Clarification of the mechanism of hot tearing susceptibility reduction by Sr addition in Al-Mg-Mn-based die casting alloy using acoustic emission method

被引：0

作者：

Tsuchiya A. ^{[1
]}

Nagata Y. ^{[2
]}

Kumaki T. ^{[1
]}

Faiz M.K. ^{[3
]}

Okimura Y. ^{[1
]}

Okane T. ^{[4
]}

Yoshida M. ^{[5
]}

机构：

[1] Modern Mechanical Engineering, School of Creative Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo

[2] Creative Science and Engineering, Waseda University, Shinjuku-ku, Tokyo

[3] Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur

[4] Department of Manufacturing Technologies, Faculty of Technologists, Institute of Technology, Gyoda-shi, Saitama

[5] Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Shinjuku-ku, Tokyo

来源：

Keikinzoku/Journal of Japan Institute of Light Metals | 2023年 / 73卷 / 07期

关键词：

acoustic emission; aluminum alloy; die casting; hot tearing; semi-solid;

D O I：

10.2464/jilm.73.315

中图分类号：

学科分类号：

摘要：

In our previous study, Al-4.5Mg-1.0Mn based alloy with addition of both Si, Sr, Ti, B and hydrogen over 0.5 ml/100 gAl was developed with around 15% of fracture elongation and low hot tearing susceptibility (HTS). It was suggested that the mechanism of HTS reduction by the addition of Sr should be attributed to the decrease in the tensile thermal load due to the formation of hydrogen gas porosity at a relatively low solid fraction under the solidification shrinkage is constrained. In this study, we verified the above hypothesis by using acoustic emission (AE) method. The effect of the hydrogen content and Sr addition on AE signals were examined in the constrained castings during solidification. As a result, it was found that AE peak volts which indicates the occurrence of shrinkage and/or gas porosity were reduced under the condition with 1.0 ml/100 gAl hydrogen and Sr. By the addition of hydrogen, AE signals from non-constrained castings during solidification indicated that the formation of hydrogen gas porosity reduced the AE peak volts. These results revealed that the addition of 1.0 ml/100 gAl hydrogen and Sr reduces the AE peak volts due to the promotion of hydrogen gas porosity. Therefore, the hypothesis should be reasonable. © 2023 The Japan Institute of Light Metals.

引用

页码：315 / 321

页数：6

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