Refinement of primary Si in the bulk solidified Al-20 wt.%Si alloy assisting by high static magnetic field and phosphorus addition

Xu, Chen; Zhong, Yunbo; Zheng, Tianxiang; Shen, Zhe; Wang, Jiang; Fan, Lijun; Zhai, Ya; Peng, Minghu; Zhou, Bangfei; Ren, Weili; Lei, Zuosheng; Ren, Zhongming; He, Qiongyi

doi:10.1016/j.jallcom.2017.04.085

Cited by 33 publications

(19 citation statements)

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“…For each sample, the values of N A , D 2 , being arithmetical average ones of those parameters from N analysed micro areas of the microsection and then, for each stereological parameter, standard deviation (S) has been calculated, as well as the width of the confidence interval (δ) [10]. Since the number of the analysed micro images has always met the condition of N < 30, t-Student distribution has been adopted for the calculations; the tα ,n-1 value for ut has been taken from tables, for the adopted level of confidence, P= 0.95.…”

Section: Investigation Methodologymentioning

confidence: 99%

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AlSi21CuNi silumin modification with phosphor and strontium micro additions

Michalski

Romankiewicz

2017

E3S Web Conf.

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Abstract. The paper presents the results of investigation of the influence of AlFeP and AlSr modifiers on the structure of the hypereutectoid silumin, AlSi21CuNi. The silumin has been modified in two stages. The first stage was melt with the addition of phosphor in the quantity of 120ppm. The second stage was combined application of phosphor and strontium. The strontium addition amounted 150, 250 and 350 ppm. At each melt, the metal has been cast after 10, 30, and 60 minutes from the introduction of the modifiers. The effectiveness of the modification has been assessed basing on qualitative and quantitative analysis of the microstructure of castings. It has been determined that the applied addition of phosphor causes significant comminution of the primary silicon secretions. Maximum comminution of primary silicon has been obtained after the longest time of the modified alloy soaking. The most advantageous effects of combined modification have been obtained with the application of 120ppm addition of P and 350ppm addition of Sr after 60 minutes from the introduction of the modifiers to the metal bath.

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Section: Investigation Methodologymentioning

confidence: 99%

“…In recent years, investigations aiming at comminution of the structure of castings by the application of magnetic field or advanced casting techniques are also performed [9,10]. The use of those techniques, however, is complicated and, therefore, limited.…”

Section: Introductionmentioning

confidence: 99%

AlSi21CuNi silumin modification with phosphor and strontium micro additions

Michalski

Romankiewicz

2017

E3S Web Conf.

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“…With the development of high static magnetic field (HSMF) technique, many metal solidification experiments have been successfully carried out under a HSMF which is continuously adjustable in magnetic flux density. Plenty of interesting results such as magnetic orientation 8–10 , grain refinement 11,12 and thermoelectric magnetic flow 13–16 et al . were revealed under a HSMF ( B < 20 Tesla).…”

Section: Introductionmentioning

confidence: 99%

Solute trapping in Al-Cu alloys caused by a 29 Tesla super high static magnetic field

Zheng

Zhou

Zhong

et al. 2019

Sci Rep

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Solidification of Al-Cu alloys has been investigated using a 29 Tesla super high static magnetic field (SHSMF). The results show that, by imposing a 29 Tesla SHSMF, the size of primary phases and spacing of eutectic structure have been refined through the increase of undercooling which results from the suppression of diffusion coefficient. The diffusion coefficient of atoms in the liquid matrix decreases to be about 1.2 × 10−12 m2/s. The lattice constants are reduced and high dislocation density forms in the primary phase, which induces a solute trapping effects. The spacing of (110) plane in Al2Cu is corrected to be 4.3123 Å and 4.2628 Å for Al-40 wt.%Cu alloys treated without and with a SHSMF. The spacing of (111) plane in Al is corrected to be 2.3351 Å and 2.3258 Å for Al-26 wt.%Cu alloys treated without and with a SHSMF. The compression yield strength has been improved by about 42% from 268 MPa to 462 MPa for Al-26 wt.%Cu and 42.5% from 248 MPa to 431 MPa for Al-40 wt.%Cu. The maximum elastic strain increases from about 2% to 4.3% for Al-26 wt.%Cu and from 2% to 4% for Al-40 wt.%Cu. It is expected that SHSMF is beneficial to process materials with high mechanical properties.

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“…The renement of primary Si in hypereutectic Al-Si alloys can be achieved by various methods, such as Al-P, Al-Fe-P and the Al-Ti-P-C master alloy, rare element and ultrasonic treatment, and electromagnetic stirring. [5][6][7][8][9][10][11][12][13][14] Although primary Si can be rened by traditional processes, many methods are either complex and cannot be used on a large scale, or they reduce the TC of the Al-Si alloy considerably.…”

Section: Introductionmentioning

confidence: 99%