Affiliation:
1. State Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract
In this paper, the effects of Ni content on the room and elevated temperature (250 °C) tensile strength of Al-7Si-1.5Cu-0.4Mg-0.3Mn-0.1RE-xNi (x = 0, 0.3, 0.6, 0.9 wt.%) alloys were investigated, along with microstructure characterization and tensile testing. In the as-cast state, the dominant Ni-rich phases were primarily the γ-Al7Cu4Ni and δ-Al3CuNi phases. Following the solution heat treatment, a significant reduction in the γ-Al7Cu4Ni phase was noted, accompanied by the emergence of numerous small ε-Al3Ni phases. Both room temperature strength and high temperature strength at 250 °C exhibited a consistent increase with rising Ni content, reaching 405 MPa and 261 MPa, respectively, at 0.9 Ni content, which were increased by 6.4% and 16.8%, respectively, compared with 0 Ni content. The elongation exhibited an oscillating increase within the Ni content range of 0 to 0.6, reaching peak values of 2.6% in room temperature and 4.3% in high temperature at 0.6 Ni, followed by a rapid decline. At 0.6 Ni content, the alloy demonstrated a well-balanced combination of mechanical properties, featuring commendable strength and plasticity.
Funder
National Natural Science Foundation of China
Reference46 articles.
1. Qin, Y., Yan, Z., Wu, Q., Jiang, A., Li, Y., Ma, S., Lü, S., and Li, J. (2023). Development of a novel high strength Al-Si-Cu-Ni alloy by combining micro-alloying and squeeze casting. J. Alloys Compd., 967.
2. Progress and Prospect of Cast Heat-resistant Aluminum Alloy;Zhang;Mater. Rev.,2022
3. Effect of Minor Addition of Ni and Zr on the High-Temperature Performance of Al-Si-Cu-Mg Cast Alloys;Zedan;Int. J. Met.,2022
4. Cho, Y.-H., Im, Y.-R., Kwon, S.-W., and Lee, H.-C. (2003, January 7–11). The Effect of Alloying Elements on the Microstructure and Mechanical Properties of AI-12Si Cast Alloys. Proceedings of the Thermec’2003 pt.1, Madrid, Spain.
5. Microstructure and mechanical properties of unidirectionally solidified Al-Si-Ni ternary eutectic;Rohatgi;Met. Trans. A,1975