MICROSTRUCTURE EVOLUTION AND GROWTH BEHAVIORS OF FACETED PHASE IN DIRECTIONALLYSOLIDIFIED Al-Y ALLOYS II. Microstructure Evolution of Directionally Solidified Al-53%Y Peritectic Alloy

doi:10.11900/0412.1961.2015.00620

Acta Metall Sin

2016, Vol. 52

Issue (7): 866-874 DOI: 10.11900/0412.1961.2015.00620

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MICROSTRUCTURE EVOLUTION AND GROWTH BEHAVIORS OF FACETED PHASE IN DIRECTIONALLYSOLIDIFIED Al-Y ALLOYS II. Microstructure Evolution of Directionally Solidified Al-53%Y Peritectic Alloy

Tong LIU¹,Liangshun LUO¹,Yanning ZHANG²,Yanqing SU¹(

),Jingjie GUO¹,Hengzhi FU¹

1 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China. 2 Shenyang Liming Aero-Engine Group Corporation LTD, Shenyang 110043, China.
2 Shenyang Liming Aero-Engine Group Corporation LTD, Shenyang 110043, China.

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Tong LIU,Liangshun LUO,Yanning ZHANG,Yanqing SU,Jingjie GUO,Hengzhi FU. MICROSTRUCTURE EVOLUTION AND GROWTH BEHAVIORS OF FACETED PHASE IN DIRECTIONALLYSOLIDIFIED Al-Y ALLOYS II. Microstructure Evolution of Directionally Solidified Al-53%Y Peritectic Alloy. Acta Metall Sin, 2016, 52(7): 866-874.

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Abstract

Peritectic reaction is frequently encountered in many technologically important materials (e.g., steels, brass, bronze, intermetallic compounds, magnetic materials and YBa₂Cu₃O_x superconductors). Many interesting microstructures have been found during directional solidification of peritectic alloys, which have drawn much attention since last decade. In this work, in order to investigate the growth behavior of Al₃Y phase as a peritectic phase, directioanal solidification experiments at different pulling rates have been performed on Al-53%Y (mass fraction) peritectic alloy. The results show that the primary phase and the peritectic phase both grow continuously, the microstructure, which is parallel to the solid-liquid interface has been found and explained at a low pulling rate (V=1 μm/s). With the growth distance increase, the precipitating solid phase from the liquid at the quenching solid-liquid interface transforms from primary Al₂Y phase to peritectic Al₃Y phase. The interface consists of coarse Al₃Y phase without Al₂Y phase. At relatively high pulling rates, the morphologies of primary Al₂Y phase transit from continuous growth to cellular phase, and further to dendrites with the pulling rate increase. The results also show that the primary phase is enclosed with the serrate peritectic phase, and Al₃Y phase precipitates from the liquid in needle shape at the same time. With the growth distance further increase, Al₃Y phase become thicker and more numerous. In addition, the Al₃Y phase precipitated from liquid transit from needle shape to short rod and lump shape, which distributes around the peritectic structure.

Key words: Al-Y peritectic alloy directional solidification intermetallics compound faceted growth

Received: 03 December 2015

Fund: Supported by National Natural Science Foundation of China (Nos.51425402, 51371066 and 51331005)

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	Tong LIU
	Liangshun LUO
	Yanning ZHANG
	Yanqing SU
	Jingjie GUO
	Hengzhi FU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00620 OR https://www.ams.org.cn/EN/Y2016/V52/I7/866

Fig.1 Low (a) and locally high (b) magnified SEM-BSE images of as-cast Al-53%Y peritectic alloy

Fig.2 OM (a~c) and SEM-BSE (a1~a3, b1~b3, c1~c3) images show the microstructure evolutions of directionally solidified Al-53%Y at pulling rates V=1 μm/s (a, a1~a3), V=5 μm/s (b, b1~b3) and V=10 μm/s (c, c1~c3) under temperature gradient G=20 K/mm (Dash lines in Figs.2a1, b1 and c1 indicate solid/liquid interfaces)

Fig.3 OM (a~c) and SEM-BSE (a1~a3, b1~b3, c1~c3) images show the microstructure evolutions of directionally solidified Al-53%Y at V=20 μm/s (a, a1~a3), V=50 μm/s (b, b1~b3) and V=100 μm/s (c, c1~c3) under G=20 K/mm (Dash lines in Fig.3a1, b1, c1 indicate solid/liquid interfaces)

Fig.4 Partial Al-Y phase diagram with illustration window for banding (a) and the variation in the compositions of liquid with distance showing schematic of the formation of banding microstructure (b) (The composition C_M and C_N refer to the liquid compositions at which nucleation of Al₃Y and Al₂Y, respectively; C_LP refers to the initial composition of peritectic reaction; C₀ refers to initial composition; ΔTNAl2Y and ΔTNAl3Y are nucleation undercoolings required for the Al₂Y and Al₃Y phases, respectively)

Fig.5 Schematic of variation of solute concentration during directional solidification, the solute concentration distribution in sample before directional solidification (a) and the changes of solute concentration after directional solidification for a distance (b) (dx refer to growth distance and dC_L means the solute concentration changes in liquid region after directional solidification for dx length. The composition C_L and C_S refer to the compositions at liquid and solid regions, respectively)

Fig.6 SEM-BSE images of primary Al₂Y in directionally solidified Al-53%Y peritectic alloy at V=1 μm/s (a), V=20 μm/s (b), V=50 μm/s (c) and V=100 μm/s (d) under G=20 K/mm

Fig.7 SEM-BSE images of growth morphologies of Al₃Y in directionally solidified Al-53%Y peritectic alloy (a~d) and Al-15%Y eutectic alloy (e, f) at V=1 μm/s (a), V=20 μm/s (b), V=50 μm/s (c, e) and V=100 μm/s (d, f) under G=20 K/mm

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