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- Title
Formation of hypoeutectic microstructure in a rapidly solidified Al–5 wt-%Sr alloy.
- Authors
Zhang, Z.-H.; Bian, X.-F.; Wang, Y.
- Abstract
The microstructure and thermal analysis of the melt spun Al-5 wt-%Sr alloy have been investigated using X-ray diffraction, TEM, and differential scanning calorimetry (DSC). The experimental results show that rapid solidification makes the eutectic composition shift to a higher Sr content exceeding 5 wt-%Sr. The microstructure of the melt spun Al-5Sr alloy is hypoeutectic and composed of primary α-Al cells and the α-Al/Al[sub 4]Sr eutectic; quite different from that of the ingot like alloy comprising coarse primary Al[sub 4]Sr phase embedded in the eutectic. In the melt spun Al-5Sr alloy, some areas comprise equiaxed or elongated α-Al cells with intercellular irregular α-Al/Al[sub 4]Sr eutectic. Moreover, some areas fully comprise coupled α-Al/Al[sub 4]Sr eutectic. The eutectic Al[sub 4]Sr phase is lamellar strip like or vermiform in morphology. The size of the eutectic Al[sub 4]Sr phase is less than 50 nm in width. Furthermore, the very fine microstructure of the melt spun Al-5Sr alloy has a marked effect on the DSC trace in heating process.
- Subjects
MICROSTRUCTURE; ALLOYS; THERMAL analysis; X-ray diffraction; EUTECTIC alloys
- Publication
Materials Science & Technology, 2003, Vol 19, Issue 6, p791
- ISSN
0267-0836
- Publication type
Article
- DOI
10.1179/026708303225002857