MICROSTRUCTURE EVOLUTION AND GROWTH BE-HAVIORS OF FACETED PHASE IN DIRECTIONALLY SOLIDIFIED Al-Y ALLOYS I. Microstructure Evolution of Directionally Solidified Al-15%Y Hypereutectic Alloy

doi:10.11900/0412.1961.2015.00619

Acta Metall Sin

2016, Vol. 52

Issue (7): 859-865 DOI: 10.11900/0412.1961.2015.00619

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MICROSTRUCTURE EVOLUTION AND GROWTH BE-HAVIORS OF FACETED PHASE IN DIRECTIONALLY SOLIDIFIED Al-Y ALLOYS I. Microstructure Evolution of Directionally Solidified Al-15%Y Hypereutectic Alloy

Liangshun LUO¹(

),Tong LIU¹,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

Cite this article:

Liangshun LUO,Tong LIU,Yanning ZHANG,Yanqing SU,Jingjie GUO,Hengzhi FU. MICROSTRUCTURE EVOLUTION AND GROWTH BE-HAVIORS OF FACETED PHASE IN DIRECTIONALLY SOLIDIFIED Al-Y ALLOYS I. Microstructure Evolution of Directionally Solidified Al-15%Y Hypereutectic Alloy. Acta Metall Sin, 2016, 52(7): 859-865.

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Abstract

The intermetallic compound has been widely introduced in alloys as a reinforced phase due to its high strength, high hardness and enhanced heat stability. The size, morphology, distribution and volume fraction of these intermetallic compounds affect the mechanical properties of materials significantly. In this work, the microstructures evolution and growth behoviors of primary intermetallic Al₃Y phase have been investigated in directionally solidified Al-15%Y (mass fraction) hypereutectic alloy at a wide range of pulling rates (1~100 μm/s). The as-cast Al-15%Y alloy is composed of primary intermetallic Al₃Y phase and Al₃Y/Al eutectic structure. At relatively low pulling rates (1~5 μm/s), primary Al₃Y phase exhibits irregular and having a branching structure on the top of the specimens. Primary Al₃Y phase also precipitates in a faceted growth with sharp edges and corners. As the pulling rate increases, the morphologies of Al₃Y phase transit to elongated prism. Al₃Y phase distributes dispersively in the eutectic structure at a higher pulling rate, presenting a crossing shape with two prisms crossed vertically. Further increasing the growth rate to 100 μm/s, the cross morphology such as two six prismatic vertical cross structure of primary Al₃Y appear, similar to the growth in the form of dendrites. During the increase of pulling rates, the leading-phase at solid-liquid interface appear gradually, and the growth distance of primary phase increases with the pulling rates increase.

Key words: Al-Y hypereutectic alloy directional solidification intermetallic compound Al3Y microstructure evolution

Received: 03 December 2015

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

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

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00619 OR https://www.ams.org.cn/EN/Y2016/V52/I7/859

Fig.1 Schematic of the Bridgman solidification furnace used in the present work

Fig.2 Low (a) and locally high (b) magnified SEM-BSE images of as-cast Al-15%Y hypereutectic alloy

Fig.3 Low (a~c) and locally high (a1~a3, b1~b3, c1~c3) magnified OM images show the microstructure evolutions of directionally solidified Al-15%Y hypereutectic alloy at pulling rates V=1 μm/s (a, a1~a3), V=3 μm/s (b, b1~b3), V=5 μm/s (c, c1~c3) under temperature gradient G=20 K/mm (Dash lines in Figs.3a1, b1, c1 indicate solid/liquid interfaces)

Fig.4 Low (a~c) and locally high (a1~a3, b1~b3, c1~c3) magnified OM images show the microstructure evolutions of directionally solidified Al-15%Y hypereutectic alloy at V=10 μm/s (a, a1~a3), V=20 μm/s (b, b1~b3), V=100 μm/s (c, c1~c3) under G= 20 K/mm (Dash lines in Figs.4a1, b1, c1 indicate solid/liquid interfaces)

Fig.5 Low (a) and locally high (b) magnified OM images of transverse sections of Al-15%Y hypereutectic alloy at V=20 μm/s and G=20 K/mm

Fig.6 OM images of the solid/liquid interfaces in directionally solidified Al-15%Y hypereutectic alloy at V=1 μm/s (a), V=3 μm/s (b), V=5 μm/s (c), V=10 μm/s (d), V=20 μm/s (e) and V=100 μm/s (f) under G=20 K/mm (Dash lines indicate solid/liquid interfaces)

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

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