Grain refinement driven by recrystallization after annealing nonequilibrium solidification microstructure of a deeply undercooled nickel alloy

Xiaolong Xu; Yukang An; Yuhong Zhao; Hua Hou

Journal of Materials Research and Technology (Jul 2023)

Grain refinement driven by recrystallization after annealing nonequilibrium solidification microstructure of a deeply undercooled nickel alloy

Xiaolong Xu,
Yukang An,
Yuhong Zhao,
Hua Hou

Affiliations

Xiaolong Xu: Corresponding author.; School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, Taiyuan 030051, PR China; State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China
Yukang An: School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, Taiyuan 030051, PR China
Yuhong Zhao: School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, Taiyuan 030051, PR China; Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
Hua Hou: Corresponding author.; School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, Taiyuan 030051, PR China; School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, PR China

Journal volume & issue: Vol. 25
pp. 5318 – 5324

Abstract

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Traditional recrystallization technology is based on recrystallization annealing after artificial plastic deformation. In the present study, we found that rapid solidification through deep undercooling can induce substantial plastic deformation and recrystallization. Applying cycle superheating combined with molten glass purification technologies, Ni88Cu6Co6 alloys were highly undercooled to a maximum undercooling of 300 K. Microstructure characteristics and its evolution varying with bulk undercooling during the rapidly solidified process were analyzed. The grain-refined microstructure that appeared at low undercooling regimes was caused by dendrite remelting. The dominant factor of grain refinement microstructure appearing in the high-undercooling regime was recrystallization. It was found that, after annealing rapid solidification microstructure of Ni88Cu6Co6 alloy with a undercooling of 240 K at 1223 K for 12min, the partially recrystallized rapid solidification microstructure was further refined by recrystallization. This study has opened up a new recrystallization technology and is worthy further research.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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