Tuning the microstructure and mechanical properties of TiAl-based alloy through grain boundary engineering

Yaodong Xuanyuan; Hongjun Li; Ming Huang; Yinbiao Yan; Sen Yang

Journal of Materials Research and Technology (May 2022)

Tuning the microstructure and mechanical properties of TiAl-based alloy through grain boundary engineering

Yaodong Xuanyuan,
Hongjun Li,
Ming Huang,
Yinbiao Yan,
Sen Yang

Affiliations

Yaodong Xuanyuan: School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China
Hongjun Li: School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China
Ming Huang: School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China
Yinbiao Yan: School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China
Sen Yang: School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China; Jiangsu Key Lab of Micro-Nano Materials and Technology, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing 210094, PR China; Corresponding author.

Journal volume & issue: Vol. 18
pp. 5370 – 5379

Abstract

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In order to modify the room-temperature plasticity of TiAl-based alloy, grain boundary character distribution (GBCD) in TiAl-based alloy was tuned through multidirectional isothermal forging (MDIF) combined with annealing. The experimental results showed that MDIF provided appropriate driving force for the regeneration of the coincidence site lattice (CSL) boundaries through recovery and recrystallization process. Combination of MDIF and annealing at 1100 °C for 90 min promoted the formation of a large number of annealing twins and increased the fraction of low-ΣCSL boundaries to 65.88% and the ratio of (Σ9+Σ27)/Σ3 to 15.12%, which contributed to the disruption of random boundary networks and enhanced the room-temperature plasticity of the TiAl-based alloy.

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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