Abstract
The aim of present research was to investigate the hot tearing susceptibility (HTS) of SiC reinforced Al5Cu matrix composites. The HTS value of Al5Cu was 19.3, and the HTS values were 6.14, 16.05 and 44.98, corresponding to 0.5SiC/Al5Cu, 1SiC/Al5Cu and 2SiC/Al5Cu, respectively. The results indicated that the serious HTS of Al5Cu was obviously improved when the content of SiC particle was less than 1%, especially 0.5% SiC. Grain size and solidification temperature range were two significant factors for the HTS. For composites, SiC served as effective heterogeneous nucleation cores obviously increased the grain refining efficiency. The grain size was 55.24 μm for Al5Cu, the grain size of composites decreased to 42.77 μm (0.5SiC/Al5Cu), 36.19 μm (1SiC/Al5Cu) and 37.42 μm (2SiC/Al5Cu). Solidification temperature range of Al5Cu alloy was 110.49 °C. Compared with Al5Cu matrix alloy, the solidification temperature rang decreased for 0.5SiC/Al5Cu (108.54 °C) and 1SiC/Al5Cu (109.42 °C), but the 2SiC/Al5Cu had large solidification temperature range of 111.99 °C. The HTS improvement was mainly attributed to the refined grain and shortened solidification temperature range, which increased the residual liquid metal feeding property and decreased the shrinkage strain. In addition, the HTS mechanism of composites was discussed in detail.
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