The diffusion growth of intermetallic compounds in Al-Er alloys are closely related to the properties of the alloys.The current work aims at explaining the dominance of Al3Er in the Al-Er alloys precipitation phases and the interface thin layer phenomenon by diffusion couple technique, estimating the parabolic growth constant iphone 13 price dallas and diffusion activation energy of intermetallic compound in Al-Er diffusion couples to provide theoretical guidance for the design of new Al-Er alloys.In this work, Al-Er diffusion couples were successfully prepared by casting-cladding method in the atmosphere.
The growth of Al-Er intermetallic compounds at diffusion couple interface during annealing were observed and recorded by High-Temperature Laser-Scanning Confocal Microscopy at 673, 698, 723 and 748 K respectively.The results show that the growth characteristics of Al-Er intermetallic compounds were accord with layer-terraced growth during annealing.The thickness of intermetallic compound was linear with the square rosy teacup dogwood root of time at experimental temperature.
The intermetallic compound layer was composed of Al3Er and a very thin AlEr phase.The parabolic growth constants of Al3Er phase at 673, 698, 723 and 748 K were 1.017 × 10−14, 1.
609 × 10−14, 3.111 × 10−14 and 4.76 × 10−14 respectively.
The activation energy of Al3Er phase was (88.4 ± 5.3) kJ/mol and the pre-exponential factor was 7.
126 × 10−8 m2/s.