Phase and Microstructure Selection During Directional Solidification of Peritectic Alloy Under Convection Condition

doi:10.1007/s40195-014-0096-5

Abstract

Abstract:

A phase and microstructure selection map used for peritectic alloy directionally solidified under convection condition was presented, which is based on the nucleation, constitutional undercooling criterion (NCU criterion), and the highest interface temperature criterion. This selection map shows the relationships between the phase/microstructure, the G/V ratio (G is the temperature gradient, V is the growth velocity), and the alloy composition under different convection intensities and nucleation undercoolings. Comparing with the results from directional solidification experiments of Sn–Cd peritectic alloys, this selection map was generally in agreement with the experimental results.

Key words: Directional solidification, Phase and microstructure selection, Melt convection, Sn–Cd peritectic alloy

Lingshui Wang, Jun Shen, Yilong Xiong, Yujun Du, Hengzhi Fu. Phase and Microstructure Selection During Directional Solidification of Peritectic Alloy Under Convection Condition[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 585-592.

Figures/Tables 6

Fig. 1 Sn–Cd peritectic alloy phase diagram a, phase and microstructure selection map at ΔTα = ΔTβ = 0 K and Δ = 1.3 b

Table 1 Parameters of Sn–Cd peritectic alloy [16–20]

Phase	m_L	k₀	D_L (m²/s)	C_P (wt%)
α	-2.37	0.16	3 × 10^-9	3.8
β	-1.43	0.25	3 × 10^-9	3.8

Fig. 2 Phase and microstructure selection maps at different Δ and ΔTα = ΔTβ = 0 K

Fig. 3 Phase and microstructure selection maps at different undercoolings and Δ = 1.3

Fig. 4 Quenched interfaces correspond to the points a–k in Fig. 5a–k, banded structures correspond to point a–f in Fig. 5a1–f1, gray phase is primary α phase, black phase is peritectic β phase

Fig. 5 Comparison between experimental results and the selection map

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