scholarly journals Enhancement of First Hydrogenation of Ti1V0.9Cr1.1 BCC Alloy by Cold Rolling and Ball Milling

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3106
Author(s):  
Salma Sleiman ◽  
Anis Aliouat ◽  
Jacques Huot
Keyword(s):  
Cold Rolling ◽  
Ball Milling ◽  
Mechanical Treatment ◽  
Room Temperature ◽  
Milling Time ◽  
Storage Capacity ◽  
Cast Alloy ◽  
Body Centered Cubic ◽  
Hydrogen Capacity ◽  
Cold Rolled

In this study, we evaluated the effects of a mechanical treatment by cold rolling (CR) and ball milling (BM) on the first hydrogenation of Ti1V0.9Cr1.1 alloy. The as-cast alloy has a body-centered cubic (BCC) crystal structure, and the first hydrogenation at room temperature under 20 bars of hydrogen is practically impossible. However, the samples mechanically activated by CR or BM readily absorbed hydrogen. The sample cold-rolled for one pass exhibited faster kinetics than the sample ball-milled for five minutes, but both samples reached the same storage capacity of 3.6 wt % hydrogen. Increasing the amount of rolling or the milling time decreased the hydrogen capacity. CR is considered the best and most efficient method for the activation of Ti1V0.9Cr1.1 alloy.

Effect of Annealing Treatment on the Properties of Cold Rolled Copper Foil

2018 ◽  
Vol 921 ◽  
pp. 231-235
Author(s):  
Ke Bin Sun ◽  
Yan Feng Li ◽  
Ye Xin Jiang ◽  
Guo Jie Huang ◽  
Xue Shuai Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cold Rolling ◽  
Copper Foil ◽  
Room Temperature ◽  
Annealing Treatment ◽  
Test Machine ◽  
Cold Rolled ◽  
Rolled Copper Foil ◽  
Fracture Morphologies

Copper foils with 91% cold rolled deformation annealed at temperature between 140°C and 170 °C.The microstructures were observed by EBSD. The mechanical properties were measured at room temperature by tensile test machine and the fracture morphologies observed by SEM. After annealed at 150 °C, recrystallization begins to occur, while the elongation increases evidently and tensile strength decreases sharply. When the temperature rises to 170 °C, recrystallization is complete and the grain starts to grow. When the foils are annealed at 140 °C, it exhibits a strong cold rolling textures characterized by Brass {011}<211> and Cu {112}<111>. After annealed at 170 °C, there are olny weak Brass {011}<211> texture.

A Method for the Production of Large Sized Al-B4C-Al2O3np Nanocomposites through Liquid-State Process

2017 ◽  
Vol 753 ◽  
pp. 84-92
Author(s):  
Wei Liu ◽  
Qiu Lin Li ◽  
Wei Liu ◽  
Guo Gang Shu ◽  
Qi Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Ball Milling ◽  
Liquid State ◽  
Room Temperature ◽  
Milling Time ◽  
Mixed Powder ◽  
State Process ◽  
Semi Solid

The paper introduces a new method to produce large sized Al-B4C-Al2O3np composites, which combines ball milling to prepare Al2O3np/Al mixed powder and semi-solid casting to contribute the injection of Al2O3np/Al mixed powder into the melt. The deformation performance of Al2O3np and micro-Al through ball milling with different Al/Al2O3np ratios, different milling time and different balls were studied respectively. It was revealed that micro-Al particles were milled from twisted and crimpled foil pieces to shuttles with Al2O3np embedded on it through 4h milling with 10mm balls. And we consider it as the best bonding between Al2O3np and micro-Al we could attain. And a plate of 25kg of Al-B4C-Al2O3np composite was fabricated successfully with the injection of the Al2O3np/Al mixed powder. Spherical Al2O3np of 300nm and needle-like TiB2 with 200nm in radius and 800nm-4μm in length were found in SEM photographs. Tensile properties of Al-B4C-Al2O3np composites were tested at room temperature and high temperature. It was showed higher mechanical properties than Al-B4C composites at room temperature and elevated temperature. Particularly, a 40% increase of UTS of Al-15wt.% B4C-1wt.%Al2O3np at 350°C was observed.

Martensitic Transformation and Mechanical Properties of Fe-added Au-Cu-Al Shape Memory Alloy with Various Heat Treatment Conditions

2014 ◽  
Vol 1760 ◽  
Author(s):  
Akira Umise ◽  
Masaki Tahara ◽  
Kenji Goto ◽  
Tomonari Inamura ◽  
Hideki Hosoda
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Shape Memory ◽  
Yield Stress ◽  
Mechanical Treatment ◽  
Tensile Tests ◽  
Treatment Temperature ◽  
Shape Memory Properties ◽  
Cold Rolled ◽  
Thermo Mechanical Treatment

ABSTRACTIn order to improve shape memory properties of Au-Cu-Al based shape memory alloys, the possibility to utilize thermo-mechanical treatment was investigated in this study, and effects of heat-treatment temperature on microstructure, martensitic transformation and mechanical properties of cold-rolled Au-30Cu-18Al-2Fe (AuCuAlFe) alloy were clarified by X-ray diffraction analysis (XRD, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and tensile tests at room temperature (RT). Here, Fe addition to AuCuAl improves ductility. Cold rolling with the thickness reduction of 30% was successfully carried out in AuCuAlFe at RT. An exothermic heat was observed in DSC at temperature from 402K, suggesting that recovery started at 402K. Besides, the transformation temperature hysteresis increased by the cold-rolling. The alloy was completely recrystallized after the heat treatment at 573K for 3.6ks. Tensile tests revealed that the yield stress was raised by cold rolling and largely by the subsequent heat treatment at 433K, which corresponded to the recovery start temperature by DSC. The yield stress decreased with increasing heat treatment temperature over 453K, probably due to recrystallization. AuCuAlFe cold-rolled and subsequent heat-treated at 573K exhibited the lowest yield stress as well as stress-plateau region, indicating that the thermo-mechanical treatment is effective to improve shape memory properties of Au-Cu-Al based alloys.

scholarly journals Effect of cold-rolling on mechanical properties of Haynes 25 cobalt-based superalloy

10.30544/248 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 31-45 ◽  
Author(s):  
Padina Ajami Ghaleh Rashidi ◽  
Hossein Arabi ◽  
Seyed Mehdi Abbasi
Keyword(s):  
Cold Rolling ◽  
Tensile Properties ◽  
Annealing Time ◽  
Room Temperature ◽  
Crack Nucleation ◽  
Microstructural Analysis ◽  
Time Range ◽  
High Annealing ◽  
Cold Rolling And Annealing ◽  
Cold Rolled

Effect of cold-rolling and annealing time on the microstructure, hardness and the tensile properties of Haynes 25 superalloy at room-temperature and 760 °C were investigated in this research. Hot-rolled and solutionized alloy of Haynes 25 was subjected to cold-rolling with different amounts of reductions, i.e. 5%, 10%, 20%, 30% and 35%. After that, all cold-rolled samples were annealed at 1230 °C for a period of time from 2 to 120 min. Microstructural analysis showed that for annealing time range from 30 to 120 min, the rate of grains coarsening remained approximately stable in all cold-rolled samples. On the other hand, the hardness results showed that expected decreasing trend of hardness did not occur after annealing of the cold-rolled samples at 1230 °C; on the contrary, hardness increased moderately in the range time from 10 to 120 min. Tensile properties after annealing of the cold-rolled samples at room temperature and 760 °C decreased. Loss of the tensile properties can be related to the high annealing temperature. According to the experimental results, decreasing trend of tensile properties and increasing trend of hardness is linked to the formation of hcp phase after annealing at 1230 °C for 30 min. Even though the hcp phase is a hard phase, the interface between fcc and hcp phases provides suitable sites for crack nucleation and propagation.

Effect of Warm-Rolling on the Formation of Microstructure and Microtexture of the Constituent Phases in a Duplex Steel

2014 ◽  
Vol 783-786 ◽  
pp. 2555-2560 ◽  
Author(s):  
Prasad Bhattacharjee Pinaki ◽  
Zaid Ahmed Mohammed
Keyword(s):  
Cold Rolling ◽  
Room Temperature ◽  
Volume Fraction ◽  
Warm Rolling ◽  
Pure Metal ◽  
Steel Plates ◽  
Duplex Steel ◽  
Cold Rolled ◽  
Evolution Of Microstructure ◽  
Microstructure And Microtexture

The effect of warm-rolling on the evolution of microstructure and microtexture was investigated in a duplex steel. For this purpose annealed duplex steel plates were cold and warm-rolled up to 90% reduction in thickness at room temperature and at 625°C, respectively. The austenite volume fraction decreased consistently during cold-rolling indicating that austenite was not stable during cold-rolling. In contrast, austenite was found to be very stable during warm-rolling at 625°C. Development of an ultrafine lamellar deformation structure with alternate arrangement of the ferrite and austenite bands could be observed during warm-rolling. A strong pure metal or copper type texture was observed in the austenite in the warm-rolled material in contrast to brass texture developed during cold-rolling. Development of RD (RD//<110>) fiber and ND-fiber (ND//<111>) was observed in ferrite during both cold and warm-rolling. However, the strength of the RD-fiber was much higher as compared to the ND-fiber in ferrite in cold-rolled DSS as compared to the ferrite in warm-rolled DSS.

Metallic Hydrides III: Body-Centered-Cubic Solid-Solution Alloys

MRS Bulletin ◽  
2002 ◽  
Vol 27 (9) ◽  
pp. 699-703 ◽  
Author(s):  
E. Akiba ◽  
M. Okada
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Laves Phase ◽  
Body Centered Cubic ◽  
Equilibrium Pressure ◽  
Hydrogen Capacity ◽  
Structure And Morphology ◽  
Bcc Metals

AbstractHydrogen-absorbing alloys with bcc (body-centered-cubic) structures, such as Ti-V-Mn, Ti-V-Cr, Ti-V-Cr-Mn, and Ti-Cr-(Mo, Ru), have been developed since 1993. These alloys have a higher hydrogen capacity (about 3.0 mass%) than conventional intermetallic hydrogen-absorbing alloys. Generally, bcc metals and alloys exhibit two plateaus in pressure–composition isotherms, but the lower plateau is far below atmospheric pressure at room temperature. Many efforts have been made to increase hydrogen capacity and raise the equilibrium pressure of this lower plateau. The crystal structure and morphology of Laves-phase-related bcc solid-solution alloys are reviewed.

Cold-Rolling and Subsequent Annealing of Ti-Rich Tial Polysynthetically Twinned (PST) Crystals

1990 ◽  
Vol 213 ◽  
Author(s):  
M.H. Oh ◽  
H. Inui ◽  
S.R. Nishitani ◽  
M. Yamaguchi
Keyword(s):  
Dislocation Density ◽  
Cold Rolling ◽  
Shear Deformation ◽  
Lamellar Structure ◽  
Room Temperature ◽  
Subsequent Annealing ◽  
Second Stage ◽  
Cold Rolled ◽  
Two Stages ◽  
Equiaxed Grains

ABSTRACTPolysynthetically twinned (PST) crystals of Ti-rich TiAl have been grown and specimens cut from these crystals have been rolled at room temperature and subsequently annealed at 900°C and 1000°C. When the shear deformation parallel to the lamellar boundaries occurs during rolling, PST crystals of Ti-rich TiAl can be rolled to about 50% reduction in thickness at room temperature.The recovery in microhardness occurs in two stages; the first stage associated with the decrease in dislocation density and the second stage connected with the annealing-out of deformation induced twins. The recrystallization mode depends on the amount of reduction. Up to 20% reduction, the lamellar structure is preserved even after the full recovery in hardness. When the amount of reduction exceeds 40%, a structure composed of equiaxed grains of TiAl is obtained after recrystallization. A mechanism of recrystallization of cold-rolled PST crystals, which may explain the dependence of recrystallization mode on the amount of reduction, is proposed.

High Temperature Phase Transformation in a Cold-Rolled Fe-Mn-Si Alloy

2013 ◽  
Vol 803 ◽  
pp. 243-246
Author(s):  
Z.C. Zhou ◽  
D.K. Yang ◽  
J. Du ◽  
Y.J. Yan ◽  
S.Y. Gu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Internal Friction ◽  
Cold Rolling ◽  
Forced Vibration ◽  
Room Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Internal Friction Peak ◽  
Cold Rolled

The internal friction of a cold-rolled Fe-Mn-Si alloy has been investigated using a multifunctional internal friction apparatus though forced vibration method from room temperature to 950 °C. It has been shown that an internal friction peak is found on the IF-T curves during first heating at around 640 °C for the cold-rolled Fe-Mn-Si alloy. The internal friction peak is confirmed to be crystallizing peak of amorphous. The amorphous is resulted from the cold-rolling of the Fe-Mn-Si alloy.

Grain Refinement Performance of Aluminium Cast-Alloy by Deformed Al-Al3Ti Alloy Refiner

2006 ◽  
Vol 519-521 ◽  
pp. 1859-1864 ◽  
Author(s):  
Hisashi Sato ◽  
Kentaro Ota ◽  
Yoshimi Watanabe ◽  
Zuo Gui Zhang ◽  
Kaneaki Tsuzaki
Keyword(s):  
Cold Rolling ◽  
Grain Refinement ◽  
Cast Alloy ◽  
Hardness Test ◽  
Reduction Ratio ◽  
Ti Alloy ◽  
Before And After ◽  
Mean Size ◽  
Cold Rolled ◽  
Strength Improvement

Grain refining experiments for casting of pure Al were conducted to evaluate the grain refinement performance of an Al-5mass%Ti alloy refiner before and after cold rolling. Al3Ti particles in the Al-Ti alloy refiner were efficiently fragmented by cold rolling. The size of the Al3Ti particles in cold rolled Al-Ti alloy refiner decreased from 280μm to 30μm with increasing reduction ratio of cold rolling. Mean size of α-Al grains in pure Al cast refined by the cold rolled Al-Ti alloy refiner decreased from about 500μm to 200μm with increasing the reduction ratio. In order to investigate mechanical property of the pure Al cast refined by the cold rolled Al-Ti alloy refiner, Vickers hardness test and tensile test were conducted. Strength of the pure Al cast refined by the cold rolled Al-Ti alloy refiner increased with increasing the reduction ratio. The strength improvement of pure Al cast refined by the cold rolled Al-Ti alloy refiner followed Hall-Petch relationship. From obtained results, it was concluded that cold rolling for refiner is useful practical application for pure Al cast.

Effect of Ball Milling and Crystallizing on Magnetic Properties of Nanocomposite Nd2Fe14B/α-Fe Permanent Magnetic Material

2015 ◽  
Vol 778 ◽  
pp. 79-82
Author(s):  
Yong Ping Jin ◽  
Bin Guo
Keyword(s):  
Magnetic Material ◽  
Grain Size ◽  
Magnetic Properties ◽  
Ball Milling ◽  
Milling Time ◽  
Magnetic Energy ◽  
Cast Alloy ◽  
X Ray Diffraction ◽  
Energy Product ◽  
Transmission Electron

Nanocomposite Nd2Fe14B/α-Fe magnetic material had been prepared by ball milling Nd8Fe86B6 as-cast alloy in Argon and subsequent crystallizing. Influence of ball milling on their magnetic properties had been investigated by means of X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM) etc. The results show that Nd2Fe14B grain are refined quickly and grain size of α-Fe decreases while extending milling time. After milling for 25h, grain size of α-Fe reaches about 7nm. Magnetic properties increase with milling time. Milled for 25h and crystallizing at 700°C for 30 minutes, samples have the best comprehensive magnetic properties (remanence, coercivity and magnetic energy product). To obtain nanocomposite permanent materials with high magnetic properties, it is necessary to combine ball milling with crystallizing.

Sign in / Sign up

Export Citation Format

Share Document