Solidification Studies of 3003 Aluminium Alloys with Cu and Zr Additions

Jaradeh, Majed; Carlberg, Torbjörn

doi:10.1016/s1005-0302(11)60116-3

Cited by 31 publications

(14 citation statements)

References 13 publications

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“…Cracking in this alloy, D1, seems to occur randomly but with a high frequency, which suggests that various parameters are involved in the crack formation. An analysis of the crack region in large ingots revealed a large fraction Al 2 Cu phase, [28] showing a strongly nonequilibrium amount of eutectic. Another interesting observation in this context is Figure 13, where large zones with macro-segregation occur at stress concentration points.…”

Section: B Effect Of Cu Additionmentioning

confidence: 99%

“…Figures 7 and 8 from the three-dimensional structure of Al 6 (Mn,Fe), and the hot tearing region, respectively, show that aluminum grains are bonded by Al 6 (Mn, Fe) phases. In DTA analysis and Bridgman solidification of similar alloys, [28,29] it was shown that Al 6 (Mn, Fe) phases formed early and in parallel with Al dendrites, which may reinforce the microstructure by bridging the gaps between primary dendrites. This will strengthen the alloy against hot tearing formation during liquid-solid contraction in the same way as has been proposed for the b phase in 6xxx [3] and foundry alloys.…”

Section: A Effect Of Fe Additionmentioning

confidence: 99%

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Hot Tearing Susceptibility of AA3000 Aluminum Alloy Containing Cu, Ti, and Zr

Razaz

Carlberg

2019

Metall Mater Trans A

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Severe hot tearing has been observed during DC casting of modified AA3000 alloys with additions of Cu, Ti, and Zr, although these alloys are regarded as rather easy to cast. Extensive studies have been performed on both synthetic and industrial AA2000, AA6000, and AA7000 alloys, but less data are available for AA3000 alloys. This work was thus initiated to investigate the hot tearing susceptibility of AA3000 alloys with varying alloy element content using constrained rod casting molds. The results showed that the Cu and Fe content have a major impact on hot tearing resistance, while the effects of Zr and Ti are minor. Cu in a range from 0.3 to 1.2 wt pct significantly increased the hot tearing tendency. This is due to the existence of high eutectic fractions at low temperatures, as well as porosity formation associated with bad feeding at the end of solidification. A strong cracking tendency was observed below an Fe content 0.2 wt pct owing to decreased precipitation of the Al 6 (Mn, Fe) phase. It was found that primary Al 6 (Mn, Fe) phases lead to early bridging between the grains, which reinforces the alloy during the vulnerable temperature range for hot tearing. Zr and Ti additions weakly enhanced or reduced hot tearing severity, respectively.

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Section: B Effect Of Cu Additionmentioning

confidence: 99%

Section: A Effect Of Fe Additionmentioning

confidence: 99%

Hot Tearing Susceptibility of AA3000 Aluminum Alloy Containing Cu, Ti, and Zr

Razaz

Carlberg

2019

Metall Mater Trans A

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“…The curve illustrates the derivative dT/dt, what enhances less visible changes present on the cooling curve T = f(t) 19 (method of the thermal-derivative analysis -ATD method). Except such methods, other methods based on thermal effects (DTA, ATDG method) [20][21][22] , thermo-electric effects (ATD-AED method) 23 , and thermo-voltage effects (ATND method) are also used [24][25][26][27][28][29] . The ATND (thermal-voltage-derivative analysis) method is the author's own method of analysis of the crystallization process.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Mechanical Properties of AlSi13Cu2Fe Alloy Using the ATND Methods

Pezda

2016

Mat. Res.

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The present paper describes an experimental testing method connected with use of the thermal-voltage-derivative analysis (the ATND method in short) to crystallization recording of the AlSi13Cu2Fe eutectic alloy in aspects of possible prediction of its mechanical properties, basing on dependencies obtained from regression analysis, performed on the basis of temperature and voltage values of characteristic points seen on curves from the ATND method. Results of the experiment have demonstrated a significant relation between values of the characteristic points from the ATND method and the mechanical properties (yield strength R 0,2 and hardness HB 10/1000/30). Moreover, obtained dependencies have enabled prediction of the yield strength R 0,2 and the hardness HB 10/1000/30 as early as at preparation stage (melting) of the investigated alloy, what allows quick correction of performed modification process.

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“…The promising results are related to the formation of a dense and homogeneous distribution of the L1 2 -structured Al 3 (Sc,Zr) precipitates. [2][3][4][5][6][7][9][10][11] The complex nanostructure of the Al 3 (Sc,Zr) phase in aluminum has been discussed in several recent articles by studies using conventional and high-resolution transmission electron microscopy (TEM). [12,13] Atom-probe tomography (APT) was also employed to measure Sc,Zr concentration and distribution.…”

Section: Introductionmentioning

confidence: 99%

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Vlach

Čı́žek

Melikhova

et al. 2015

Metall Mater Trans A

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Thermal effects on the precipitation stages in as-cast Al-0.70 at. pct Mn-0.15 at. pct Sc-0.05 at. pct Zr alloy were studied. The role of lattice defects was elucidated by positron annihilation spectroscopy (lifetime and coincidence Doppler broadening) enabling investigation of solutes clustering at the atomic scale. This technique has never been used in the Al-Sc-and/or Al-Zr-based alloys so far. Studies by positron annihilation were combined with resistometry, hardness measurements, and microstructure observations. Positrons trapped at defects are preferentially annihilated by Sc electrons. Lifetime of trapped positrons indicates that Sc atoms segregate at dislocations. Maximum fraction of positrons annihilated by Sc electrons occurring at 453 K (180°C) suggests that clustering of Sc bound with vacancies takes place. It is followed by peak of this fraction at 573 K (300°C). A rise of the contribution of trapped positrons annihilated by Zr electrons starting at 513 K (240°C) and attaining maximum also at 573 K (300°C) confirms that Zr participates in precipitation of the Al 3 Sc particles already at these temperatures. The pronounced hardening at 573 K (300°C) has its nature in the precipitation of the Al 3 Sc particles with a Zr-rich shell. The contribution of trapped positrons annihilated by Mn electrons was found to be negligible.

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Solidification Studies of 3003 Aluminium Alloys with Cu and Zr Additions

Cited by 31 publications

References 13 publications

Hot Tearing Susceptibility of AA3000 Aluminum Alloy Containing Cu, Ti, and Zr

Hot Tearing Susceptibility of AA3000 Aluminum Alloy Containing Cu, Ti, and Zr

Prediction of Mechanical Properties of AlSi13Cu2Fe Alloy Using the ATND Methods

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

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