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1 Archives of Materials Science and Engineering

1 2008

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Soldification curves structure of heterophase composite

Dolata-Grosz A., Dyzia M., Śleziona J.

Archives of Materials Science and Engineering

2008

Vol. 29, nr 1

10-15

Purpose: This paper presents results of solidification tests for homo- and heterophase composites. Researches concerned influence of reinforcement particle for solidification process of composite materials . Curves of solidification composite reinforced with (Al2O3) and heterophase reinforcement (mixture of Al2O3 particles +glassy carbon) were compared with aluminium alloy matrix (AlSi12CuNiMg2). Based casting spiral test the castability of composite were put to the test. Also macro and microstructure ingots after solidification on equal thermal conditions were presented. Design/methodology/approach: Solidification process was recorded with 0.4 sec. period by analog-digital converter connected to PC. Temperature was controlled by K thermocouple (NiCr-Ni) installed in standardized thermoelectric cup core QC4080. That equipment made possible to realised solidification tests on the equal thermal conditions. The castability was tested on standard spiral duct formed at self hardening phosphate mould. Findings: Results of researches confirm influence of glassy carbon on solidification of composite suspension. Compared to aluminium oxide particles (Al2O3) glassy carbon accelerate solidification process of composite material. Probably, it results from disparate properties of glassy carbon. Practical implications: Glassy carbon particles change characteristics of composite crystallization and decrease shrinkage of the casting. Moreover application of mixture of Al2O3 and glassy carbon as heterophase reinforcement allows to segregation and sedimentation particles in the matrix and it guides in results of solidification to gradient structure of composite material. Originality/value: Employment of heterophase reinforcement allows to get segregation and sedimentation in the matrix, which results in the occurrence of a gradient structure.