Microstructure of DD5 Single Crystal High-temperature Alloy Prepared via Rapid Solidification Process by Using a Large Module with Dense Array of Seed Crystals

doi:10.11901/1005.3093.2024.498

Chinese Journal of Materials Research

2026, Vol. 40

Issue (1): 13-22 DOI: 10.11901/1005.3093.2024.498

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Microstructure of DD5 Single Crystal High-temperature Alloy Prepared via Rapid Solidification Process by Using a Large Module with Dense Array of Seed Crystals

LIU Jiabao¹^,², GAO Xuefeng², ZHANG Haoyu², WANG Liang², WANG Yanhui³, YUE Xiangang³, MENG Jie²(

), LI Jinguo², ZHOU Yizhou²(

)

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Shenyang Liming Aero-Engine (Group) Corporation Ltd., Shenyang 110043, China

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LIU Jiabao, GAO Xuefeng, ZHANG Haoyu, WANG Liang, WANG Yanhui, YUE Xiangang, MENG Jie, LI Jinguo, ZHOU Yizhou. Microstructure of DD5 Single Crystal High-temperature Alloy Prepared via Rapid Solidification Process by Using a Large Module with Dense Array of Seed Crystals. Chinese Journal of Materials Research, 2026, 40(1): 13-22.

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Abstract

The DD5 single crystal high-temperature alloy rods were massively prepared via high-speed solidification process by using a large module with dense array of seed crystals. At the same time, graphite insulation rods were appropriately inserted in between the seed crystals so that to optimize the temperature field distribution in the solidification chamber. Then, the solidification microstructure of the prepared single crystal alloys was carefully examined by means of optical microscopy, scanning electron microscopy and electron probe microanalysis, whilst the numerical simulation of the temperature field of solidification chamber was conducted as well. The results showed that, compared with the module without insulation of graphite rods, the initial dendrite spacing of the single crystal rods prepared by the modified module was reduced from 497 μm to 378 μm, and the γ/γ' eutectic phase was refined. The volume fraction of the eutectic phase decreased from 7.0% to 4.7%, the degree of segregation of elements such as W, Re, Al and Ta, and the average size of the γ' phase in the core of the dendrite and between the dendrites were reduced, and the size of the γ' phase between the core and the dendrite tended to be consistent. This indicates that the modified module can increase the temperature gradient during the high-speed solidification process and improve the uniformity of the temperature field of solidification chamber during the single crystal solidification process, which is conducive to maintaining a straight solid-liquid interface during single crystal solidification and making the solidification microstructure much uniform and dense.

Key words: metallic materials single crystal superalloy large module dense array structure temperature field solidification structure

Received: 16 December 2024

ZTFLH:

TG132.3+2

Fund: Postdoctoral Fellowship Program of CPSF(GZC20232739)

Corresponding Authors: MENG Jie, Tel: 18842323031, E-mail: jmeng@imr.ac.cn;
ZHOU Yizhou, Tel: (024)83978068, E-mail: yzzhou@imr.ac.cn

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	Articles by authors
	LIU Jiabao
	GAO Xuefeng
	ZHANG Haoyu
	WANG Liang
	WANG Yanhui
	YUE Xiangang
	MENG Jie
	LI Jinguo
	ZHOU Yizhou

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.498 OR https://www.cjmr.org/EN/Y2026/V40/I1/13

Table 1 Nominal composition of DD5 alloy (mass fraction, %)

Fig.1 Schematic diagrams of ceramic molds (a) without insulation material, (b) with insulation material

Table 2 Model parameters for solidification modelling

Fig.2 Simulated and experimentally measured temperature curves with time

Fig.3 Simulated temperature fields of two types of modules (a) mold without center pillar, (b) mold with graphite center pillar

Fig.4 Simulation results of the paste like zone of two types of modules (a) mold without center pillar, (b) mold with graphite center pillar

Fig.5 Cross sectional microstructure of single crystal poured in the arrangement multiple module without insulation material (a) outer, (b) inner

Fig.6 Statistics of primary dendrite spacing at different height positions of inner and outer DD5 single crystal rods poured in the arrangement multiple module without insulation material

Fig.7 Eutectic microstructure morphology of DD5 alloy test bars cast in the arrangement multiple module without insulation material (a) outer, (b) inner

Fig.8 Segregation coefficients of various elements in single crystals poured in the arrangement multiple module without insulation material

Fig.9 Single crystal dendrite dry and interdendritic γ' phase morphology cast in the arrangement multiple module without insulation material (a) outer dendrite core, (b) outer interdendritic, (c) inner dendrite core, (d) inner interdendritic

Fig.10 Single crystal cross-sectional microstructure cast in the arrangement multiple module with insulation material (a) outer, (b) inner

Fig.11 Statistics of primary dendrite spacing at different height positions of single crystals cast by different types of module (a) outer, (b) inner

Fig.12 Eutectic microstructure morphology of DD5 alloy test bars cast in the arrangement multiple module with insulation material (a) outer, (b) inner

Fig.13 Segregation coefficients of various elements in single crystals cast by two types of modules

Fig.14 γ' phase morphology of the inner single crystal cast in the arrangement multiple module with insulation material (a) outer, (b) inner

Fig.15 Statistics of the average size of the γ' phase in single crystals cast by two types of modules (a) outer, (b) inner

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