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.

Effects of Cold-Rolling Reduction on Microstructure and Mechanical Properties of Ti50Zr30Nb10Ta10 Alloy

2016 ◽  
Vol 849 ◽  
pp. 376-381
Author(s):  
Ming Long Li ◽  
Yu Jie Geng ◽  
Chen Chen ◽  
Shu Jie Pang ◽  
Tao Zhang
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Plastic Strain ◽  
Cold Rolling ◽  
Reduction Ratio ◽  
High Fracture ◽  
Dendrite Structure ◽  
Microstructure And Mechanical Properties ◽  
Cold Rolling Reduction ◽  
Cold Rolled

The effects of cold-rolling with different reduction ratios of 70%-90% on the microstructure and mechanical properties of Ti50Zr30Nb10Ta10 alloy were investigated. It was found that the β-Ti phase in this alloy was stable under cold-rolling. With the increase in reduction ratio from 70% to 90%, the microstructure of the alloys evolved from deformed dendrite structure to fiber-like structure. The alloy cold-rolled with the reduction ratio of 70% exhibited optimum mechanical properties of combined high fracture strength of 1012 MPa and plastic strain of 10.1%, which are closely correlated with the dendrite structure of the alloy. It is indicated that the proper cold-rolling is an effective way to improve the mechanical properties of the titanium alloy.

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.

Microstructure and Properties of Cu-5.7%Cr In Situ Fibrous Composite Produced by Equal-Channel Angular Pressing and Cold Rolling

2010 ◽  
Vol 667-669 ◽  
pp. 541-546 ◽  
Author(s):  
Wei Wei ◽  
Fei Wang ◽  
Kun Xia Wei ◽  
Igor V. Alexandrov ◽  
Jing Hu
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Cold Rolling ◽  
Equal Channel Angular Pressing ◽  
Cast Alloy ◽  
Fibrous Composite ◽  
Angular Pressing ◽  
Average Grain Size ◽  
Before And After

The composite filament structure was produced in Cu-5.7%Cr as-cast alloy ingots, subjected to equal channel angular pressing (ECAP) and cold rolling (CR) at room temperature. Microstructure, tensile properties and electrical conductivity before and after the severe plastic deformation (SPD) processing have been investigated here. The results point out that the rotation and spreading of Cr particles took place during ECAP and the additional rolling resulting in long thin in situ filaments. The average grain size of a Cu phase is equal to about 200 nm after eight ECAP passes. The formation of finer equiaxed grains of the Cu phase has been revealed after the additional CR. The tensile strength 403 MPa and 507 MPa have been achieved after one and eight ECAP passes respectively and increased up to 517 MPa and 607 MPa after the subsequent CR deformation. The enhancement of the tensile strength and the deterioration of the electrical conductivity have been explained by the microstructure evolution of Cu matrix and the dendritic Cr phase.

scholarly journals Grain Refinement of As-Cast Pure Al by Cold-Rolled Al–Ti Alloy Refiner

2013 ◽  
Vol 54 (9) ◽  
pp. 1554-1561 ◽  
Author(s):  
Hisashi Sato ◽  
Kentaro Ota ◽  
Motoo Furukawa ◽  
Miki Azuma ◽  
Yoshimi Watanabe ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Ti Alloy ◽  
Cold Rolled

Ti-Based Bulk Metallic Glass with High Cold Workability at Room Temperature

2005 ◽  
Vol 475-479 ◽  
pp. 3431-3434 ◽  
Author(s):  
J.M. Park ◽  
J.S. Park ◽  
J.H. Kim ◽  
Myung Hyun Lee ◽  
Won Tae Kim ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Metallic Glass ◽  
Cold Rolling ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Shear Bands ◽  
Reduction Ratio ◽  
Large Plastic Strain ◽  
Cold Rolled ◽  
Cold Workability

The cold workability of Ti-based bulk metallic glasses (BMGs) have been investigated. Ti45Zr16Be20Cu10Ni9 BMG with a large compressive plastic strain of 4.7 % shows a high cold workability, i.e. total reduction ratio of 50 % by cold rolling at room temperature. The multiple shear bands formed during rolling are effective in enhancing the plasticity. The cold rolled Ti45Zr16Be20Cu10Ni9 BMG (reduction ratio: 30 %) exhibits a large plastic strain of ~14 %.

scholarly journals PRECIPITATION AND SOFTENING BEHAVIOUR OF CAST, COLD ROLLED AND HOT ROLLING PRIOR TO COLD ROLLED AL-6MG ALLOY ANNEALED AT HIGH TEMPERATURE

2015 ◽  
Vol 45 (1) ◽  
pp. 32-36
Author(s):  
M. S. Kaiser
Keyword(s):  
Electrical Conductivity ◽  
Cold Rolling ◽  
Hot Rolling ◽  
Cast Alloy ◽  
Softening Behaviour ◽  
Cold Rolling Reduction ◽  
Dislocation Movement ◽  
Higher Temperature ◽  
Cold Rolled ◽  
Cold Worked

The effect of cast, cold rolling and hot rolling prior to cold rolling reduction on the hardness, electrical conductivity and grain size of annealed Al-6Mg alloys was studied. It was found that the hot rolling prior to cold rolling attend the higher strength due to precipitation of b-phase  during hot rolling which hinder the dislocation movement. At higher temperature of annealing electrical resistivity decreses due to particle coarcening  but in case of cast alloy it increases due to precipitation of b-phase. It is seen from the microstructure that the cold worked structures are comprised of elongated grains. It is also observed that the cold rolled alloy attained almost fully re-crystallized state after annealing  at 400oC for 60 minutes.

Anomalous Characteristics of Ti-Nb-Ta-Zr Alloy for Biomedical Applications

2010 ◽  
Vol 638-642 ◽  
pp. 16-21 ◽  
Author(s):  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Toshikazu Akahori ◽  
Harumi Tsutsumi
Keyword(s):  
Thermal Expansion ◽  
Cold Rolling ◽  
Rolling Direction ◽  
Negative Thermal Expansion ◽  
Reduction Ratio ◽  
Expansion Rate ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior ◽  
Cold Rolled ◽  
Effect Of Oxygen

Negative thermal expansion, i.e. a type of shrinkage that occurs during heating, was observed in cold-rolled Ti-29Nb-13Ta-4.6Zr alloy (mass%) (TNTZ). The reduction ratio of cold rolling was systematically changed, and then the thermal expansion rate was measured using a dilatometer. The cyclicity of thermal expansion was also examined for the cold-rolled TNTZ. Further, the effect of oxygen content on the thermal expansion behavior of the cold rolled TNTZ was examined. With an increase in the reduction ratio of cold rolling, the thermal expansion rate of TNTZ cold-rolled parallel to the rolling direction (RD) decreases, but it increases in TNTZ cold-rolled parallel to the transverse direction (TD). The cyclicity of above-mentioned anomalous thermal expansion is observed in a temperature range below 473 K, but it is not observed when the specimen is heated to above 573 K in the first cycle. The oxygen suppresses the negative thermal expansion behavior of TNTZ.

Sign in / Sign up

Export Citation Format

Share Document