Influence of Cr Contents on Microstructure of the Cast Al-3Si-0.4Mg Alloys [Cr含量对铸造Al-3Si-0.4Mg合金微观组织的影响]

作者：Dai H.; Zhao H.; Li C.; Zhu L.

来源：Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys, 2019, 39(12): 1371-1375.

DOI：10.15980/j.tzzz.2019.12.026

• Al-Si-Mg Alloy
• Cr
• Microstructure
• Phase Diagram

Phase diagrams and solidification processes of Al-3Si-0.4Mg alloys with different Cr contents were calculated by the Thermo-Calc phase diagram software, which were verified by gravity casting. The results reveal that the experimental results are in good agreement with those calculated by Scheil module in Thermo-Calc software. When the contents of Cr is less then 0.13%, the effect of Cr on the microstructure of the alloy can be ignored. When the contents of Cr is more than 0.2%, Al13 (Cr, Fe) 4Si4 phase can be observed. As the Cr content increased from 0.13% to 0.2%, the average length of the iron-rich phase in the alloy is decreased, and the volume fraction of the iron-rich phase in the alloy is increased.

• 单位
  华南理工大学