Modelling and prediction impression creep behaviour of Al–Cu cast alloy

Dehnavi, Mehdi; Vafaeenezhad, H.; Khakzadi, Mohsen; Nayebpashaee, Nasim; Eivani, A.R.

doi:10.1080/13640461.2016.1242191

Cited by 7 publications

(10 citation statements)

References 29 publications

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“…Further, increase in test temperature to 373 and 573 K decreased the creep resistance or increased the creep rate of FZ of all weldments as shown in Figure a and b and Figure a and b. It is evident from Table that the steady‐state creep rate was increasing exponentially with increase in temperature …”

Section: Resultsmentioning

confidence: 78%

“…It is apparently visible that after a short primary creep stage almost all the curves exhibited an extended secondary‐creep region where depth increased linearly with time. It is not possible to record the tertiary stage of the curve since the impression creep test is compressive in nature, necking and fracture of the specimen do not occur . The Figure a and b showing that at ambient temperature (303 K), no significant difference was observed in impression velocity and steady‐state creep rate and thus, showed the similar value of impression depth (approx.…”

Section: Resultsmentioning

confidence: 96%

“…In other words, the creep mechanism of metallic materials can be determined by finding the stress exponent ( n ) and activation energy ( Q ) by performing a series of creep measurements at different stresses or temperatures . The ‘ n ’ and ‘ Q ’ can be determined from the power law creep equation as follows:

ϵ ° = A σ_{c}^{n} \exp true(- \frac{Q}{R T} true)

where, ϵ ° is the minimum steady‐state creep rate, A is a material constant, σ c is the actual creep stress which is generally one‐third of applied punching stress ( σ i ), n is the stress exponent, Q is the creep activation energy, T is the temperature and R is the universal gas constant.…”

Section: Resultsmentioning

confidence: 99%

“…The creep resistance of weldments can be determined by obtaining thermal activation parameters, aiding the identification of the rate controlling mechanisms of creep. According to the literature, the creep resistance of any surface is directly related to its hardness. Generally, the hardness of AA5083 alloy weldment is on the lower side due to the loss of strain hardening effects during fusion welding.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pulse Duration on Corrosion and Impression Creep Properties of AA5083‐H111 Al–Mg Alloy Weldments Processed by P‐GTAW

Umar

Sathiya

2018

Adv Eng Mater

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In this work, the corrosion and impression creep properties of weldments are determined using potentiodynamic polarization test and impression creep test. It is evident that the shorter pulse duration results in comparatively finer grains and reduces the loss of magnesium in fusion zone, which facilitates an increase in precipitation of anodic β-phase (Al 3 Mg 2 ) and Mg 2 Si particles in the grain boundaries. It leads to the formation of pits by dissolving Mg atoms and propagate along the interdendritic region and finally corrode the surface thoroughly. On contrary, the increase in pulse duration results in uniform distribution of iron-rich Al 6 (Fe,Mn) intermetallics as well as Fe and Mn particles in the interdendritic region which induce localized cathodic reaction and these localized cathodes assisted in achieving noble corrosion resistance by increasing the width of passive region. Also, an increase in creep resistance is attained with an increase in activation energy at a temperature of 573 K owing to the uniform dispersion of iron-rich Al 6 (Fe, Mn) intermetallics in the grain boundaries of weldments processed with longer pulse duration. Hence, it is inferred from this research that the rise in pulse duration improves the corrosion and creep resistance of weldments by altering the morphology and surface distribution of intermetallics.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 96%

ϵ ° = A σ_{c}^{n} \exp true(- \frac{Q}{R T} true)

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Pulse Duration on Corrosion and Impression Creep Properties of AA5083‐H111 Al–Mg Alloy Weldments Processed by P‐GTAW

Umar

Sathiya

2018

Adv Eng Mater

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“…Al-Cu cast alloys exhibit great mechanical properties, such as high strength and hardness, low-cycle fatigue and creep resistance, and good machinability [13][14][15]. The most commonly used high strength cast aluminium alloys are based on the Al-Cu binary system (4.0-5.0 wt% Cu), such as A206 alloy, which is one of the strongest and toughest cast aluminium alloys [16,17].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

Wang

Jiang

et al. 2020

Mater. Res. Express

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Al-Cu, being a high-strength aluminium alloy, is used to prepared castings which are widely used in the automotive and aerospace industries as lightweight parts. However, corrosion is an issue. The Al-Cu alloys show improved properties when other elements are added to them. One such alloy is Al-4.5Cu-3.5Zn-0.5Mg. In order to improve the corrosion resistance and strength of this Al-4.5Cu-3.5Zn-0.5Mg cast alloy, a novel non-isothermal ageing (NIA) treatment was developed that comprised a heating stage up to 250°C, followed by a cooling stage down to room temperature at the rate of 60°C·h −1 . Specimens were removed throughout the process and immediately quenched for morphological, mechanical, and electrochemical testing. The hardness continuously increased up to 124 HV with ageing time. The alloy exhibited optimal properties after ageing for~340 min (with the aging temperature reaching 130°C during the cooling stage of the NIA treatment), with a tensile strength and maximum corrosion depth of 395 MPa and 165 μm, respectively. Fine precipitates discontinuously appeared at the grain boundaries during the cooling stage. Some new fine Ω phases were precipitated in the grains, thereby narrowing the precipitation-free zone. Thus, high strength and good corrosion resistance of the alloy can be obtained via the NIA treatment. Notably, NIA treatments are less time-consuming than isothermal ageing treatments, thereby expanding the applications of high-strength cast aluminium alloys in the manufacturing industry.

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Design and Fabrication of Impression Creep Testing Setup and Experimental Validation with 2219Al Alloys

Gogoi

Boruah

Ahmed

et al. 2022

Lecture Notes in Mechanical Engineering

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Modelling and prediction impression creep behaviour of Al–Cu cast alloy

Cited by 7 publications

References 29 publications

Effect of Pulse Duration on Corrosion and Impression Creep Properties of AA5083‐H111 Al–Mg Alloy Weldments Processed by P‐GTAW

Effect of Pulse Duration on Corrosion and Impression Creep Properties of AA5083‐H111 Al–Mg Alloy Weldments Processed by P‐GTAW

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

Design and Fabrication of Impression Creep Testing Setup and Experimental Validation with 2219Al Alloys

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