Damping properties on age hardening of Al–7Si–0.3Mg alloy during T6 treatment

Lee, Choong Do

doi:10.1016/j.msea.2004.11.033

Cited by 16 publications

(3 citation statements)

References 12 publications

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“…Besides, the distance between pinning points influences also the dislocation mobility. The latter is also related to the number and source of pinning point, temperature, and diffusivity of pinning point as was stated by Lee [23]. Therefore, the experimental results shown in Fig.…”

Section: Fractographymentioning

confidence: 56%

Fatigue Life Estimation of 6061 Aluminium Alloy Based on Modal Damping Measurements

Asseala¹,

Gomaa²

2005

ERJ. Engineering Research Journal

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The damping property of 6061 aluminium alloys, fabricated by hot isostatic pressing (HIP), has been studied for different ratios of fatigue on the base of modal damping analysis. The effects of age hardening on hardness, fatigue strength and damping loss factor of the material are discussed. On the other hand, the interrelations of fatigue life ratios and the damping loss factor are examined using modal analysis of free-free standard fatigue specimens within a wide range of resonance frequencies (2000 Hz-25 kHz). Methodologies used to generate data and extract the characteristics of damping phenomenon have been illustrated. Numerical analysis of values of damping loss factor has been evaluated and compared with experimental measurements. A rotating bending fatigue test is performed to correlate the modal damping to fatigue damage. The results show that, age hardening process increases the fatigue strength by 15% and the damping loss factor by 160 %. The underlying mechanisms are analyzed and discussed. The results seem to be a useful guide that may help in estimating the lifetime or at least the remaining life of a member loaded under fatigue through measuring damping loss factor. &LJj,yl &I + + 4;ii-ilJ 7. 7 \ ?+&I &&dl A &. ? ! +k L i j~ + I \.4h JJ&-1 JJUJ.(modal damping analysis)+&dl &+?I1

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Section: Fractographymentioning

confidence: 56%

Fatigue Life Estimation of 6061 Aluminium Alloy Based on Modal Damping Measurements

Asseala¹,

Gomaa²

2005

ERJ. Engineering Research Journal

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“…According to Zhou et al [14], the improvement of damping was linked with dislocation movements induced by the thermal stresses due to the coefficient of thermal expansion mismatch between the Al matrix and Si particles in Al-11.8Si alloy. Meanwhile Lee [16] reported that the maximum specific damping capacity coincided with the maximum age hardening condition but simultaneously decreased with overaging in Al-7Si-0.3Mg alloy with T6 treatment. This paper presents the results of an investigation of the effects of melt superheat treatment on the microstructure and dynamic mechanical properties of A357 alloys.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 91%

Comparison of dynamic mechanical properties of non-superheated and superheated A357 alloys

Mazlee¹,

Shamsul²,

Kamarudin³

2021

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The influence of superheat treatment on the microstructure and dynamic mechanical properties of A357 alloys has been investigated. The study of microstructure was performed by optical microscope. Dynamic mechanical properties (storage modulus, loss modulus and damping capacity) were measured by the dynamic mechanical analyzer (DMA). Microstructure showed coarser and angular eutectic Si particles with larger α-Al dendrites in non-superheated A357 alloy. In contrast, finer and rounded eutectic Si particles together with smaller and preferably oriented α-Al dendrites have been observed in superheated A357 alloy. Dynamic mechanical properties showed an increasing trend of loss modulus and damping capacity, meanwhile a decreasing trend of storage modulus at elevated temperatures for superheated and non--superheated A357 alloys. The significant improvement of damping capacities has been observed at lower temperatures range (50 to 277 • C) and higher temperatures range (278 to 380 • C) in non-superheated A357 alloy and superheated A357 alloy, respectively. The high damping capacity of superheated A357 alloy has been ascribed to the grain boundary damping at elevated temperatures.

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“…The increase of the damping capacity of the aluminium also can be achieved by the application of precipitation hardening treatment [10,11] and superheating treatment [12]. Choong Do Lee reported that the precipitation hardening of coherent Mg 2 Si on T6 treatment in Al-7Si-0.3Mg alloy play a fundamental role in the simultaneous enhancement of mechanical property and damping capacity [10].…”

Section: Introductionmentioning

confidence: 99%

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

Mazlee

Jamaludin

Yasmin

et al. 2015

MSF

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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.

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Damping properties on age hardening of Al–7Si–0.3Mg alloy during T6 treatment

Cited by 16 publications

References 12 publications

Fatigue Life Estimation of 6061 Aluminium Alloy Based on Modal Damping Measurements

Fatigue Life Estimation of 6061 Aluminium Alloy Based on Modal Damping Measurements

Comparison of dynamic mechanical properties of non-superheated and superheated A357 alloys

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

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