Microstructure and Properties of Semisolid A356 Alloy Strip Affected by Nozzle Temperature of a Novel Micro Fused-Casting

Abstract

The semisolid A356 alloy strip was prepared by a novel continuous micro fused-casting process. The microstructure evolution and mechanical property of A356 aluminum alloy strip with different nozzle temperatures were investigated. The nozzle temperature had great influences on the microstructure and property primarily accompanied with the crystal change in the fused-casting area through the cooling conditions. The results showed that the semisolid A356 alloy strip samples fabricated by micro fused-casting demonstrated good performances and uniform structures with the nozzle temperature at 593 °C and the stirring velocity at 700 r/min. The fine grains of the primary α-Al phase with average grain size of 51 µm and shape factor up to 0.71 were obtained under the micro fused-casting process, and the ultimate average vickers hardness came up to 83.39±0.89 HV, and the tensile strength and elongation of the A356 alloy strip reached 245.32 MPa and 7.85%, respectively.

Keywords

semisolid / A356 aluminum alloy / nozzle temperature / micro fused-casting

References

[1] Sercombe T B, Schaffer G B. Rapid Manufacturing of Aluminum Components. Science, 2003, 301(5637): 1 225-1 227.

[2] Zhao Z, Mao W, Li S, et al. Preparation of Semisolid AlSi7Mg Alloy Slurry Through Weak Traveling-wave Electromagnetic Stirring. International Journal of Minerals, Metallurgy and Materials, 2009, 16(5): 554-558.

[3] Guan R, Zhao Z, Lian C, et al. Mathematic Model of Rolling Pressure During a Semisolid Shearing-rolling Process. International Journal of Minerals, Metallurgy and Materials, 2012, 19(12): 1 121-1 127.

[4] Liu Z, Mao W, Zhao Z. Effect of Pouring Temperature on Semi-solid Slurry of A356 Al Alloy Prepared by Weak Electromagnetic Stirring. Transactions of Nonferrous Metals Society of China, 2006, 16(1): 71-76.

[5] Mazzolani F M. 3D Aluminium Structures. Thin-Walled Structures, 2012, 61: 258-266.

[6] Liu Z, Mao W, Zhao Z. Research on Semi-solid Slurry of A Hypoeu-Tectic Al-Si Alloy Prepared by Low Superheat Pouring and Weak Electromagnetic Stirring. Rare Metals, 2006, 25(2): 177-183.

[7] Luo X, Han Y, Li Q, et al. Microstructure and Properties of ZL101 Alloy Affected by Substrate Movement Speed of a Novel Semisolid Continuous Micro Fused-Casting for Metal Process[J]. Journal of Wuhan University of Technology, 2018(03): 715–719

[8] Luo X, Han Y, Li Q, et al. Effect of Pouring Temperature on Microstructure and Properties of A356 Alloy Strip by a Novel Semisolid Micro Fused-Casting for Metal[J]. Journal of Wuhan University of Technology, 2019(05): 1 205–1 209

[9] Liu Z, Mao W, Zhao Z. Effect of Pouring Temperature on Semi-solid Slurry of A356 Al Alloy Prepared by Weak Electromagnetic Stirring. Transactions of Nonferrous Metals Society of China, 2006, 16(1): 71-76.

[10] Guan R G, Zhao Z, Lian C, et al. Microstructure Formation Mechanism and Properties of a Mg-3Sn-1Mn (wt%) Magnesium Alloy Processed by A Novel Semisolid Continuous Shearing and Rolling Process. Metals and Materials International, 2013, 19(1): 33-38.

[11] Qi M, Kang Y, Zhou B, et al. A Forced Convection Stirring Process for Rheo-HPDC Aluminum and Magnesium Alloys. Journal of Materials Processing Technology, 2016, 234: 353-367.

[12] Wang S, Cao F, Guan R, et al. Formation and Evolution of Non-dendritic Microstructures of Semi-solid Alloys Prepared by Shearing/Cooling Roll Process. Journal of Materials Science and Technology, 2006, 22(2): 195-199.

[13] Flemings M. Behavior of Metal Alloys in the Semisolid State. Metallurgical Transactions B, 1991, 22(3): 269-293.

[14] Wang X, Yan Y, Pan Y, et al. Generation of Three-dimensional Hepatocyte/Gelatin Structures with Rapid Prototyping System. Tissue Engineering, 2006, 12(1): 83-90.

[15] Guan R, Zhao Z, Zhang H, et al. Microstructure and Properties of Mg-3Sn-1Mn (wt%) Alloy Processed by A Novel Continuous Shearing and Rolling and Heat Treatment. Materials Science and Engineering: A, 2013, 559: 194-200.

[16] Nafisi S, Ghomashchi R. Grain Refining of Conventional and Semi-solid A356 Al-Si Alloy. Journal of Materials Processing Technology, 2006, 174(1–3): 371-383.

[17] Khosravi H, Eslami-farsani R, Askari-paykani M. Modeling and Optimization of Cooling Slope Process Parameters for Semi-solid Casting of A356 Al Alloy. Transactions of Nonferrous Metals Society of China, 2014, 24(4): 961-968.

[18] Luo X, Li Z, Si X, et al. Effect of Stirring Velocity in Micro Fused-Casting for Metal on Microstructure and Mechanical Properties of A356 Aluminum Alloy Slurry[J]. Journal of Wuhan University of Technology, 2016(05): 1 131–1 136

[19] Luo X, Yan Q, Li Z. Effect of the Pouring Temperature by Novel Synchronous Rolling-casting for Metal on Microstructure and Properties of ZLl04 Alloy. Journal of Materials Research, 2016, 31(16): 2 524-2 530.