Columnar-to-Equiaxed Transition in Metal-Matrix Composites Reinforced with Silicon Carbide Particles

Table 1

Liquidus temperature (𝑇_𝐿), solidus temperature (𝑇_𝑆), cooling rate in the liquid (𝑇̇_𝐿), cooling rate in the solid (𝑇̇_𝑆), liquidus interphase velocity (𝑉_LC), minimum CET position (CET_MIN.), maximum CET position (CET_MAX.), critical gradients (𝐺_𝐶), and recalescence values (𝑅) obtained from the temperature versus time curves.

Experiment number	Alloy and composite	𝑇𝐿; (K)	𝑇𝑆; (K)	𝑇̇𝐿; (K/s)	𝑇̇𝑆; (K/s)	𝑉LC; (K/s)	CETMIN.; (mm)	CETMAX.; (mm)	𝐺𝑐; (K/mm)	𝑅; (°C)
1	Zn-27 wt.% Al (ZA27)	778.2	709.7	3.3	1.1	1.05	35	87	−0.09	2.4
2	Zn-27 wt.% Al (ZA27)	778.2	709.7	2.2	0.8	1.4	21	44	0.06	1.1
3	ZA27 + 5vol% SiC	767.8	710.2	2.8	0.9	1.2	26	48	−3.89	2.3
4	ZA27 + 5vol% SiC	767.8	710.2	3.4	1.0	2.4	41	63	−1.52	2.5
5	ZA27 + 8vol% SiC	762.3	706.7	3.1	1.0	1.6	31	46	−1.55	2.9
6	ZA27 + 8vol% SiC	762.3	706.7	2.3	0.8	1.35	21	43	−1.1	3.5
7	ZA27 + 16vol% SiC	759.1	703.5	3.4	1.0	1.85	39	54	−2.49	1.3
8	ZA27 + 16vol% SiC	759.1	703.5	2.1	0.8	0.9	17	43	−1.01	3.0