The disorder-order transformation of C-Al(Mn, Fe)Si phase
- Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics
- Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Engineering Metals
The quaternary phase of Al-Mn-Fe-Si is the main precipitated phase in alumina fibre reinforced aluminium alloy matrix composites. It has been reported that the C-Al(Mn, Fe)Si phase has a cubic cell, a [equals] 1.263 nm, and consists of 61.4 wt.%Al, 15.7 wt.%Mn, 16.1 wt.%Fe and 6.8 wt.%Si. It has been suggested that the quaternary phase is isomorphous with [alpha]-AlFeSi and [alpha]-AlMnSi. No further information about this phase has been reported. From visually estimated X-ray intensities, however, Cooper et al. concluded that the space group of the [alpha]-AlMnSi phase was Pm3, but the [alpha]-AlFeSi phase was Im3. Therefore, the crystal structure of C-Al(Mn, Fe)Si needs further investigation. The investigation material was a [delta]-Al[sub 2]O[sub 3] fibre reinforced Al-Mg-Si-Mn-Fe matrix composite. The material contained 1.27 wt.%Mg, 0.86 wt.%Si, 0.54 wt.%Mn, 0.18 wt.%Fe and the rest was Al. The authors produced the composite, using a pressure infiltration method in a squeeze-casting apparatus. Then it was solution-treated at 530 C for 24 hours. The crystal structure and the composition of the C-Al(Mn, Fe)Si phase before and after heat treatment were investigated with a JEOL 2000 FX analytical electron microscope, equipped with the AN10000 EDS analysis system. The authors made the TEM samples by ion milling.
- OSTI ID:
- 5985704
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 29:7; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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