Influence of Sr on mechanical properties of Al-2%Si alloys during eutectic solidification

Journal of Japan Institute of Light Metals Pub Date : 2023-09-15 DOI:10.2464/jilm.73.447a

Rio Hirano, Shogo Ozaki, Yoshihiro Nagata, Akira Matsushita, Toshio Sakamoto, Kanta Orio, Yasuhiko Okimura, Toshimitsu Okane, Muhammad Khairi Faiz, Makoto Yoshida

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Abstract

Al-Si alloys have lower hot tearing susceptibility (HTS) than other aluminum alloys. However, hot tearing occurs under certain casting conditions. It is known that the Sr addition reduces the HTS because of the enhancement of crack-healing. Meanwhile, an influence of Sr addition on the tensile strength, ductility, and viscous properties during eutectic solidification has not yet been clarified. In this study, we investigated the influence of Sr addition on these properties during eutectic solidification. The tensile tests during eutectic solidification were conducted for Al-2Si and Al-2Si-Sr alloys. The results show that the Sr addition did not affect the viscous properties. On the other hand, the tensile strength and elongation during the latter half of eutectic solidification increased by Sr addition. Consequently, the HTS reduction by Sr addition should be attributed to the improvement of ductility. It was suggested that the increase in the elongation by Sr addition should result from the decrease in the tensile stress, which affects the opening and propagation of hot tearing, due to the increase in porosity near the crack.

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Sr对Al-2%Si合金共晶凝固力学性能的影响

Al-Si合金具有较低的热撕裂敏感性(HTS)。然而，在某些铸造条件下，会发生热撕裂。已知锶的加入是由于增强了裂纹的愈合，从而降低了HTS。同时，在共晶凝固过程中，添加Sr对拉伸强度、塑性和粘滞性能的影响尚未明确。在本研究中，我们研究了在共晶凝固过程中添加锶对这些性能的影响。对Al-2Si和Al-2Si- sr合金进行了共晶凝固拉伸试验。结果表明，Sr的加入对黏性没有影响。Sr的加入提高了共晶凝固后期的抗拉强度和伸长率。因此，添加锶对高温高温的降低应归因于延性的改善。结果表明，Sr的加入增加了裂纹附近孔隙率，降低了拉伸应力，影响了热撕裂的开启和扩展，从而提高了伸长率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Japan Institute of Light Metals

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