Characteristics of Al-Si-Fe alloys extruded from rapidly solidified powder
- Chungnam National Univ., Taejon (Korea, Republic of)
Alloys based on Al-xSi-5Fe(x = 12, 16, 18, 25 wt%) was hot extruded from centrifugally atomized powders and variations of microstructures and mechanical properties with silicon content are investigated. Crystallization of primary silicon crystals can be suppressed below 16wt% Si content in centrifugal atomization process and the structures of atomized powders are much finer than that of ingot cast structure. The temperature control of process is necessary to suppress the coarsening of the silicon particles because once coarsened silicon particles can not be broken easily during hot extrusion process. Retard of softening for Al-Si-Fe alloy is maintained below 250 C and it is influenced by coarsening of silicon particles. Tensile strength is improved with increasing of the silicon content up to 18wt% Si but the strength as well as elongation decreases at higher silicon alloy by crack initiation of relatively coarse primary silicon crystals. The presence of hard phases such as primary and eutectic silicon particles and intermetallic compounds improves wear resistance even in the case of higher silicon content up to 25wt% Si.
- OSTI ID:
- 186753
- Report Number(s):
- CONF-950201--; ISBN 0-87339-316-3
- Country of Publication:
- United States
- Language:
- English
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