技術報告
Sr改良したAl-8%Si-0.4%Cu-0.4%Mg合金溶湯の熱分析技術
2017 年 89 巻 10 号 p. 638-644
詳細
2017 年 89 巻 10 号 p. 638-644
Al-Si alloys are excellent in castability. However, the crystalized eutectic Si phase of this alloy is coarse and brittle. Therefore, modification treatment such as addition of Sr is carried out to enhance toughness. In this report, a thermal analysis technique to measure the degree of undercooling is introduced as a method to analyze the pre-casting process in order to confirm the effects of modification treatment. In the case of Al-8%Si-0.4%Cu-0.4%Mg alloy, which is one of the analyzed materials, it is determined to have been modified if the eutectic temperature shown by thermal analysis is 566℃ or less, and not modified if 568℃ or higher. In addition, if the temperature ranges between 566 and 568℃, Sr is added within an amount which will not cause over-modification of the structure, after having confirmed the values of P and Sr by spectro emission analysis.
