Microstructure evolution of 356 aluminum alloy with high Fe content during semi-solid isothermal treatment [高铁356铝合金半固态等温处理过程中的组织演变]

作者：Lin B.; Li H.-Y.; Xu R.; Zhang W.-W.; Xiao H.-Q.; Li S.-B.

来源：Transactions of Materials and Heat Treatment, 2018, 39(6): 55-61.

DOI：10.13289/j.issn.1009-6264.20180037

• 356 aluminum alloy
• Iron-rich intermetallic phase
• Semi-solid isothermal treatment

The microstructure evolution of 356 aluminum alloy with high iron content during semi-solid isothermal treatment was studied by means of microstructure observation, quantitative metallographic analysis, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. The results show that the optimal semi-solid isothermal treatment process for the 356 aluminum alloy with high Fe content is thermal insulation at 590 ℃ for 60 min. After that the α(Al) grain will turn rounded, and have the grain size of 89 μm, shape factor of 0.75 and the liquid phase fraction of 40%. The semi-solid isothermal treatment can change the Fe-rich β-Fe phase from the long needle-like to the fine short rod-like, mainly attributed to the dissolution and breakage of the iron-rich intermetallics at high temperature.

• 单位
  华南理工大学