Influence of Ti to the Microstructure and Mechanical Properties of Al-12Si-3.2Cu-1Mg-2.4Ni Piston Alloy

Abstract:

Al-12Si-3.2Cu-1Mg-2.4Ni-χTi (χ=0, 0.2) alloys were prepared by squeeze casting process, and then heat-treated. The mechanical properties were tested at 350°C, the microstructure and phases in them were investigated by optical microscope, SEM, EDS and XRD. It is found that the grain size has an obvious increment after 0.2 wt. % Ti additions to Al-12Si-3.2Cu-1Mg-2.4Ni, and the ultimate tensile strength at elevated-temperature increased accordingly. Intermetallic compounds, such as γ-Al₇Cu₄Ni, M-Mg₂Si, Q-Al₅Cu₂Mg₈Si₆ and δ-Al₃CuNi existing in alloys with and without Ti addition. Needle-like Ti containing phase with the elements of Al, Si and Ti created in Al-12Si-3.2Cu-1Mg-2.4Ni-0.2Ti alloy, and the eutectic Si is found to distribute by the side of Ti containing phase.

• Periodical: Applied Mechanics and Materials (Volumes 477-478)
• Pages: 1278-1283
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.477-478.1278
• Online since: December 2013
• Authors: Ling Zhan Zhou*, Yin Jiang Peng, Xiu Rong Zhu, Guang Ming Zhang, Li Ming Yang, Hong Xia Shi
• Keywords: Intermetallic Compound, Microstructure, Phase, Piston Alloy, Ti, Ultimate Tensile Strength (UTS)

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