087 C, 0.97 Mn, 0.27 Si, 0.034 Al, 0.008 S, and 0.005 N. Specimens were intercritically annealed at 770°C for five minutes and quenched in iced water. Tensile testing was conducted within one day of heat treatment, and then specimens were stored at room temperature for about six months. Thin foils were produced by conventional thinning methods and jet polished at 75 V and 80 mA in an electrolyte containing 95% acetic acid and 5% perchloric acid. Specimens were examined in a Philips EM400 operated at 120 kV.

Annealing of Cold-Rolled Fe-40A1 Single Crystals

1996 ◽  
Vol 460 ◽  
Author(s):  
Y. Yang ◽  
I. Baker
Keyword(s):  
Single Crystals ◽  
Differential Scanning Calorimeter ◽  
Room Temperature ◽  
Plastic Strains ◽  
Temperature Ranges ◽  
Cold Rolled

ABSTRACTSingle crystals of Fe-40A1 were cold-rolled to plastic strains in the range 5% to 48%. Discs cut from the rolled crystals at different rolling strains were heated at 10 K/min in a differential scanning calorimeter from room temperature to 973 K. Three exothermic peaks were observed in the temperature ranges of 440–550 K, 610–650 K, and 860–930 K, all the peaks shifting to lower temperatures with increasing strain. The origins of these peaks are discussed in terms of the disorder and vacancies introduced during rolling.

The Effects of Nb and Cr Addition on Mechanical and Chemical Properties of Cold-Rolled Ni3(Si,Ti) Intermetallic Foils

2007 ◽  
Vol 561-565 ◽  
pp. 411-414 ◽  
Author(s):  
Yasuyuki Kaneno ◽  
Takayuki Takasugi
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Room Temperature ◽  
Chemical Properties ◽  
Solid Solution Phase ◽  
Two Phase ◽  
Thermomechanical Process ◽  
Thin Foils ◽  
Cold Rolled ◽  
High Temperature Tensile

Nb and/or Cr added Ni3(Si,Ti) as well as unalloyed Ni3(Si,Ti) intermetallic thin foils (i.e., Ni3(Si,Ti), Ni3(Si,Ti)+Nb, Ni3(Si,Ti)+Cr and Ni3(Si,Ti)+Nb,Cr) were fabricated from arc-melted polycrystalline ingots by thermomechanical process and subsequent heavy cold-rolling. Tensile property at room temperature as well as at high temperature and oxidization behavior of the cold-rolled foils with a thickness of ~200μm were investigated. The Ni3(Si,Ti) and Ni3(Si,Ti)+Nb alloys showed a single-phase microstructure consisting of L12 phase, while the Ni3(Si,Ti)+Cr and Ni3(Si,Ti)+Nb,Cr alloys exhibited a two-phase microstructure with A1 (fcc) Ni solid solution phase within the L12 grains. All the cold-rolled foils showed high tensile strength (over 2GPa) at room temperature although no plastic elongation was observed. The addition of Nb and/or Cr slightly enhanced the room-temperature tensile strength of the Ni3(Si,Ti) alloy. On the other hand, the addition of Nb and/or Cr prominently enhanced high-temperature tensile strength as well as oxidization resistance, while the addition of Cr improved high-temperature elongation.

Orientation Dependence of the Texture Evolution in Cold-Rolled Thin Foils of Ni3Al Single Crystals

2002 ◽  
Vol 753 ◽  
Author(s):  
Kyosuke Kishida ◽  
Masahiko Demura. Yozo Suga ◽  
Toshiyuki Hirano
Keyword(s):  
Single Crystals ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Rolling Texture ◽  
Orientation Dependence ◽  
Microstructure Observation ◽  
Thin Foils ◽  
Cold Rolled ◽  
Macroscopic Shape ◽  
Initial Crystal

ABSTRACTTexture evolutions of cold-rolled thin foils of binary stoichiometric Ni3Al single crystals were examined as a function of the initial crystal orientation. In the cases of the initial rolling direction (RD) close to <001>, the rolling texture above 90% reduction is composed of two {110}<112> textures, which resulted from the formation of the banded structure with two types of differently oriented matrix bands. The macroscopic shape of these cold-rolled foils is straight and simply elongated along RD keeping their rectangular shape. In contrast, when the initial RD is close to <112>, the texture and the microstructure are rather uniform but the foils are curved, twisted, and eventually cracked from the side edge of the samples. Based on the analysis of the texture evolution and the microstructure observation, the operative slip systems were determined.

Strain-Hardening Behavior of Mg-Li-Zn Alloy Thin Sheets under Tension

2010 ◽  
Vol 146-147 ◽  
pp. 1361-1364 ◽  
Author(s):  
Horng Yu Wu ◽  
Pin Hou Sun ◽  
Chui Hung Chiu ◽  
Geng Zhong Zhou
Keyword(s):  
Strain Hardening ◽  
Room Temperature ◽  
Rolling Direction ◽  
Tensile Tests ◽  
Alloy Sheet ◽  
Stage Ii ◽  
Cold Rolled ◽  
Strain Hardening Behavior ◽  
Zn Alloy ◽  
Li Content

This work examined the effects of Li content on the strain-hardening behaviors of three varieties of Mg−Li−Zn alloys containing approximately 6 wt%, 9 wt%, and 10 wt% of Li. Tensile tests were carried out on specimens in the directions of 0, 45 and 90° to the rolling direction. Kocks–Mecking type plots were constructed to illustrate different stages of strain-hardening. The cold-rolled Mg−6Li−1Zn (designated as LZ61) alloy sheet showed stage II and stage III strain-hardening behaviors at room temperature. The specimens of Mg−9Li−1Zn (designated as LZ91) and Mg−10Li−1Zn (designated as LZ101) alloy sheets did not show stage II strain-hardening. Higher initial strain-hardening rates were observed in the 90° direction for these alloys as a result of the cold-rolled fibrous structure affording stronger barriers to dislocation movements in this direction.

Room-temperature mechanical properties of cold-rolled thin foils of binary, stoichiometric Ni3Al

2002 ◽  
Vol 33 (8) ◽  
pp. 2607-2613 ◽  
Author(s):  
Masahiko Demura ◽  
Kyosuke Kishida ◽  
Toshiyuki Hirano ◽  
Yozo Suga
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Thin Foils ◽  
Cold Rolled

THE DEVELOPMENT OF THE MICROSTRUCTURE AND TEXTURE IN COLD ROLLED AZ31 MG ALLOY SHEETS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5925-5930 ◽  
Author(s):  
INSOO KIM ◽  
SAIDMUROD AKRAMOV
Keyword(s):  
Magnesium Alloy ◽  
Optical Microscopy ◽  
Room Temperature ◽  
Rolling Direction ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Sheet Metals ◽  
X Ray ◽  
Az31 Mg Alloy ◽  
Cold Rolled

Formability is very important parameter of magnesium alloy sheets and it would be related to the texture of sheet metals. In this study, magnesium alloy sheets with strong {0002} texture were cut along the angles of 0, 12.5, 25 and 37.5 degrees to rolling direction (RD). Prepared samples were rolled at room temperature condition. Cold rolled AZ31 magnesium alloy sheets along the angles of 0, 12.5, 25, 37.5 and 45 degrees to rolling direction were investigated microstructure and texture with optical microscopy and x-ray diffractometer, respectively.

Sign in / Sign up

Export Citation Format

Share Document