Precipitation and Softening Behaviour of Cast, Cold Rolled and Hot Rolling Prior to Cold Rolled Al-6mg Alloy Annealed at High Temperature

Kaiser, M. S.

doi:10.3329/jme.v45i1.24381

Cited by 4 publications

(4 citation statements)

References 3 publications

(1 reference statement)

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“…Alloys containing more than 3 wt.% Mg undergo sensitization, wherein the magnesium segregates from the solid solution, and this leads to a higher tendency for intercrystalline failure, presumably due to the formation of β-phase Al 8 Mg 5 or Al 3 Mg 2 precipitates at the slip band and grain boundaries. Upon cold working, this particular problem is aggravated [29,30]. As a result, fracture surfaces remain in the grain boundary.…”

Section: Sem and Edx Observationmentioning

confidence: 99%

"Precipitation behavior prior to hot roll in the cold-rolled Al-Mg and Al-Mg-Zr alloys "

Kaiser¹,

Rashed²

2022

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Precipitation behavior of directly cold-rolled and prior to hot roll Al-5Mg alloy with ternary zirconium has been examined. Hot-rolled and cold-rolled alloy samples are aged simultaneously isochronally and isothermally for different temperatures and times. Hardness, resistivity, impedance value, and DSC study have been considered to comprehend the precipitation behavior of the differently aged alloys. No age-hardening response is observed for all the alloys, but the directly cold-rolled Zr-added alloy resists the soften behavior than that of prior to hot roll alloy. Precipitation kinetics of Al3Zr in Al-5Mg-0.3Zr alloys is controlled by the diffusion of zirconium in aluminum. Microstructures display that the Al-5Mg alloy becomes almost fully recrystallized after aging at 300 • C for 300 min. But Zr-added alloys do not show this scenario owing to the presence of metastable fine L12 Al3Zr precipitates, which are thermally stable at high aging temperatures.

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Section: Sem and Edx Observationmentioning

confidence: 99%

"Precipitation behavior prior to hot roll in the cold-rolled Al-Mg and Al-Mg-Zr alloys "

Kaiser¹,

Rashed²

2022

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“…By adding scandium to aluminium alloys, there would be three principle effects that can be obtained. First, grain refinement during casting or welding, second precipitation hardening from Al 3 Sc particles and lastly, grain structure control from Al 3 Sc dispersoids [4]. The age hardening effect shown by the alloys are purely due to addition of scandium.…”

Section: Introductionmentioning

confidence: 98%

The Effect of Scandium on the Mechanical Properties of A356 Aluminium Alloy

Lim

Yeo

Masita

2016

KEM

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In this project, the addition of scandium (Sc) into A356 aluminium alloy was studied for its effect on the mechanical properties after gravity die casting process. Scandium addition was administered at the weight percentages of 0.1, 0.2 and 0.3. The results obtained in this work revealed that scandium can significantly enhance the mechanical properties of A356 alloy in terms of tensile strength, hardness and charpy impact strength. In general, the addition of 0.2 wt% Sc in A356 alloy was found to be able to achieve the maximum tensile strength of 172.94MPa as compared to 136.03MPa for sample without Sc. No significant improvement in tensile strength was found when more than 0.3wt% added to the alloy. As for hardness, the sample with 0.3 wt% Sc attained the maximum Vicker’s hardness of 86.60 HV as compared to 76.48 HV for unmodified A356. Similarly, the addition of 0.3wt% Sc in A356 can achieve highest impact energy of 2.71J as compare to 1.09J for unmodified A356.

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“…Plastic deformation is performed by rolling, dies or similar operations where the area is reduced. The level of area reduction controls the material ultimate properties [7].…”

Section: Introductionmentioning

confidence: 99%

On the mechanical behaviour of thermally affected non-heat-treatable aluminium alloys

Rokon,

Salman Haque,

Salim Kaiser

2023

JCTM

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The influence of heat treatment on the mechanical behavior in terms of true stress-strain and mode of fracture of the deferent non-heat-treatable alloys has been carried out. Hardness, resistivity and the microstructural change of the alloys due to annealing also consider for complying the properties. In this purpose the hot rolled followed by cold rolled alloys samples are isochronally annealed for one hour at different temperatures. The experimental results show that maximum strength can be achieved by 5xxx series alloys followed by 3xxx, 4xxx and the lowest for 1xxx series alloys as attributed to the alloying element performance. Increasing of heat treatment temperature led to decrease in hardness and resistivity of the alloys by reason of recovery and coarsened the grains. The stress-strain curves show the lower strength and higher elongation with annealing temperature. Microstructural study also confirms that cold rolled alloys contents the elongated grain but annealing at 400°C per one hour a recrystallized grains are formed. Fractographic observations also verify that commercially pure aluminum and silicon added alloys are fractured of ductile mechanism, but manganese and magnesium added alloys demonstrate a brittle type of fracture as by reason of formed intermetallic phases.

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Precipitation and Softening Behaviour of Cast, Cold Rolled and Hot Rolling Prior to Cold Rolled Al-6mg Alloy Annealed at High Temperature

Cited by 4 publications

References 3 publications

"Precipitation behavior prior to hot roll in the cold-rolled Al-Mg and Al-Mg-Zr alloys "

"Precipitation behavior prior to hot roll in the cold-rolled Al-Mg and Al-Mg-Zr alloys "

The Effect of Scandium on the Mechanical Properties of A356 Aluminium Alloy

On the mechanical behaviour of thermally affected non-heat-treatable aluminium alloys

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