scholarly journals The Effects of Cold Rolling Process and Annealing Treatment on Damping Properties of 3105 Aluminium Alloy

2017 ◽  
Author(s):  
MUHAMMAD SYAFIQ BIN ZAKARIA
Keyword(s):  
Cold Rolling ◽  
Aluminium Alloy ◽  
Strain Hardening ◽  
Loss Modulus ◽  
Annealing Treatment ◽  
Hardness Measurement ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Damping Capacity ◽  
Damping Properties

The aluminium alloy have deformed by cold rolling process to 50 percent, 60 percent, and 70 percent rolling reduction. In order to reduce the strain hardening of the samples, an annealing treatment was performed after cold worked process. The lower the rolling reduction, the higher the damping capacity of the samples. The sample for 50 percent rolling reduction before annealed has increase in damping capacity from 0.0361 to 0.1318. When the samples undergo two different annealing temperatures and soaking hours, the damping properties such as loss modulus, storage modulus, and damping capacity show some changes in trend curves and experimental value. The damping capacity for sample 50 percent rolling reduction and after annealed at temperature 300 °C for one hour was increased from 0.0193 to 0.1405 at temperature 50 °C to 380 °C. The hardness measurement showed that, the value of Vickers hardness were decrease after annealed due to the decreasing in strain hardening.

scholarly journals The Effects of Rolling Deformation and Annealing Treatment on Damping Capacity of 1200 Aluminium Alloy

2015 ◽  
Vol 819 ◽  
pp. 20-24
Author(s):  
Mohd Noor Mazlee ◽  
Shamsul Baharin Jamaludin ◽  
Y. Yasmin ◽  
Shaiful Rizam Shamsudin ◽  
M.S. Risby ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Aluminium Alloy ◽  
Microstructural Evolution ◽  
Rolling Direction ◽  
Annealing Treatment ◽  
Rolling Reduction ◽  
Damping Capacity ◽  
Percent Reduction ◽  
Rolling Deformation

Annealing treatment is an important step of rolling deformation that contributes to microstructural evolution and leads to the significant changes in damping capacity. Damping capacities were analyzed in the parallel to rolling direction at 1 and 10 Hz respectively. It was found that severe plastic deformation at 40 percent reduction has lower damping capacity compared to that of 30 percent and 20 percent reductions respectively. The microstructural results show that the grains of as rolled alloys were changed to almost equiaxed structures after a rolling reduction at 40 percent reduction.

scholarly journals Twinning Behavior in Cold-Rolling Ultra-Thin Grain-Oriented Silicon Steel

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 187
Author(s):  
Bo Zhang ◽  
Li Meng ◽  
Guang Ma ◽  
Ning Zhang ◽  
Guobao Li ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Rolling Process ◽  
Silicon Steel ◽  
Mechanical Work ◽  
Area Fraction ◽  
Raw Material ◽  
Rolling Reduction ◽  
Cold Rolling Reduction ◽  
Schmid Factor ◽  
Twinning System

Twinning behaviors in grains during cold rolling have been systematically studied in preparing ultra-thin grain-oriented silicon steel (UTGO) using a commercial glassless grain-oriented silicon steel as raw material. It is found that the twinning system with the maximum Schmid factor and shear mechanical work would be activated. The area fraction of twins increased with the cold rolling reduction. The orientations of twins mainly appeared to be α-fiber (<110>//RD), most of which were {001}<110> orientation. Analysis via combining deformation orientation simulation and twinning orientation calculation suggested that {001}<110> oriented twinning occurred at 40–50% rolling reduction. The simulation also confirmed more {100} <011> oriented twins would be produced in the cold rolling process and their orientation also showed less deviation from ideal {001}<110> orientation when a raw material with a higher content of exact Goss oriented grains was used.

A Study on the Deformation Dehaviours of Al-1.4Fe-0.2Mn Alloy Sheets

2016 ◽  
Vol 877 ◽  
pp. 380-386 ◽  
Author(s):  
Yan Feng Pan ◽  
Pi Zhi Zhao ◽  
Yi Fu Shen ◽  
Xiang Jun Shi ◽  
Tao Jiang
Keyword(s):  
Dislocation Density ◽  
Cold Rolling ◽  
Work Hardening ◽  
Energy Dispersive Spectrometer ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Pure Aluminium ◽  
Work Softening ◽  
Grain Structures ◽  
Cold Rolling Reduction

The deformation behaviours and microstructure transformations during the cold rolling process of Al-1.4Fe-0.2Mn alloy sheets prepared from 99.7% pure aluminium were investigated by means of hardness-testing, transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS). The phenomena of work hardening and work softening were observed. The hardness of Al-1.4Fe-0.2Mn alloy sheets increased with the increasing of cold rolling reduction firstly, and reached to a peak at 80% cold rolling reduction, meaning work hardening. However, with further increasing of cold rolling reduction, the hardness decreased, which indicates work softening. During the initial deformation stage, the dislocation density and the number of sub-grain structures increased gradually, and many dislocations formed tangles, resulting in work hardening. When the cold rolling reduction exceeded 80%, the dislocation density decreased and sub-grain structures polygonized, leading to work softening. The forming of Mn, Fe and Si bearing compounds is an important reason for the work softening due to lowering solid solution content.

Microstructure and Damping Capacity of Semi-Solid AM50 Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 292-295
Author(s):  
Joong Hwan Jun ◽  
Bong Koo Park ◽  
Jeong Min Kim ◽  
Ki Tae Kim ◽  
Woon Jae Jung
Keyword(s):  
Annealing Treatment ◽  
Damping Capacity ◽  
Damping Properties ◽  
Flexural Mode ◽  
X Ray ◽  
Hardness Tests ◽  
Die Cast ◽  
Dislocation Movement ◽  
Am50 Alloy ◽  
Semi Solid

Microstructures and damping properties of semi-solid AM50 (Mg-5%Al-0.3%Mn) alloy were investigated and compared with those of die-cast AM50 alloy, based on experimental results of X-ray diffractometry (XRD), optical microscopy (OM), hardness tests and damping tests in a flexural mode. The semi-solid AM50 specimens show higher damping capacity than die-cast one in as-fabricated state, and the higher the fraction of solid α-(Mg), the greater the damping capacity. The annealing at 200oC deteriorates the damping properties of the semi-solid and die-cast specimens. This would be due to the segregation of solute atoms on dislocation lines, which eventually leads to lower internal friction by the restriction of dislocation movement. The peak damping values of the AM50 specimens are obtained after annealing at 400oC. The disappearance of segregates acting as pinning points of dislocations is thought to be responsible for the improvement in damping capacity. This result implies that the presence of solid α-(Mg) phase and annealing treatment at high temperature are beneficial to damping property of AM50 alloy.

scholarly journals The Microstructure and Deformation Behavior of Al-Fe-Mn Alloys with Different Fe Contents during Cold Rolling

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 753 ◽  
Author(s):  
Yanfeng Pan ◽  
Yifu Shen ◽  
Pizhi Zhao
Keyword(s):  
Cold Rolling ◽  
Work Hardening ◽  
Deformation Behavior ◽  
Critical Level ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Work Softening ◽  
Fe Content ◽  
Cold Rolling Reduction ◽  
Deformation Behaviors

The microstructure transformations and deformation behavior of Al-Fe-Mn alloys with different Fe contents during their cold rolling process were investigated by means of hardness testing, conductivity testing, and transmission electron microscopy. It was observed that the hardness of the two alloys increased initially along with the levels of cold rolling reduction, then reduced when levels of cold rolling reduction increased further. Two kinds of deformation behaviors, work hardening and work softening, were observed during cold rolling for both Al-Fe-Mn alloys with different Fe contents. The critical level of cold rolling reduction that led to the change from work hardening to work softening was different in both alloys and the critical level of cold rolling reduction of the alloy with high Fe content was significantly lower than that of the alloy with low Fe content. During the work hardening process, the number of dislocations in the alloys increased continuously as the level of cold rolling reduction increased and they were accompanied by the formation of substructures. After the occurrence of work softening, the dislocation density in the alloys was significantly reduced. The sub-grain structures polygonized and ultimately transformed into equiaxed sub-grains.

Different Damping Dependences on Volume Fractions of Thermal and Deformation-Induced ε Martensites in an Fe-Mn Alloy

2006 ◽  
Vol 319 ◽  
pp. 79-84 ◽  
Author(s):  
Joong Hwan Jun ◽  
Young Kook Lee ◽  
Jeong Min Kim ◽  
Ki Tae Kim ◽  
Woon Jae Jung
Keyword(s):  
Cold Rolling ◽  
Electron Micrographs ◽  
Damping Capacity ◽  
Damping Properties ◽  
Number Density ◽  
Volume Fractions ◽  
Martensite Content ◽  
Transmission Electron ◽  
Ε Martensite ◽  
Peak Value

We reports the damping properties of an Fe-23%Mn alloy with various amounts of thermal or deformation-induced ε martensite. By controlling cooling temperatures and cold rolling degrees, the volume fractions of thermal and deformation-induced ε martensites are changed from 33 to 50% and from 33 to 75%, respectively. The damping capacity of the Fe-23%Mn alloy increases with an increase in thermal ε martensite content, whereas the damping capacity associated with deformation-induced ε martensite shows a peak value at 57% of ε martensite. Transmission electron micrographs on deformed samples reveal that the decay of damping over 57% of deformation-induced ε martensite is caused by an introduction of perfect dislocations, which play a role in suppressing the movement of damping sources. For the same amount of ε martensite, deformation-induced ε martensite exhibits higher level of damping capacity than thermal ε martensite. This may well be owing to relatively greater length of γ/ε interfaces in response to higher number density of ε martensite plates.

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