Microstructure and mechanical properties of rare-earth-modified Al-1Fe binary alloys

作者：Shi, Z. M.^*; Gao, K.; Shi, Y. T.; Wang, Y.

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 632: 62-71.

DOI：10.1016/j.msea.2015.02.068

• Mechanical characterization
• Microanalysis
• X-ray diffraction
• Aluminum alloys
• Casting
• Grain refinement

Rare-earth (RE) mischmetal modification, homogenous annealing and rolling techniques were used to improve the microstructure and mechanical properties of an Al-1Fe alloy. Al3Fe, Al6Fe and Al3Ce intermetallic phases were found in the RE-modified alloys in the as-cast state. The RE modification refined the alpha-Al grains, resulting in a divorced eutectic and the formation of the Al-Fe phases in the forms of discontinuous networks, flakes and particles. Elemental La dissolved in the Al-Ce phases but did not dissolve in the Al-Fe phases. The dissolution of elemental Ce in the Al-Fe phase along with homogeneous annealing caused the claw-like Al-Fe phases to transform into short flakes and particles, which were. uniformly distributed in the matrix by the rolling processes. A 0.3 wt% RE modification had the optimized effect on the microstructure and mechanical properties, while a 0.4 wt% RE addition resulted in the aggregation of the Al-Ce particles, which then deteriorated the mechanical properties of the alloys.

• 出版日期2015-4-24
• 单位内蒙古工业大学